1. Reliability Testing of Automotive Sensors
Core Function: Verify performance stability of sensors under extreme temperature conditions, screen defective products, and ensure driving safety.
Specific Applications:
Temperature cycle test: Simulate engine compartment temperature fluctuations of -40℃~150℃ to test sensor signal accuracy and response speed.
High-temperature aging: Sustained 500–1000 hours at a constant temperature of 100–150℃ to accelerate material aging and evaluate long-term reliability.
Damp-heat test: 1000-hour test under 85℃/85% RH environment to verify moisture resistance and circuit stability.
Case: An ABS wheel speed sensor manufacturer adopted precision ovens for high-temperature aging with temperature control accuracy of ±0.3℃, ensuring product detection accuracy of ±0.1km/h and significantly improving overall vehicle safety performance.
2. Curing and Drying of Automotive Electronic Components
Core Function: Ensure firm soldering of electronic components, remove moisture, enhance insulation, and improve product reliability.
Key Applications:
PCB solder paste curing: Precise temperature control at 80–120℃ to ensure uniform and firm soldering and prevent cold solder joints/short circuits.
Electronic module sealing: Curing of sensor potting adhesive to ensure waterproof and dustproof performance.
Wire harness insulation treatment: Remove moisture and enhance insulation to prevent circuit failures.
Case: A vehicle ECU manufacturer used fully sealed precision ovens with temperature control accuracy of ±0.5℃, ensuring stable operation of electronic components under high-temperature and high-humidity conditions and reducing product failure rate by 40%.
3. Aging and Performance Testing of Rubber Seals
Core Function: Evaluate heat resistance of rubber materials, predict service life, and prevent leaks and malfunctions caused by seal failure.
Key Applications:
Hot air aging test: 7–90 days of testing at 70–200℃ to measure hardness change, tensile strength retention rate, and compression set.
Heat resistance evaluation of O-rings/gaskets: Verify temperature resistance of FKM and other materials in fuel systems.
Seal strip aging resistance: 168-hour test of automotive door and window seal strips at 100℃±2℃ to ensure long-term sealing performance.
Case: An automotive engine seal manufacturer used precision ovens for aging tests with temperature uniformity of ±1℃, accurately evaluating material service life and reducing engine oil leakage failure rate by 60%.
4. Coating Curing of Automotive Parts
Core Function: Ensure uniform coating curing, enhance adhesion, wear resistance, and corrosion resistance.
Key Applications:
Headlight cover UV coating curing: 2-hour constant temperature at 80℃ to ensure coating hardness and transparency.
Brake pad adhesive curing: Curing at 150–200℃ to ensure firm bonding between friction materials and back plates.
Automotive wheel hub spray coating curing: Ensure uniform and firm coating to improve appearance and durability.
Case: An automotive lamp manufacturer adopted precision tunnel ovens for UV coating curing with temperature uniformity of ±1℃, increasing production capacity by 50% while ensuring compliance of product light transmittance and hardness.
5. Heat Treatment of Automotive Metal Parts
Core Function: Improve metal microstructure, enhance strength, toughness, and wear resistance to meet stringent requirements of automotive parts.
Key Applications:
Aging annealing of aluminum alloy die castings: 150–250℃ to eliminate internal stress and improve dimensional stability and strength.
Heat treatment of bearings/gears: Improve material microstructure to enhance wear resistance and fatigue strength.
Spring tempering: Precise temperature control to ensure stable elastic performance.
6. Other Key Applications
Interior part shaping: Softening and shaping of seat/instrument panel leather at controlled temperatures to ensure aesthetics and durability.
Composite material processing: Hot-press forming of carbon fiber components to ensure material strength and stability.
Automotive tire production: Preheating before tire vulcanization to ensure molding quality and uniformity.
The glove-type high-low temperature test chamber is a key equipment for environmental reliability testing in electronics, automotive, aerospace and other fields. With the core advantages of "sealed isolation + precise temperature control + convenient operation", it has become an ideal solution for sample testing under extreme temperatures. Its core features can be summarized in the following six dimensions.
I. Wide-Range and Precise Temperature Control, Adapting to Diverse Testing Needs
The equipment has a wide temperature range. Conventional models can simulate extreme environments from -70℃ to +150℃, and customized models can expand the temperature range to adapt to high and low temperature resistance testing of various products. It adopts PT100 platinum resistance sensor and PID high-precision control algorithm, with temperature fluctuation ≤±0.5℃ and uniformity ≤±2.0℃, ensuring accurate test data; the heating rate is 1.0-3.5℃/min and the cooling rate is 0.7-1.2℃/min, which can quickly switch temperatures and improve test efficiency.
II. Sealed Glove Operation, Ensuring Test Continuity and Safety
The chamber is equipped with a sealed operation port and high-sealing silica gel gloves to form an isolated test environment. Operators can real-time complete sample testing, status observation and other operations through the gloves without interrupting the test, avoiding temperature and humidity fluctuations caused by opening and closing the door, and improving data reliability; at the same time, it blocks the impact of extreme temperature inside the chamber on the outside, prevents external impurities from entering, and ensures environmental cleanliness and operator safety.
