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The constant temperature and humidity chamber operation manual

Test scope

A constant temperature and humidity test chamber, also known as the constant temperature and humidity test machine, or programmable heat and humidity test chamber, is used to test heat resistance, cold resistance, dry resistance, and moisture resistance of diverse materials under a variety of environmental conditions.

A constant temperature and humidity chamber can be applied to carry out adaptability tests of instruments, electricians, electronics, parts, and materials when they are stored, transported, and used in environmental conditions with high humidity and temperature or low humidity and temperature. It is also well-suit for testing several raw materials, including electronics, electrical, and plastics so as to figure out their resistances to heat, cold, dryness, and moisture. Meanwhile, it is a piece of reliable testing equipment for quality control engineering.

scopeTop 6 factors to consider when buying a constant temperature and humidity chamber


For every environmental or reliability test, there are some strict regulations on the category of environmental factors, value, and tolerance. Moreover, environmental factors which are not needed in the test should be prevented from the test for providing the exact evidence to analyze the product failure and failure mode. As a result, the test product is only allowed to be put in the specified environment instead of any other environmental stress interference.


Environmental test equipment may carry out multiple tests of the same type of product while an engineering product under test may be put into different environmental test equipment for testing. The environmental conditions created by the environmental test equipment are required to be repeatable in order to ensure the test results are comparable which are all about the same product in the same test specification under the specified environmental test conditions.


A constant temperature and humidity chamber must accurately or similarly simulate the process of the use, storage, shipping, and other aspects of engineering products. Additionally, it must satisfy the demands of the uniformity of the temperature field and the accuracy of the temperature control in accordance with defined test specifications, requirements of test value for high temperature and low temperature, and the time of test which are specified by various types of products. We can guarantee a precise reproduction of environmental conditions in the environmental test only by doing this.

Safety and reliability

The test cycle of environmental testing, especially reliability testing, is long. Sometimes, the machine will test military products with a very high value. In the test process, the testers need to carry out the operation or test around the scene. Therefore, the environmental test equipment is required to be characterized by safe and easy operation, reliable use, long working life, and so on for the normal operation of the experiment. It is composed of many safety protective devices, which are over-temperature in the workroom, the heater short-circuits protector, humidifier short-circuits protector, fan overload protector, compressor overpressure protector, compressor overload protector, water break or shortage protector, leakage protector, and safe and reliable grounding device.

Measurability and controllability

The environmental conditions provided by any environmental condition must be observable and controllable, which is not only set to limit environmental parameters to a certain tolerance range, but also for the safety of the experiment in order to eliminate the unnecessary loss caused by the uncontrolled environmental condition.

Selection of key parts selection


Device Brand Model Origin


Physical picture


Controller TEMI880 South Korea

1 pc



Compressor 1.5 HP type Taikang, France

1 pc



Evaporator Medium Power Taiwan

1 pc



Danfoss expansion valve Danfoss Denmark

1 pc

Danfoss expansion valve


Drying filter Danfoss Denmark

1 pc

Drying filter


Trigger heat exchanger Golik Taiwan

1 pc

Trigger heat exchanger


Condenser Colliers Taiwan 1 pc Condenser

Installation conditions of constant temperature and humidity chamber

In order to facilitate the heat dissipation and maintenance of the box, the place where the constant temperature and humidity chamber is installed must meet the following requirements.

1 The distance between the adjacent wall or artifact should be 300 mm.

2 In order to play a stable test chamber function and performance, the chosen place should maintain a year-round temperature of 15 ~ 35 ℃, with a relative humidity greater than 85%.

3 Dramatic changes are not allowed to occur in the ambient temperature of the installation site.

4 It should be installed in a place with good ventilation without direct sunlight. The air quality should be maintained at a high level with a high concentration of dust and corrosive gases, and flammable and explosive gases.

5 The chamber should be installed on a horizontal surface (the installation should be leveled on the ground to confirm the level). It should be installed in a position that is as close as possible to the power supply and is far away from combustible materials, explosive materials, and high-temperature heat sources.

The maintenance of constant temperature and humidity chamber

The constant temperature and humidity chamber will be more prone to damage if it is not properly maintained. Instead, the machine can be distinguished by longer life and convenient operation owing to scientific maintenance. Additionally, the individual using the machine needs to know how it works and be able to solve simple issues. The followings are the maintenance of constant temperature and humidity chambers in daily life.

The condenser, humidifier, humidification water tray, and inner box should all be inspected for cleanliness.

Additionally, the test cotton should be examined for stains and hardening.

Next, we must figure out whether the constant temperature and humidity test chamber’s safety device works normally.

Furthermore, testing hazardous things like explosives, combustibles, and flammable materials will not be permitted.

maintenanceWelcome to TESTEX – a professional textile testing instrument supplier – temperature and humidity chamber is on sale. If you are interested in it,  contact us to get a detailed quoted price.

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