Alternating humidity and heat test for fire-fighting electronic products

In reliability experiments, humidity is generally applied in the high-temperature section. When analyzing the failure mechanism induced by humidity, the comprehensive effects of high temperature and low temperature in the later period must be considered. In terms of mechanical properties, moisture invades the surface of the material and causes material decomposition, mold growth and deformation. If it acts at the same time as high temperature, the moisture absorption of the insulating material will accelerate, and even adsorption, diffusion, absorption and respiration will occur, causing the surface of the material to swell, deform, bubble, and become thicker. It will also increase the friction of the moving parts and even get stuck. In terms of electricity, due to moisture, condensation is easy to occur when the temperature changes, causing electrical short circuits. High and low temperature alternating humidity and heat test is a necessary test item in the fields of aviation, automobiles, home appliances, scientific research and other fields. It is used to test and determine the parameters and performance of electrical, electronic and other products and materials after temperature environment changes of high temperature, low temperature, alternating humidity and heat or constant testing.
The alternating heat and humidity test of fire-fighting electronic products can determine the suitability of fire-fighting electronic products for use, transportation, placement or storage in an environment where high humidity and temperature cycle changes are combined and condensation will usually occur on the surface of the test sample.
Zhongke Testing Reliability Experiment Center has environmental testing capabilities for various fire-fighting electronic products, and provides professional alternating heat and humidity testing services for fire alarm equipment, alarm valves, fire communication equipment and other fire-fighting electronic products.

1. Fire alarm equipment: fire alarm triggering devices, fire alarm control devices, fire alarm devices, fire linkage control equipment; etc.
2. Alarm valve: wet alarm valve, dry alarm valve, deluge alarm valve, pre-action device, delayer, hydraulic sensor, hydraulic alarm bell, etc.
3. Fire communication equipment: fire alarm dispatcher, fire command and dispatch equipment, fire vehicle dynamic management device, etc.

1. Alternating moist heat operation test: Level 0 and I tests; Level II and III test temperatures are 40±2°C, and the cycle period is 2; Level IV test temperatures are both 55±2°C, and the cycle period is 2.
2. Alternating damp heat durability test: 0. Levels I and II are not tested; the test temperatures for levels III and IV are both 55±2℃, and the cycle period is 6.

GB/T 16838-2021 Environmental test methods and severity levels for fire-fighting electronic products
GB/T 2423.4-2008 Environmental testing of electrical and electronic products Part 2: Test methods Test Db: Alternating damp heat (12 h + 12 h cycle)