Both the constant temperature and humidity chamber and the high and low temperature test chamber have tested the adaptability and reliability of the items in different climatic environments. Due to the appearance design of the constant temperature and humidity test chamber being the same as that of the high and low temperature testing machine.

It is necessary to distinguish whether the customer is using a constant temperature and humidity test chamber or a high and low temperature test chamber, and to determine whether environmental humidity testing is required; The controller should determine whether to use a touch screen or buttons, and the touch screen controller supports multilingual settings. There is not much difference in appearance between the two, but their performance and usage are different. After understanding their differences, users can choose the appropriate equipment based on their product testing needs.

A constant temperature and humidity test chamber is an environmental equipment. When using this mechanical equipment, the selection must be based on the net weight, size, model, specifications, and model of the test product. Different mechanical equipment models and specifications, as well as different temperature ranges, have different prices.

The space inside the laboratory is directly proportional to the price. The larger the specifications of the inner chamber, the higher the price; The lower the temperature range, the higher the price, because the lower the temperature, the greater the manufacturing difficulty of mechanical equipment; The larger the refrigeration unit and the higher the configuration, the higher the price.

1 Related specifications

(1) Factory requirements

• There must be a space of at least 60cm around the equipment;
• The equipment has no direct sunlight or other heat sources that directly radiate;
• There is no high concentration of dust or corrosive substances around the equipment;
• No strong electromagnetic field;
• There are no flammable, explosive, corrosive substances or dust around the equipment;
• There is no strong vibration around the equipment;
• Atmospheric pressure: at one standard atmospheric pressure (standard atmospheric pressure value is 101.325kPa).

(2) Environmental requirements

• Environmental temperature: 5 ℃~+30 ℃ (average temperature within 24 hours ≤ 30 ℃)
• Environmental humidity: ≤ 85%RH

(3) Load conditions

• Prohibit testing flammable and explosive materials;
• Prohibit testing items with severe corrosion and pollution.

(4) Precautions

• Please confirm the power connection before operating the constant temperature and humidity test chamber;
• Please note that this device must be safely grounded to prevent static electricity induction;
• Avoid shutting down and restarting the refrigeration unit within fifteen minutes;
• Water supply conditions: Pure water, distilled water, and deionized water are used. Electrical resistivity ≥ 500 Ω· m
• The lighting should be turned off at all times except when necessary;
• During operation, please do not open the chamber door unless necessary;
• After each experiment, the power, gas, and water sources should be cut off to avoid the equipment being in a charged standby state for a long time.

2 Something problem

When the ambient temperature is high, the overpressure of the compressor in the constant temperature and humidity test chamber is due to the high ambient temperature. The ambient temperature should be controlled between 5 ℃ and 28 ℃, and the relative humidity should be less than 85%. Due to the high ambient temperature, the compressor’s heat dissipation is poor, which can affect its use. If the temperature is too high, the compressor will automatically protect itself and generate an alarm. You can consult the equipment manufacturer. This is also a common problem, mainly because many devices are limited by the customer’s site or insufficient consideration for site planning in the early stage.

During use, if the water pipe turns yellow and there is water rust in the water tank, it is due to the oxidation of water in the air for a long time, which is a normal phenomenon. It can be cleaned by physical methods (using a soft cloth or sponge).

The water quality deteriorates, and if impure water is used or not cleaned for a long time, fibers and microorganisms in the air are inevitably present in the water. If it doesn’t come out, it will affect the wet bulb temperature, etc,

We generally recommend changing the wet ball gauze once for each experiment, as it is a consumable for the experiment. The contamination of wet bulb gauze will affect the accuracy of wet bulb temperature detection, and the accuracy of temperature and humidity will definitely be affected.

When the ambient temperature is too high, the cooling rate is relatively slow, which is a normal phenomenon; For better performance of the equipment, it is recommended to control the ambient temperature at 20-25 ℃;

The constant temperature and humidity test chamber should be regularly cleaned of internal and external dust to maintain dryness and cleanliness.

Prevent burns and electric shock during high-temperature work.

The above are some issues that are easily overlooked when using a constant temperature and humidity test chamber.

3 Maintenance suggestions

The maintenance of the constant temperature and humidity test chamber is a very important aspect for the service life of the instrument. Careful and meticulous care will make the instrument stand out in all aspects compared to instruments in the same industry, and there is no clear distinction between high quality and poor quality from the beginning. Therefore, incomplete maintenance work is an urgent task. The following is the method provided by the editor, which can be used as a reference.

• The refrigeration system of the constant temperature and humidity test chamber is the core of the test chamber. Please check all steel pipes for leakage at least once a year, and promptly deal with any oil stains or leaks at all joints and welding interfaces.
• Dry and wet bulbs and wet cloths should be checked regularly. When the surface of the test cloth is not clean or hardened, or after high temperature control above 85 ℃, continue with temperature and humidity control before proceeding. After inspection, if there is any non absorbent material, please replace it.The test cloth is usually replaced once every three months. When replacing, we need to wipe the thermometer with a clean cloth. When replacing the new test cloth, we should wash our hands first and then clean the sink.
• After the constant temperature and humidity test chamber reaches the testing time for the test product, when taking out the product, it must be turned off and the staff must wear dry, electricity resistant, and moisture resistant gloves for taking out and placing the product.
• The ground around and at the bottom of the constant temperature and humidity test chamber should be kept clean at all times to prevent a large amount of dust.

The maintenance of the constant temperature and humidity test chamber is generally based on the above. As long as it is well maintained regularly, it will bring great benefits to customers’ profits.