III. Intelligent and Convenient Operation, Improving Test Efficiency
The equipment is equipped with a large-screen touch screen controller, supporting Chinese-English bilingual switching and intuitive operation. The controller can preset 100 groups of processes, 50 steps/group of test procedures, and support 250 cycles of testing, meeting the needs of alternating temperature testing; it is equipped with USB and network communication functions, which can real-time export data, print curves and remote monitoring operations, facilitating data traceability and management; some models are equipped with test holes, which can be connected to external power supplies to realize live sample testing and expand application scenarios.
IV. Stable Structural Design, Ensuring Long-Term Stable Operation
The chamber adopts a double-layer composite structure. The outer shell is made of A3 steel plate with electrostatic spraying, which is corrosion-resistant and durable; the inner tank is made of SUS304 mirror stainless steel, which is high-temperature resistant and easy to clean; the middle is filled with 100mm high-density glass fiber cotton insulation layer, which is heat-insulating and energy-saving. The chamber door is equipped with double-layer high-temperature resistant sealing strips and hollow tempered glass observation window. The observation window is equipped with conductive film heating defrosting function, taking into account both sealing and observation needs. The refrigeration system adopts fully enclosed unit and environmentally friendly refrigerant, with forced air cooling, stable operation and low noise. It has passed 48-hour air pressure leak test to ensure stability and reliability.
V. Comprehensive Safety Protection, Reducing Test Risks
The equipment is built with multiple safety protection mechanisms, including over-temperature protection, refrigeration system overload and over-pressure protection, phase loss/phase reversal protection, leakage protection, water shortage protection, etc. It is equipped with three-color indicator lights to real-time display operation, standby and fault status. When a fault occurs, it will automatically shut down and prompt the cause, facilitating troubleshooting. The heating and refrigeration systems are independently designed to avoid interference, which not only improves temperature control accuracy, but also reduces the impact of single system failure on the test, ensuring equipment operation and sample safety.
VI. Compliance with Authoritative Standards, Adapting to Multi-Industry Needs
The product strictly complies with national and international standards such as GB/T2423.1-2008, GB/T2423.2-2008 and IEC60068. It is widely used in electronics, electrical engineering, automotive, aerospace, biomedicine, building materials and other fields. It can complete high and low temperature and constant temperature performance testing of materials and products, providing support for product design improvement and quality verification.
In summary, with the core advantages of precise temperature control, sealed operation, intelligence and convenience, and stability and reliability, the glove-type high-low temperature test chamber solves the pain points of dynamic testing under extreme temperatures. It is a key equipment for environmental reliability testing in multiple industries and provides solid guarantee for product quality improvement.
1. Refrigeration System Protection
- Compressor Overpressure Protection: Real-time monitors compressor internal pressure. Automatically triggers protection when pressure exceeds the safety threshold to avoid overpressure damage and ensure stable refrigeration system operation.
- Compressor Overheating Protection: Equipped with overheating detectors to sense compressor operating temperature. Immediately cuts off the circuit when overheated to prevent winding burnout and extend equipment service life.
- Compressor Overcurrent Protection: Monitors compressor current via a detection module. Rapidly cuts off power when current is abnormally high to avoid damage to the compressor and related electrical components.
- Refrigerant Pressure and Overload Protection Device: Monitors refrigerant circulation pressure to prevent system damage from leakage or abnormal pressure; protects against refrigeration system overload to ensure safe operation.
2. Test Chamber Protection
- Adjustable Overtemperature Protection: Flexibly sets overtemperature thresholds to adapt to different samples' temperature tolerance. Triggers protection promptly when the test chamber temperature reaches the set threshold.
- Three-Layer High-Temperature Overtemperature Protection: Hierarchical design: 1) Basic overtemperature protection linked with test control logic; 2) Electronic device for fast response; 3) Ultimate barrier to cut off heat source under extreme high temperature, ensuring sample and equipment safety.
- Fan Motor Overcurrent Protection: Provides overcurrent protection for circulating fan motor. Cuts off power quickly when current exceeds standard due to abnormal load or jamming to prevent burnout and ensure normal temperature uniformity circulation.
- Fault Abnormality Protection: Monitors equipment operation. Cuts off control power immediately to prevent fault expansion when abnormalities (e.g., temperature runaway, motor failure) occur; outputs fault indication and alarm signals for quick troubleshooting.
- Active Water Shortage Prompt: Equipped with water level sensor. Issues acousto-optic prompt when water level is too low, reminding timely replenishment to avoid test disruption or humidification component damage.
- Dynamic High and Low Temperature Protection: Intelligent adaptive adjustment. Dynamically modifies protection values according to test temperature curve to ensure test smoothness and intervene promptly in abnormal temperature fluctuations, improving safety and accuracy.
3. Other Protections
- Main Power Phase Sequence and Phase Loss Protection: Monitors power phase sequence and phase presence. Cuts off main power immediately on phase sequence error or loss to prevent motor reversal and electrical component burnout, ensuring overall electrical safety.
