Engineers engaged in the study of environmental conditions of engineering products have summarized the environmental conditions and the environmental conditions induced by human activities into a series of test standards and norms. Through these standards to conduct environmental and reliability tests of engineering products. Therefore, when selecting environmental test chambers, we mainly rely on the test specifications and test standards of engineering products.
When the tested product is placed in an environmental chamber for testing, the working chamber volume of the climatic environment test chamber should be at least 3 to 5 times the outer volume of the tested product.
The range of foreign temperature test chambers is generally -73~+177°C or -70~180°C. Most domestic manufacturers’ products are -80~+130°C, -60~+130°C, -40~+130°C, and high temperature to 150°C. These temperature ranges usually meet the needs of most military and civil temperature tests in the country.
The temperature index of environmental test chambers at home and abroad is generally 20~98% RH or 30~98% RH. If the temperature humidity chamber does not have a dehumidification system, the temperature range is 60 to 98%. This type of test chamber can only be tested for high humidity, but it is much cheaper. It is worth noting that the corresponding temperature range or minimum dew point temperature should be indicated after the humidity indicator. Because relative humidity is directly related to temperature.
For the same absolute moisture content, the higher the temperature, the lower the relative humidity. For example, the absolute moisture content is 5 g/kg, when the temperature is 29°C, the relative humidity is 20% RH. And when the temperature is 6°C, the relative humidity is 90% RH. When the temperature drops below 4 ° C and the relative humidity exceeds 100%, condensation will occur in the box.
The temperature humidity test chambers have two conditions:
Users should choose according to actual needs.
Ordinary high and low temperature test chambers have no index of cooling rate. And the time from ambient temperature cooling to the nominal minimum temperature is generally 90 to 120 minutes.
However, The high and low temperature alternating test chamber and the high and low temperature alternating damp heat test chamber all have the requirements of variable temperature speed. And the variable temperature rate generally requires 1 ° C / min, and the speed can be adjusted within the range of this rate. The rapid temperature change test chamber has a faster temperature change rate. And the temperature rise and temperature drop rate can reach 30 ° C/min or more in some temperature ranges.
According to the relevant standards, the wind speed in the temperature humidity chamber should be less than 1.7 m/s when conducting environmental tests. However, the rapid temperature change test chamber and the multi-factor comprehensive environmental test chamber such as temperature, humidity and vibration are required to accelerate the flow rate of the circulating airflow in the tank. The wind speed is usually 2~3 m/s.
Temperature fluctuations are a relatively easy to implement parameter. The actual temperature fluctuations of most test chambers produced by all environmental test chamber manufacturers can be controlled within ±0.3 °C.
In fact, many standards have clear specifications for temperature field uniformity. For example, IEC 68-2-3 specifies that the temperature tolerance is ±2 °C, including the absolute error of the measurement, the slow temperature change and the temperature difference in the temperature cabinet. Therefore, the temperature of any two points in the test cabinet is kept as small as possible at all times.
Most of the humidity measured in the environmental test chamber is dry and wet bulb method, The relative humidity deviation should be ±2% RH or ±3% RH. In order to meet the requirements of temperature control accuracy, the temperature fluctuation is generally less than ± 0.2 ° C. Otherwise, it is difficult to meet the requirements of humidity control accuracy.
In general, there two cooling form in the environmental test chamber.
The choice of cooling method should be based on the actual situation of the laboratory. Water cooling is a top priority when conditions permit.
For the selection of temperature humidity chamber, in addition to some of the principles and specific technical indicators described earlier in this article, there are some factors that should be valued and considered.
From what has been discussed above, I recommend our environmental chamber to you.
KJ-2091 Programmable Temperature&Humidity Tester
GB/T2423/5170/10586, JIS C60068, ASTM D4714, CNS3625/12565/12566
This equipment can simulate different environment condition. It's appropriate for testing material performance, such as resist heat, resist dry,resist humidity and resist cold. That can define performance of material.
1.Use the high precision microcomputer touch temperature and humidity controller with high stability of platinum resistance to temperature and wind speed in the circulatory system of temperature and humidity test.
2.control temperature&humidity well-distributed, precisely and steady.
3. Completely independent system separate for testing in high temperature, low temperature and constant temperature&humidity environment.
|Internal size cm||40×50×40||50×50×60||70×70×85||100×80×100|
|External size cm||93×81×131||103×91×141||123×121×166||153×131×181|
|Tempetature range, accurancy||
-10,-20,-40,-60,-70～+150degree; ±0.1～± 0.3
|Humidity range, accurancy||
|Temp&humidity control||Korea TEMI880|
|Circulatory System||the circulatory system of wind speed|
|Heating System||SUS#304, stainless steel heater|
Surface evaporation, a transparent structure.
Fan cooling mode, high efficiency of all sealed compressor
|Water Supplying System||
Automatic control and transparent structure, automatic recovery of filtered water reuse.
Freezing latent heat dehumidification mode.
interior lights, anti-sweat&defogging device.
Leakage current, overload, compressor overload, over temperature, ultra-wet, dry, humidification temperature protection.
We are the manufacturer and we can produce the equipment that meets your requirementswe with the most favorable price for this equipment, and we also have perfect after-sales service, please contact me, I will send details and quotation to you.
Contact person:Sophia Cai
Contact Number:+86 13929477992(Wechat,Whatsapp)
Contact Person: Miss. Silivia Zhang
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