About Temperature & Humidity chamber - why do use it, and what is the something to know for use prop
About Temperature & Humidity chamber - why do use it, and what is the something to know for use properly?
The finished parts or products are exposed to various environments after ex-factory. According to the RAC (reliability Analysis Center) report from the United States, the temperature is the biggest influence on the product and humidity is the third place among many environmental factors.
Too high or low temperature and humidity might cause the thermal or mechanical deformation by the expansion and shrinkage of products, therefore it is necessary to verify that the product and system can perform well even in this extreme environment. Temperature and moisture resistance tests make moisture penetrate parts and finished products to check airtightness, or inspect the discoloration, corrosion, and so on to ensure product quality and reliability in advance.
In various fields such as electronics, automotive, laboratory, semiconductor, mechanical engineering, and textiles, the reliability test is carried out requisitely with Temperature & Humidity chamber to verify the reliability of the product and minimize the system error and failure rate. It would improve the reliability of the product, also that makes the strength to gain the upper place in a market.
┃What is the Temperature & Humidity Chamber?
Temp. & Humid Chamber (TH Chamber) controls the specific temperature and humidity stably, such as high temperature/low temperature/high humidity/low humidity in a certain space. Normally the reliability testing is carried out under extreme weather conditions beyond the necessary in a chamber, the test data can be used to predict the durability of products. So TH chamber is essential equipment for durability and reliability testing of products in all common industries - electronics, electronic modules, precision machinery, textiles, pharmaceuticals, genetic engineering, and optical material components.
TH chamber performs the heating, cooling, dehumidification, and humidification to form the certain temperature and humidity, and has functions to keep the temperature and humidity stable.
TH chamber performs the heating to reach the set temperature in case the present temperature of the inside chamber is lower, and it performs the cooling process in the opposite case. Also, the humidity control is the same as the temperature control, the TH chamber performs the humidification or dehumidification to reach the set humidity and keep it stable. To get the correct data, the temperature and humidity should be checked continually by the sensor which passes a calibration.
┃ Which water should be used for the TH chamber?
Water is an essential factor to control the humidity for using the TH chamber.
But, in the case of using groundwater or low-quality water, the corrosion of the chamber may accelerate, then the durability problems would occur to the humidifier parts or the malfunction of the water lever at the water supplement line. So we recommend using the water according to the below conditions
(1) PH 6.2~7.2
(2) Conductivity 20 U/cm
By using suitable water for the TH chamber, the lifetime of parts can be expanded and it is possible to schedule the regular cleaning plan. Also, it makes to keep the same test condition for the specimen and to do a clean test under no contamination. We have treated the electrolytic polishing on the inside of the water tank to increase the corrosion resistance, and the heater is resistant also against corrosion and external contamination. The inside of JEIO TECH's TH chamber is made of SUS for corrosion resistance.
┃ How to fill water properly in a water tank of the TH chamber?
The amount of used water depends on the test requirement, and there are 3 kinds of how to supply water as below.
✓Manual supply: Supplying water when the user wants through the water inlet.
(Available to supply water conveniently with checking the water level.)
✓Direct water line connection: Connecting the distilled water to the water supply line directly, useful for the long-term test.
✓ Connecting the extra water tank which is filled the distilled water to the water supply line. Useful if there is no water line.
The water should be supplied continually to control humidity during the test, the accident may occur due to overheating if there is not enough water in the water tank. JEIO TECH's TH chamber measures how much water remains in the water tank by Load cell which is installed below of tank, and display it as a water drop pictures on the controller allows figure out the remaining water easily. Also, a warning alarm occurs if the remaining water is below 25%, and the operation is stopped when the remaining water is below 10% to protect the user and laboratory from dangerous situations.
Long-term tests or the high temperature and humidity test are possible in a stable, thanks to checking the amount of remaining water easily and available to supply the water continually in the water tank during supplying to the cartridge tank even in a use. The water supply can be minimized with the effective water supply system and water recirculation system.
Also, LC Connected (Mobile monitoring system, option) provides the notification of remaining water through the mobile application, allows you to control the chamber whenever and wherever you are.
┃ What considerations to choose the optimal TH chamber.
✓Usage purpose and test requirement
It needs to consider the temperature and humidity control range, tolerances, temperature, and humidity rising/falling time according to the test requirement. And the others - direct waterline, inner door, airflow rate of circulation air inside, and so on - should be considered depends on the application, if you need, consult the details with the manufacturer.
✓Test specimens
Consider the features of specimens whether it occurs the flammable or corrosive substance according to the test conditions. And normally there is a valid temperature and humidity control area inside the chamber, so choose the suitable internal volume considering the size of specimens.
✓Space for the installation
Make sure the way how to transport the chamber to the installation space. And TH chamber has an Air-cooled refrigeration system, so check the environment of space such as temperature and humidity, direct sunlight exposure, ventilation, and the infra of water supply and drain.
The main requirement is that keep away from a heat source, the distance from the wall (side and rear) must be 20cm at least. If the temperature of the installation space is too high, the refrigeration system would occur errors due to overheating the refrigerant by the failure of a condenser. The other way round, the refrigeration system occurs malfunction either due to an excessive condensation and inappropriate level of refrigerant when the temperature is low in the installation space. The refrigeration system is very sensitive to the temperature of the environment, so make sure to keep the temperature range 18~30C° and the humidity below 80RH%.
When you choose the suitable TH chamber, various factors should be considered such as the application, test purpose, the features of the specimen, and the installation environment as we describe, so it recommends consulting with an expert.
In terms of reliability, if any test method is under the same test conditions, the same results must be obtained even if the test device or the experimenter is different.
JEIO TECH's TH chamber is a product that has been designed and manufactured based on the international specifications and has been tested for the final performance, we have verified the excellent reproducibility through the test aimed at determining the durability of the module against the long-term penetration of humidity under 85±2℃ and 85±5RH% for 6 weeks.
We provide TH chambers in various specifications and expert technical consultations based on our accumulated skills and experience over 33 years. If you have any questions and inquiries, please contact us freely.