- Short Circuit Protection: Equipped with short circuit protectors. Fuses or trips quickly to cut off fault circuit when short circuit occurs, avoiding fires and equipment damage.
- Leakage/Surge Prevention Protection: Multi-layer design: leakage circuit breaker ensures operator safety; FUSE and RC electronic components suppress grid surges, protecting precision electronic parts.
- Controller Internal Automatic Detection Protection: Real-time detects core temperature/humidity sensor. Triggers protection and fault prompt on sensor abnormality to avoid test deviation or equipment misoperation.
- Water Cutoff and Dry Burning Protection: Dual protection: prevents humidification system damage from water cutoff idling; avoids electric heating component burnout in water-free state, ensuring humidification and heating system safety.
- Expansion Protection Device: Reserves two fault detection input interfaces for additional protection components or upgrades, enhancing system expandability and adaptability.
Summary
The test chamber's safety protection devices form a comprehensive, multi-level system covering refrigeration, test chamber and electrical systems. Integrating real-time monitoring, early warning and rapid response, they effectively prevent equipment damage from abnormalities (overpressure, overheating, etc.), protect samples and operators. Reserved expansion interfaces enhance flexibility and adaptability, ensuring stable, safe and reliable operation under various conditions.
The three-zone thermal shock test chamber is core equipment for simulating extreme temperature change environments. Its stability directly affects test data accuracy and service life. Daily maintenance shall target fault prevention, precision assurance and service life extension, focusing on the upkeep of key systems. Key points are as follows:
I. Daily Maintenance Key Points for Core Systems
1. Refrigeration System: Ensure Cooling Efficiency & Operational Safety
Check the refrigerant pressure gauge weekly to maintain pressure within the calibrated range (high pressure: 0.8–1.2 MPa; low pressure: 0.1–0.3 MPa). Troubleshoot leaks promptly if abnormalities are detected.
Clean condenser fins monthly: Use compressed air (≤0.4 MPa) to blow dust from inside to outside for air-cooled models; ensure clean, scale-free cooling water and inspect cooling towers/filters regularly for water-cooled models.
Inspect the smooth operation of solenoid valves and expansion valves quarterly. Disassemble and clean valve cores if jamming occurs.
2. Heating System: Ensure Uniform Heating & Electrical Safety
Check heating tube terminals and measure insulation resistance (≥2 MΩ) daily before testing to prevent electric leakage or uneven heating.
Test SSR output voltage with a multimeter monthly.
Disassemble the heating chamber semi-annually to remove debris and carbides, ensuring efficient heat transfer.
3.Water Circuit & Sealing System: Maintain Circulation Stability & Temperature Field Sealing
Replace deionized water in the circulation tank weekly and keep the water level ≥ 2/3 of the tank volume.
Dismantle filter cartridges monthly, soak in 5% citric acid for 30 minutes, and rinse to remove scale.
Inspect door seals daily, wipe clean with alcohol cotton, and replace immediately if damaged.
4. Mechanical & Electrical Systems: Ensure Smooth Switching & Precise Control
Lubricate sample rack slides monthly with high-temperature grease (-40℃~200℃ resistance) and tighten door hinges/latches.
Calibrate air damper switching mechanisms quarterly, fasten distribution box terminals, and measure grounding resistance (≤4 Ω).
Wipe the control panel with a dry cloth daily; avoid corrosive solvents.
II. Periodic Maintenance Specifications
Daily/Post-test: Clean residues and moisture in the test chamber; inspect drain pipes; verify intact door seals and clear space around the equipment.
Weekly/Monthly: Check refrigeration system pressure and clean condensers; inspect heating system electrical connections; replace tank water and clean filters.
Quarterly/Semi-annually: Calibrate temperature sensors and controllers (error ≤±0.5℃); remove impurities from air ducts and fans; test sensitivity of safety devices (over-temperature protection, leakage protection, etc.).
Annual Maintenance: Performed by professional engineers, including refrigeration pipeline leak detection, compressor oil inspection, heating element testing, and full-system metrological calibration.
III. Critical Precautions
Power off and cool the chamber to room temperature before maintenance to avoid high-temperature/high-pressure hazards. Contact suppliers for professional operations (refrigerant refilling, sensor calibration, etc.).
Place the equipment in a well-ventilated area with ≥1m heat dissipation space around it; keep away from heat sources, water sources and dust; ensure stable power supply voltage.
Sample loading capacity ≤ 1/3 of the working chamber volume to prevent air duct blockage. Drain the water tank if the equipment is idle for over 1 month; power on monthly for 1 hour to prevent moisture buildup.
Establish a maintenance log to record upkeep details and troubleshooting measures, supporting the full-life cycle management of the equipment.
Systematic maintenance as above can reduce failure rates by over 60%, extend service life by 3-5 years, ensure reliable test data, and support product environmental adaptability testing.
In industrial manufacturing and R&D, "environmental adaptability" is a core product quality indicator. High-precision sectors like electronics, automotive, and aerospace demand exceptional product stability under severe temperature fluctuations. The three-chamber thermal shock chamber, a professional tool for simulating extreme temperature changes, has become essential for enterprises to ensure product reliability. This article analyzes this key testing equipment.
