A programmable constant temperature and humidity test chamber is an important environmental test equipment, the following is a detailed introduction to it:
Definition and Use
A programmable constant temperature and humidity test chamber, also known as a high and low temperature alternating humidity test chamber, is a kind of environmental test chamber equipment that can apply temperature and humidity. It is mainly used to test the product in the high temperature, low temperature, and humidity environment simulation operation, to assess the working quality of the product. The equipment is widely used in aerospace, aviation, electronics, vehicles, batteries, scientific research, food, clothing, metals, chemicals, building materials and other fields, electrical and electronic products, materials, parts, and components to accelerate the equipment's thermal cycling test, alternating humidity and heat test, stable humidity and heat test, as well as high and low-temperature routine test, low-temperature storage.
Working Principle
The working principle of a programmable constant temperature and humidity test chamber is mainly composed of two parts: temperature regulation (heating, cooling) and humidification. Through the rotating fan installed in the box, the air will be discharged into the box to achieve gas circulation, balancing the temperature and humidity in the box. The temperature and humidity sensors built into the cabinet collect data and transmit it to the temperature and humidity controller for editing and processing, and then give instructions for temperature and humidity adjustment. These instructions are through the air heating unit, condensing tube and water tank heating evaporation unit, and other common completion.
system composition
The programmable constant temperature and humidity test chamber is mainly composed of the following systems:
Refrigeration system: used to provide a low-temperature environment, usually using closed air-cooled single-stage compression refrigeration or closed air-cooled composite compression refrigeration.
Heating system: used to provide the high-temperature environment, usually using a completely independent nickel-chromium alloy electric heating heater.
Humidification system: used to increase the humidity in the box, usually using external isolation, all stainless steel boiler type shallow surface evaporation humidifier.
Control system: used to control the temperature and humidity in the box, usually using an imported microcomputer temperature and humidity integrated controller, with high precision and ease of operation.
Sensor system: used to collect temperature and humidity data in the box, usually using platinum resistance PT100Ω as temperature and humidity sensor.
Air circulation system: used to realize the gas circulation in the box to make the temperature and humidity more uniform.
Product Features
Perfect modeling design: round arc modeling and surface spraying treatment, high-quality appearance, and the use of a lat non-reactive handle, easy to operate and safe and reliable.
Large observation window: adopting a three-layer vacuum coating window and Philips energy-saving fluorescent lamps to keep a clear observation effect, and can observe the condition of the specimen at any time.
High-precision control: Imported microcomputer temperature and humidity integrated controller, setting accuracy and indication accuracy of ± 0.1 ℃.
Multi-group PID control function: It has a precision monitoring function and is displayed on the screen in the form of data.
Safety protection: an electronic over-temperature protection device independent of the main controller, which can set the upper limit of temperature protection for the measured object. At the same time, it also has 15 full-featured system detections to ensure the safe operation of the machine.
Application fields and key applications
Programmable constant temperature and humidity tester has a wide range of applications, especially in the following industries with a key role:
Scientific research institutions: for environmental reliability testing, to find problems and failures, corrections and improvements.
Electronic industry: to detect the performance changes of electronic products in high temperature, low temperature, and humidity environments, to improve the quality and performance of electronic equipment.
Food enterprises: for food storage temperature and humidity control, to ensure stable food quality.
In addition, the equipment can also be used to test the stability of drugs, reagent transport, and so on.
Precautions
When using the programmable constant temperature and humidity test chamber, it should ensure that the power supply voltage is stable and well grounded.
It is forbidden to put explosive, flammable, corrosive, and harmful substances into the test box.
Before carrying out the test, the temperature and humidity sensors in the test chamber should be checked to see if they work normally.
In the test process, should always observe the operation status of the test chamber, if any abnormality should be timely shutdown and troubleshoot.
When not in use for a long time, the water in the test chamber should be drained and kept dry.