Temperature and humidity three comprehensive test chamberoverview

Temperature and humidity three comprehensive test box product usage

Provide users with comprehensive stress screening tests for temperature, humidity, and vibration of the entire machine (or components), electrical appliances, instruments, materials, etc., in order to assess the adaptability of the test sample or evaluate its behavior. Compared with the effect of a single factor, it can more accurately reflect the adaptability of electrical and electronic products to temperature, humidity, and vibration combined environmental changes during transportation and actual use, and expose product defects. It is an essential and important testing method throughout the entire process of new product development, prototype testing, and product qualification testing.

Main technical parameters of temperature and humidity three comprehensive test box

1. Studio size: 1000 × 900 × 1100mm (depth × width × height); WSZD-100
5. Heating rate: ≥ 1 ℃/min
6. Cooling rate: ≥ 1 ℃/min
7. Control accuracy: ≤ 1 ℃
8. Temperature uniformity: ≤ 2 ℃ (-40~100 ℃)
9. Temperature fluctuation: ± 0.5 ℃
10. Humidity control accuracy: ± 3% RH;
11. Cooling method: mechanical cooling/air cooling or water cooling
12. Power supply: AC 380V ± 10%, 50Hz ± 5HZ, three-phase five wire system
13. Total installed power: approximately 13.4Kw
The above technical data are all at room temperature of 20 ± 5 ℃, water temperature of 25 ℃, cooling water pressure of 0.15-0.3MPa, relative humidity ≤ 85% R.H, and constant temperature for two hours

The product is designed and manufactured according to the corresponding technical conditions of GB10592-89 high and low temperature change test chamber and GB10586-89 humid heat test chamber, and is connected to a vibration table for high and low temperature, humid heat, and vibration tests. Mainly providing temperature and humidity changing environments for aerospace, aviation, petroleum, chemical, electronic, communication, scientific research, and production units. At the same time, electrical vibration stress can be applied to the test sample in the test chamber according to the prescribed cycle, for users to conduct comprehensive temperature, humidity, and vibration stress screening tests on the whole machine (or components), electrical appliances, instruments, materials, etc., in order to assess the adaptability of the test sample or evaluate its behavior. Compared with the effect of a single factor, it can more accurately reflect the adaptability of electrical and electronic products to temperature, humidity, and vibration combined environmental changes during transportation and actual use, and expose product defects. It is an essential and important testing method throughout the entire process of new product development, prototype testing, and product qualification testing.


Composition of temperature and humidity three comprehensive test chamber

The test box consists of the following parts: test box body, motion connection system, control system, refrigeration/dehumidification system, heating/humidification system, air duct system, etc.


Compliant with standards

The product meets the design, manufacturing, and measurement standards of GB10586-89, GB10589-89, GB/T2423.3-93, IEC68-2-3, GB2423.1-89, IEC68-2-1 Test A Cold, IEC68-2-30, GB/T2423.4-93 Test Db, etc.