I. What is a Three-Chamber Thermal Shock Chamber?
A three-chamber thermal shock chamber conducts thermal shock tests by rapidly switching between high and low temperature environments. Its core is the independent "high-temperature + low-temperature + test chamber" structure, which enables faster temperature changes and precise control compared to two-chamber designs (shared high-low temperature chamber), avoiding transitional temperature interference and replicating real extreme conditions.
Key parameters: temperature range (-40℃~150℃ for high-temp chamber, -60℃~ambient for low-temp), shock rate (>10℃/s max), test chamber volume, and temperature uniformity (≤±2℃). These are customizable per industry standards.
II. Core Working Principle: Rapid Temperature "Energy Switching"
Its operation relies on "independent temperature control + rapid switching", with four key steps:
1. Zoned Control: High-temp chamber uses electric heating/hot air; low-temp chamber uses liquid nitrogen/cascade refrigeration. Both employ independent closed-loop control for stability.
2. Sample Placement: Sample is placed on a movable rack in the ambient-temperature test chamber initially.
3. Shock Cycle: Rack moves sample between high/low-temp chambers per program, simulating "high-low-high" cycles.
4. Data Monitoring: Built-in sensors record real-time temperature and sample performance for analysis.
Compared to two-chamber models, it eliminates temperature balance time (boosting efficiency by 30%+), avoids cross-contamination, and ensures more reliable results.
III. Core Advantages: Precision, Efficiency, and Stability
- Extreme Temp Range: -60℃~180℃, 15℃/s max rate, simulating plateaus/polar/aviation conditions.
- Precise Control: No temperature gradient; uniform heating/cooling, repeatability error ≤±1℃.
- High Efficiency: No chamber transition waits, ideal for batch sample screening.
- Wide Applicability: Suitable for electronics, automotive parts, aerospace components.
IV. Typical Application Scenarios: Full-Link Coverage from Laboratory to Production Line
Its core role is early defect detection, covering R&D, sampling, and quality tracing. Key applications focus on high-reliability industries:
1. Electronics and Electrical Industry: "Extreme Test" for Components
Electronic components (chips, capacitors, PCBs) face frequent temperature changes. This test reveals thermal expansion/contraction defects (solder cracks, package aging). For example, 5G base station chips undergo 1,000 cycles at -40℃~85℃ for climatic adaptability.
2. Automotive Industry: "Environmental Adaptability Verification" for Vehicles and Parts
Automobiles endure -30℃~40℃ cross-regional temp swings, demanding durable components. The chamber tests headlights, battery packs, displays, and seals. New energy vehicle battery packs undergo -20℃~60℃ shocks to verify charging safety; seals are tested for deformation/leakage resistance.
3. Aerospace and Military Industry: "Reliability Guarantee" in Extreme Environments
Aerospace equipment (-50℃~100℃ liftoff temp changes) requires rigorous testing. Satellite solar panels undergo 2,000 cycles at -60℃~150℃ for space stability; aircraft black boxes are tested to ensure crash data preservation.
4. New Materials and Packaging Industry: "Pre-Screening" for Performance and Safety
New materials (aerospace titanium alloys) use the test to verify mechanical stability. Food/pharmaceutical packaging (aluminum foil, glass) is tested to prevent damage/leakage during refrigeration/transport.
V. Conclusion: The "Invisible Guardian" of Reliability Testing
The chamber’s value lies in simulating extreme environments to pre-test products, reducing after-sales risks and boosting competitiveness. As manufacturing advances, it has evolved from a niche tool to a standard asset for R&D and quality control.
For temperature reliability testing, select a chamber with parameters matching your products—pre-emptive defect detection is far more effective than post-failure fixes.
In product reliability testing, test chamber selection directly determines result value. While composite salt spray and high-low temperature test chambers are both environmental test equipment, their applications differ greatly. This guide helps you quickly select suitable equipment by testing requirements, application scenarios and core parameters.
I. Clarify Core Requirements First: What Problem Do You Need to Solve?
The first selection step is clarifying the core purpose—verifying "corrosion resistance" or "temperature change resistance", the essential difference between the two.
1. Choose Composite Salt Spray Test Chamber: When Focusing on "Corrosion Resistance Reliability"
For products exposed to high-salt/humid environments or relying on coatings/platings, the composite salt spray test chamber is ideal. It simulates marine/coastal industrial corrosion environments to accurately assess protective system durability.
Typical Requirement Scenarios:
① Coastal-used automotive parts (prevent coating peeling/rusting)
②Galvanized hardware (confirm salt spray corrosion resistance duration)
③ Marine engineering equipment (test overall salt corrosion resistance)
2. Choose High-Low Temperature Test Chamber: When Focusing on "Temperature Change Stability"
For products working in extreme/frequent temperature changes, the high-low temperature test chamber is essential. It simulates high-low temperature cycles to detect functional failures and structural deformations caused by temperature shifts.
Typical Requirement Scenarios:
• Mobile phone batteries (test low-temperature discharge performance)
• Industrial controllers (ensure high-temperature parameter stability)
• Outdoor instruments (assess temperature-induced shell cracking risk)
II. Quick Matching by Industry and Product Type
Product characteristics in different industries determine testing priorities. The following classifications enable quick selection.
1. Industries and Products Prioritizing Composite Salt Spray Test Chamber
Core feature: Products in high-salt environments or with protective coatings as key quality indicators.
• Automotive: Body parts, chassis components, electroplated decorations
• Hardware Electroplating: Galvanized/chromium parts, tools, sanitary hardware
• Marine/Shipbuilding: Ship parts, marine equipment, port machinery
• Outdoor Equipment: Communication base stations, PV brackets, lamp housings
2. Industries and Products Prioritizing High-Low Temperature Test Chamber
Core feature: Product performance sensitive to temperature or requiring extreme temperature adaptability.
• Electronics: Chips, circuit boards, sensors, home appliances
• New Energy: Lithium batteries, PV modules, energy storage devices
• Military/Aerospace: Military electronics, aerospace components
• Medical Devices: Portable medical equipment, outdoor emergency tools
III. Key Parameter Checklist for Selection
After confirming the general direction, match key parameters to avoid cost waste or insufficient performance.
1. Composite Salt Spray Test Chamber: Focus on "Corrosion-Related Parameters"
• Salt Spray Type: NSS/ASS/CASS (select per standard; CASS for automotive parts)
• Deposition Rate: 0.5-2mL/(80cm²·h) (comply with test standards)
• Additional Functions: Temperature-humidity cycle/drying (as needed)
• Chamber Material: PVC/PP (strong corrosion resistance)
2. High-Low Temperature Test Chamber: Focus on "Temperature Change-Related Parameters"
• Temperature Range: Conventional -70℃~150℃ (extendable for special needs)
• Change Rate: 5℃/min (rapid) for impact resistance; conventional for daily tests
• Humidity Function: Temperature-humidity type (if needed); pure high-low temperature otherwise
• Chamber Volume: Ensure product fit with ≥5cm wall distance (temperature uniformity)
IV. Selection Pitfalls: Common Misunderstandings
• Misunderstanding 1: Avoid redundant functions—no complex temperature control for salt spray tests; no humidity function for temperature-only tests
• Misunderstanding 2: Match parameters to actual needs—overly wide temperature ranges increase costs unnecessarily
• Misunderstanding 3: Comply with industry standards (e.g., ISO 9227 for automotive) to ensure valid results
The composite salt spray test chamber is core equipment for corrosion reliability testing of products such as metals and coatings, and its test data directly affects quality evaluation. However, negligence of details during actual operation often leads to distorted results. This article sorts out common mistakes and precautions to improve the standardization of tests.
I. Common Mistakes During Operation
(1) Pre-test Preparation: Basic Omissions Lay Hidden Risks
1. Non-standard salt solution preparation: Estimating salt dosage by experience or failing to use a balance with an accuracy of ≥0.1g easily causes concentration deviation from standards (e.g., 5% sodium chloride solution); using tap water instead of deionized water introduces interfering ions; injecting insufficiently mixed solution tends to clog nozzles and result in uneven salt spray distribution.
2. Improper sample treatment and placement: Unremoved oil and rust on the sample surface prevent salt spray from contacting the substrate; overlapping samples, insufficient spacing, or failure to align with the spray direction at an angle of 15°–30° all lead to data deviation.
3. Perfunctory equipment inspection: Insufficient water in the liquid storage tank may interrupt the test; salt deposits blocking nozzles and air pipes cause inadequate salt spray; uncalibrated temperature and humidity sensors result in loss of control over test conditions.
(2) During the Test: Improper Operation Causes Data Invalidity
1. Arbitrary adjustment of test parameters: Unauthorized modification of parameters such as temperature and salt spray volume leads to inaccurate data; frequent door opening midway disrupts the stable temperature and humidity environment inside the chamber.
2. Neglect of abnormal condition handling: Failure to shut down and troubleshoot anomalies (e.g., uneven salt spray, temperature/humidity fluctuations) results in distorted data. For instance, unaddressed abnormal salt spray deposition (1–2mL/(80cm²·h)) will make corrosion evaluation deviate from actual conditions.
3. Incomplete data recording: Only recording the start and end time without real-time logging of parameters (e.g., temperature and humidity); failing to timely document sample corrosion phenomena impairs subsequent analysis.
(3) Post-test: Improper Follow-up Affects Equipment Service Life and Data Analysis
1. Inadequate equipment cleaning: Residual salt solution corrodes the chamber and pipelines; salt deposits block nozzles and atomizers; corrosion products on the chamber wall contaminate subsequent samples.
2. Rash sample treatment and analysis: Failure to rinse and dry samples in accordance with standards allows residual salt to continue corroding the samples; relying solely on visual observation without instrumental quantitative data leads to unscientific conclusions.
3. Lack of equipment maintenance: Not inspecting sealing rings, lubricating components, or cleaning filters results in frequent equipment failures and shortened service life.