Temperature and humidity three comprehensive test box refrigeration/dehumidification system
4.1 Refrigeration compressor: A refrigeration system composed of semi enclosed industrial compressor units produced by French "Taikang" or German "Bizelle" companies. This model of compressor has a large cooling capacity, low noise, low energy consumption, high efficiency, and can operate stably and reliably for a long time; The refrigeration system also adopts advanced PLC control and energy regulation cold end output method, surpassing the traditional cold and hot balance control method. It meets the requirements through PID regulation, greatly reducing the user's usage cost, extending the service life of the equipment, and improving the economic efficiency of equipment use; Beneficial for reducing equipment noise and improving the working environment of the laboratory.
4.2 The refrigeration evaporator and dehumidifier are equipped with complete sets of equipment from the United States, with single-sided welding and cold expansion;
4.3 Cooling method: air-cooled or water-cooled (when water-cooled, the water temperature should be ≤ 25 ℃, and the water supply pressure should be between 0.15Mpa and 0.3Mpa);
4.4 Main refrigeration accessories: solenoid valves, globe valves, filters, pressure controllers, oil separators, plate heat exchangers, etc. are all imported branded products.
4.5 Refrigerant: Environmentally friendly refrigerant R404A is used
4.6 Use high-quality oxygen free copper pipes and nitrogen filled welding processes (traditional methods use ordinary copper pipes, and direct welding methods can easily produce oxides on the inner wall of the copper pipes, causing blockages in the refrigeration system and preventing or slowing down the temperature of the test chamber)
Heating/humidification system
The heating system is located inside the air-conditioned room and consists of multiple sets of nickel chromium alloy threaded electric heaters and polytetrafluoroethylene aviation silver plated protective wires. The humidification system is located inside the air duct system and consists of a stainless steel humidifier.
Air duct system
The air duct system is located in the interlayer at the rear of the laboratory, and is equipped with heaters, humidifiers, refrigeration evaporators, dehumidification evaporators, fan blades, temperature and humidity sampling sensors, and other devices. When the fan rotates at high speed, the air in the working chamber is sucked into the air duct from the lower part, and is fully mixed with the heat and cold generated by the heater and refrigeration evaporator in the air duct, blown out from above. The air that has undergone heat exchange with the test sample in the working chamber is then sucked into the air duct for mixing; Repeatedly cycling to achieve the target temperature and humidity requirements, while ensuring high temperature and humidity uniformity indicators in the laboratory.
Temperature and humidity three comprehensive test chamberbox
The test box body adopts a modular structure for on-site installation: the entire test box consists of the test box body, air duct system, heating system, refrigeration system, electrical control cabinet, and refrigeration unit. The refrigeration unit is located at the rear of the test box and is easy to install the equipment. An independent electrical control cabinet is used for easy operation. The walls inside the laboratory are made of SUS304 # stainless steel plate, and the outer shell of the box is processed and formed from cold-rolled steel plate. The surface is treated with acid pickling and phosphating, and then electrostatically sprayed with plastic (computer color). The insulation material for the box body is made of flame-retardant polyurethane foam and glass fiber wool, with good insulation effect. The outer surface of the test box does not frost or condense. The door of the test chamber is sealed with environment-friendly silicone rubber strip, which is resistant to high and low temperatures, aging and has good sealing performance. In order to prevent condensation or frosting at the edges of the door frame and door during low-temperature testing, electric defrosting devices are installed at the edges of the door frame and door. There is an overflow hole at the bottom of the box, which can collect the condensed water inside the box and discharge it out of the box. There is a water tray at the bottom of the compressor to collect and discharge the water generated by the frosting of the compressor and low-temperature pipelines outdoors to prevent it from scattering on the ground. The control panel is molded in one go using a dedicated mold, which is beautiful and easy to install. The front of the box is equipped with multiple layers of hollow resistance film heating anti frost glass observation windows, and the test box is equipped with switchable lighting for easy observation.
Sports Connection System
The entire test chamber is fixed on a horizontally movable and vertically adjustable lifting platform, which facilitates the connection between the test chamber and the vibration table for comprehensive temperature, humidity, and vibration tests. The horizontal displacement of the lifting platform can reach 2500mm, the vertical lifting distance is 1200mm, the lifting weight of the lifting platform is 2T, and the self weight of the equipment is ≤ 1T. The bottom of the test box body is reserved with movable interfaces connected to the vibration table, with interface sizes of ф 200mm each (for vertical vibration) and 1000 × 1000mm each (for horizontal vibration). There is sufficient space at the interface between the test box and the vibration table to accommodate the displacement of the vibration table during vertical and horizontal vibration. A pressure relief port is reserved at the top of the test box to buffer the pressure increase generated inside the test box during vibration of the vibration table. The interface connection between the test chamber and the vibration table surface is processed into a circular (square) corrugated tube shape using high and low temperature resistant organic composite materials,
The sealing body has high strength, high flexibility, high sealing, high insulation, and can withstand high and low temperatures and humidity for a long time. It adopts double-layer sealing with good sealing effect. The test box is equipped with three blind plates, and different blind plates can be used for high and low temperature vertical vibration tests, high and low temperature horizontal vibration tests, and separate temperature and humidity cycle tests. Due to the heavy blind plates, in order to facilitate the replacement of blind plates, the equipment can be equipped with three mobile trolleys. The height of the trolleys is level with the bottom of the test box. When it is necessary to replace the blind plates, the replaced blind plates can be pushed down to the interface of the test box with a trolley for easy replacement. When the test chamber is connected to the vibration table, the test chamber automatically moves horizontally to the connection position of the vibration table, and then rises and falls to the interface connection position according to the required height, and can perform temperature and humidity vibration tests with the test chamber.
control system
3.1 Temperature and humidity measurement sensor: PT100 high-precision armored temperature and humidity sensor is used;
3.2 Central controller: The control system is composed of a Japanese "Profus" 5.7-inch Chinese color touch display screen, a PLC programmer produced by German "Siemens" company, and a German "Siemens" temperature module (this system is a scientific research achievement independently developed by our company and has independent intellectual property rights). The control system is stable and reliable, and can display set parameters, test curves, running time, fault records, historical records and help information, heater working status, and has automatic operation of the test program; The programming of the control program adopts a human-machine dialogue method, which only requires setting temperature, humidity, and time to achieve automatic operation function; The detection device can automatically display detailed faults and alarms.
a. Human computer dialogue interface: STN color LCD, 64 colors, with built-in 128KB SRAM lithium battery for data backup. CF card can be used for expansion and data storage. Adopting a 5.7-inch color LCD touch screen, the Chinese character menu prompts setting accuracy: temperature: 0.1 ℃; Humidity: 0.1% RH; Time: 1 minute.
b. Large program capacity: 20 programs can be programmed, modified, and stored independently, with 99 segments per program and a maximum of 999 loops per program;
c. Control operation mode: program operation mode, constant operation mode;
d. Experimental data display: can display set temperature, set relative humidity, measured temperature, measured relative humidity, total operating time, segment operating time, segment remaining time, heating and humidification status, calendar time;
e. Data output method: optional micro digital printer, printing time interval can be set;
f. Fault information display: When the device experiences abnormal conditions, the display screen will show the fault status, possible causes, and recommended solutions in Chinese;
g. Built in PLC function: The equipment uses Siemens PLC to directly drive various execution components, and logical operations are completed by PLC;
h. The equipment is equipped with one working time accumulation timer; The device has power on self-test, automatic alarm and management functions;
i. Refrigeration machine industrial control automatic control: It has energy regulation function, automatically selects the working state of the refrigeration machine according to different test conditions, and achieves the goal of energy saving and consumption reduction;
j. Equipped with curve recording function: By expanding the CF card, the actual measured temperature and humidity can be saved; Time for setting temperature, humidity, and sampling time: capable of storing 360 day (1.5 minute sampling period) curve records;
k. Equipped with power-off protection function: It has power-off protection function and automatic opening function, and users can set it according to their needs.
l. Equipped with standard RS232 communication interface
3.3 Power control: Solid state relays are used for the execution components, ensuring reliable control, no noise, and no grid pollution;
3.4 Main electrical components: Circuit breakers, leakage protectors, AC contactors, and thermal relays adopt the international brand "LG"
The product, solid-state relay, adopts the German "Frank" product.