II. Core Precautions: Ensure Test Accuracy and Equipment Stability
1. Standardize solution preparation: Prepare solutions in accordance with standards such as GB/T 10125, weigh salt with a precision balance and use deionized water, verify concentration with a densitometer, and inject the solution after thorough mixing and standing.
2. Standardize sample operation: Degrease, derust, and dry samples; ensure sample spacing ≥20mm, distance from chamber wall ≥50mm, and place samples at 15°–30° to prevent shielding.
3. Comprehensively inspect equipment before testing: Check water level, remove salt deposits, calibrate sensors, and verify airtightness to ensure test conditions meet requirements.
4. Stabilize and control test parameters: Prohibit modification of core parameters; limit door opening time to ≤1 minute; record data hourly; shut down and troubleshoot anomalies before retesting.
5. Maintain and clean equipment post-test: Drain and rinse the equipment thoroughly; process samples in a standardized manner and conduct instrumental analysis; regularly replace filters, inspect sealing rings, and keep detailed maintenance records.
III. Conclusion
The quality of composite salt spray test chamber operation hinges on standardized procedures. Avoiding common mistakes and strictly following precautions ensures data accuracy to support product quality control, while extending equipment service life and reducing costs. Standardization is the core of accurate testing.
In the corrosion resistance testing of metal materials, coatings and components, the composite salt spray test chamber is an indispensable core equipment. It breaks through the limitations of traditional single salt spray tests, can simulate complex natural environments, and provides accurate data for product reliability evaluation. The following analyzes its key performance from four core dimensions.
I. Accurate Environmental Parameter Control Capability
Composite salt spray tests have extremely high precision requirements for parameters such as temperature, humidity and salt spray concentration, and the control performance of the equipment directly determines the validity of test data.
Temperature and Humidity Control: Supports wide-range adjustment of temperature (5℃-50℃) and humidity (45%-98%RH) in the salt spray chamber. The temperature fluctuation is ≤±0.5℃ and the humidity deviation is ≤±3%RH, which can stably simulate typical corrosive environments such as high humidity in coastal areas and high temperature with high salt.
Salt Spray Concentration Regulation: The salt water injection volume is controlled by a high-precision metering pump, and the salt spray sedimentation volume is stably maintained at 1-2ml/(80cm²·h). It supports the preparation of sodium chloride solution with a concentration of 5%-20%, and is also compatible with special test requirements such as acetic acid and copper-accelerated acetic acid salt spray (CASS).
II. Multi-dimensional Environmental Simulation Capability
Different from traditional salt spray machines, the core advantage of composite models lies in the simulation of "composite" scenarios, which can reproduce the synergistic corrosion effect of "salt spray + humidity + temperature cycle" in natural environments.
Multi-mode Switching: Supports seamless switching between three modes: continuous salt spray, intermittent salt spray and damp-heat cycle. For example, it simulates the alternating environment of high-temperature salt spray during the day and low-temperature high-humidity at night, which is closer to the actual service scenario of products.
Full-range Corrosion Coverage: The diameter of salt spray particles is controlled at 1-5μm. Through the annular layout of multiple nozzles, the uniform distribution of salt spray in the chamber is realized, covering the test samples without dead ends, ensuring the comparability of corrosion degrees of samples at different positions.
III. Stable and Reliable Operation Performance
Corrosion resistance tests often last for several days to months, and the long-term operation stability of the equipment is the key to ensuring the smooth completion of the test.
Anti-corrosion Structure Design: The inner tank of the test chamber is made of 316L stainless steel, and the nozzles are made of salt-corrosion-resistant ceramic materials, which can effectively resist the corrosion of the equipment itself by salt spray and extend its service life.
Intelligent Protection Mechanism: Equipped with functions such as low salt water level alarm, over-temperature protection and compressor overload protection. It will automatically shut down and give a prompt when parameters are abnormal, avoiding test interruption or sample damage.
IV. Convenient Operation and Data Management
Humanized operation design and complete data recording functions improve test efficiency and ensure data traceability.
Intelligent Control: Adopts a 7-inch touch screen, supports test parameter presets and automatic process operation, and can store more than 100 sets of test schemes, facilitating the call of repeated tests for similar products.
Data Visualization: Displays real-time data such as temperature, humidity and salt spray sedimentation in the chamber, supports regular data printing and USB export, and meets the standardization requirements of test reports.
Conclusion
The composite salt spray test chamber’s core performance lies in the integration of "precision control, multi-dimensional simulation and stable operation". For corrosion resistance testing of auto parts, marine engineering equipment or electronic components, a reliable chamber provides strong data support for product quality enhancement.
As a "quality gatekeeper" in industrial manufacturing and R&D, environmental test chambers simulate extreme conditions (high/low temperature, damp heat, salt spray, etc.) to pre-expose product defects and verify reliability, acting as the hidden "ultimate examiner" in labs.
Core Value: Preempting Potential Failures
Products face diverse harsh environments in real use: Antarctic mobile phones endure -40℃ cold, coastal auto parts resist salt spray corrosion, and aerospace components withstand drastic temperature-humidity fluctuations. Post-market exposure of environmental adaptability issues triggers safety risks, massive economic losses, and brand damage.
The chamber’s core role is to artificially replicate extreme environments or accelerated stresses in labs, condensing years of natural environmental testing into days/hours. It proactively identifies material aging, structural deformation, and performance degradation, providing data for R&D optimization and quality control.
Mainstream Types: Targeted Testing for Scenarios
Environmental test chambers are not one-size-fits-all; different types match specific testing needs:
High/Low Temperature Test Chamber: The basic type, simulating -70℃ to 150℃ (extended ranges for special models) to test product stability under temperature shocks, e.g., chip startup performance and plastic part thermal deformation.
Temperature Humidity Test Chamber: Adds 30%RH-98%RH humidity control to high/low temperature functions, simulating plum rain or tropical environments to assess moisture/mildew resistance, such as appliance casing rust-proofing and textile color fastness.
Salt Spray Test Chamber: Sprays neutral/acidic salt spray to simulate marine/industrial corrosion, testing metal and coating corrosion resistance for automotive, marine, and hardware industries.
Comprehensive Environmental Test Chamber: Integrates temperature, humidity, vibration, and light to replicate complex scenarios (e.g., aerospace launch/operation environments), serving as core equipment for high-end R&D.
Procurement & Usage: Key to Avoiding Risks
Demand Matching: Avoid over-pursuing ultra-wide ranges; define temperature/humidity limits and accuracy based on standards (IEC, GB, MIL-STD). For example, consumer electronics do not require military-grade wide-temperature equipment to prevent resource waste.
Core Performance Focus: Prioritize temperature uniformity, temp-humidity fluctuation (control accuracy), and temperature rise/fall rate (test efficiency), as these directly affect data reliability. Safety features (over-temperature alarm, water shortage protection) are also non-negligible.
Industry Trends: Intelligent & Green Upgrades
Driven by Industry 4.0, chambers are evolving toward intelligence: IoT modules enable remote monitoring and data traceability, while AI optimizes test parameters to cut manual intervention. Greenization is another direction—advanced refrigeration systems and insulation materials reduce energy consumption, aligning with green manufacturing concepts.
From consumer electronics and aerospace to automotive and medical devices, environmental test chambers underpin product reliability, laying a foundation for enterprise R&D and innovation. In the "quality-first" era, their value as the "ultimate examiner" will grow increasingly prominent.
In high-end manufacturing fields (aerospace, automotive electronics, consumer electronics, etc.), a product's ability to adapt to extreme temperature fluctuations directly determines its service life and safety. As core equipment for simulating environmental stress, the rapid temperature change test chamber becomes an "essential tool" in product reliability testing, relying on its advantages of "fast temperature rise/fall + precise temperature control."
1. Core Features: Speed & Precision Advantages
Fast temperature change rate: Conventional equipment reaches 1-3℃/min, while professional models can achieve 5-20℃/min (some special types exceed 30℃/min). It simulates extreme temperature cycles (-70℃ to 150℃) in a short time, greatly reducing test cycles.
High temperature field stability: Adopts multi-zone heating and vortex air flow control; internal temperature uniformity is controlled within ±2℃, avoiding test errors from local temperature differences and ensuring reliable data.
Intelligent control: Equipped with smart systems supporting custom temperature curve programming (presets over 100 test programs). Real-time data collection and curve display help engineers track the test process and improve efficiency.
2. Typical Applications: Industry-Specific Scenarios
Core value: Expose potential product defects under temperature cycles. Key application fields include:
Electronics Industry: Tests mobile phones, chips, circuit boards, etc. Detects issues like solder joint detachment and component aging to avoid malfunctions (crashing, short circuits) during use.
Automotive Field: Verifies on-board radar, battery packs, sensors. Simulates -40℃ to 85℃ cycles to ensure adaptability to extreme cold and heat.
Aerospace: Simulates space temperature stress for satellite components and aviation instruments, ensuring normal operation at high altitudes with severe temperature changes.
3. Key Usage Notes: Ensure Test Quality
Standard sample placement: Distribute samples evenly to avoid blocking air ducts; keep a ≥5cm distance from the chamber wall to prevent local temperature interference.
Regular maintenance & calibration: Inspect vulnerable components (sealing strips, heaters, sensors) regularly; conduct temperature accuracy calibration at least once a year to maintain optimal performance.
As the "gatekeeper" of product reliability testing, its performance directly affects quality judgment. Select industry-suitable equipment and standardize operations to make each test a reliable "touchstone" for product quality.
This guide summarizes key issues and solutions for temperature & humidity test chambers during dual 85 testing (85℃, 85% RH), focusing on quick troubleshooting and long-term maintenance for operators and customers.
I. Core Issues & Resolution System
Each issue includes root cause, immediate solution, and long-term prevention (except for defect exposure).
1. Failure to Reach 85% RH
Root Cause: Compressor over-dehumidifies—evaporator temperature below dew point (79-80℃) causes condensation, outpacing humidification.
Immediate Solution: Disable compressor; run only heating and humidification to maintain 85℃ and avoid condensation.
Prevention: Regularly calibrate humidifier atomization volume and check evaporator temperature sensor accuracy.
2. Temperature Out-of-Control/Fluctuations
Root Cause: Mainly faulty solid-state relays (keeps heating elements on), plus aging heating tubes or defective temperature sensors.
Immediate Solution: Cut power; inspect circuit with multimeter (relay on-off, heating tube damage, sensor accuracy) and replace faulty parts.
Prevention: 10-15min pre-calibration before testing; replace vulnerable parts (relays, sensors) every 1000 operating hours.
3. Water Marks/Condensation on Products
Root Cause: Residual oil/dust on products, or dense samples blocking air ducts (poor circulation, localized high humidity).
Immediate Solution: Pause test; clean products with anhydrous ethanol, dry, and reposition samples for proper spacing.
Prevention: Establish pre-test cleaning standards; clean air duct filters regularly and optimize sample rack layout.
4. Incorrect Operation Logic
Root Cause: Operator errors—misactivated refrigeration, wrong parameters (fast heating, delayed humidification), or mismatched operation modes.
Immediate Solution: Reset program (disable refrigeration, set 85℃/85% RH, sync humidification with heating).
Prevention: Develop SOPs; new employees must pass operation assessments (including simulated faults).
5. Material/Process Defect Exposure
Root Cause: Extreme environment accelerates aging—e.g., poor heat-resistant EVA film hydrolyzes (yellowing, delamination); leaky electronic packages cause corrosion/short circuits.
Measures: Inspect products post-test, record defects; judge qualification by material standards; optimize processes (e.g., use hydrolysis-resistant EVA, enhance sealant density).
I. Pre-Use Preparation
1. Equipment Inspection: Ensure the oven shell is well grounded, with no damage to the power cord and secure connections; check that vacuum valves and sealing rings are intact without aging or air leakage; verify that the vacuum pump oil level is within the scale range and the oil is clear and free of impurities.
2. Material Preparation: Materials to be dried must comply with the oven's applicable scope (flammable, explosive, and corrosive materials are prohibited). Place materials evenly in the baking tray, avoiding excessive stacking (not exceeding 1/2 of the tray height), and ensure there are ventilation gaps between materials and the oven wall, as well as between materials.
3. Environment Check: Ensure no flammable or explosive items are around the oven, the ventilation is good, and a maintenance space of at least 50cm is reserved; check that instruments such as the temperature controller and vacuum gauge are in zero state
II. Operation Procedure
1. Loading Materials into the Oven
Open the oven door, place the baking tray with materials steadily on the inner shelf, ensuring the tray is firmly positioned; close the oven door and tighten the door latch to ensure good sealing.
2. Vacuum System Operation
• Open the vacuum valves (first the oven's own valve, then the vacuum pump valve) and start the vacuum pump.
• Monitor the vacuum gauge; when the vacuum degree reaches the process requirement (usually -0.08~-0.1MPa, subject to material requirements), first close the vacuum pump valve, then turn off the vacuum pump to maintain the vacuum state.
3. Temperature Control Setting and Operation
• Connect the oven's main power supply, turn on the temperature controller, and set the "target temperature" and "holding time" according to process requirements (for stepwise heating, set parameters for each stage in sequence).
• Turn on the heating switch; the oven enters the heating stage. Check that the displayed temperature of the controller matches the actual temperature (if a temperature probe is available) to ensure stable heating.
• When the target temperature is reached, the system automatically enters the holding stage. During this period, regularly check the vacuum degree; if it is lower than the set value, repeat the vacuuming operation.
4. Shutdown and Material Retrieval
• After the holding period ends, turn off the heating switch and wait for the internal temperature to drop to a safe range (usually ≤50℃, subject to material properties).
• Slowly open the vacuum relief valve; after the vacuum gauge returns to zero, open the oven door and retrieve the materials (wear high-temperature resistant gloves to avoid scalding).
• Turn off the main power supply, clean residual debris inside the oven, and keep the equipment clean.
III. Key Notes
• Heating is strictly prohibited under vacuum conditions. Vacuuming must be done before heating to avoid abnormal internal pressure.
• If abnormal noise, odor, or instrument malfunction occurs during heating, immediately shut down and cut off power, and troubleshoot before reuse.
• Flammable and explosive materials must undergo safety testing. They can only be used under supervision after confirming no risks, and the oven must be equipped with explosion-proof devices.
• If the vacuum pump overheats or leaks oil during operation, shut it down for inspection promptly. Replace the pump oil regularly (recommended every 300 hours).
IV. Daily Maintenance
1. After daily use, clean the inner wall and shelves of the oven, and wipe the surface of the sealing ring to prevent foreign objects from affecting the sealing effect.
2. Weekly, check the flexibility of the vacuum valve switch and apply anti-rust lubricating oil to moving parts such as door hinges.
3. Monthly, calibrate the temperature controller and vacuum gauge to ensure accurate parameters; inspect the appearance of heating tubes and replace them promptly if damaged.
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