Desktop constant temperature and humidity test chamber

Structural Material

1. Inner box material: SUS304# (1.0mm thick) stainless steel plate, with acid resistance, corrosion resistance, easy to clean and other advantages.

2. Outer box material: cold-rolled steel plate paint treatment, 1.0mm thick (box dark gray, box door sky blue).
3. Door handle: no reaction, explosion-proof door handle, easy to operate, safe and reliable.

4. Insulation system: the use of ultra-fine glass fiber to fill the insulation area, the connection parts of the inner and outer boxes using non-metal high and low temperature resistant materials, effectively reduce temperature conduction; The door seal is made of refined silicone rubber, so that there is no aging and hardening phenomenon at high and low temperatures, and the sealing is more reliable; The humidification method is isolated humidification.

5. Moving and positioning device: the bottom of the machine is installed with high-quality fixed PU movable wheel, which can easily move the machine to the specified position, and then fix the caster.

6. Sample rack: SUS304# stainless steel punching and bending into a network, easy to use, the spacing between the material racks can be adjusted, the standard configuration of two pieces, the sample according to the load ≧20kg evenly distributed.

7. Test hole: open Φ50mm test hole, and attach the corresponding thermal insulation accessories and special sealing soft plug

8. Observation window: double-layer vacuum reinforced glass is used, and the inner glued conductive film is heated and defrosted to clearly observe the test process.

Standard:
The performance index meets the requirements of GB5170, 2, 3, 5, 6-95 verification methods for basic parameters of environmental test equipment for electrical and electronic products low temperature, high temperature, constant humidity and alternating humidity heat test equipment.
Basic environmental test procedures for electrical and electronic products test a: low temperature test method

GB 2423.1-89(IEC68-2-1)
Basic environmental test procedures for electrical and electronic products test B: high temperature test method

GB 2423.2-89(IEC68-2-2)
Basic environmental test procedures for electrical and electronic products test CA: constant damp heat test method

GB/T2423.3-93(IEC68-2-3)
Basic environmental test procedures for electrical and electronic products test Da: alternating damp heat test method
GB/T2423.4-93 (IEC68-2-30)

Refrigeration system:

Compressor: fully hermetic compressor imported from France
Refrigerant: Environmental refrigerant R404A
Condenser: fin type with heat dissipation motor
Evaporator: fin type multi section automatic load capacity adjustment
Other accessories: desiccant, refrigerant flow window, repair valve
Expansion system: refrigeration system with capacity control

Control system:

LCD 7 "LCD touch panel, drawing face to talk input data, temperature and humidity can be programmed at the same time, curve display, set value / display value curve. It supports the direct export of temperature and humidity record data by U disk, and can display various alarms respectively. When the fault occurs, it can display the fault on the screen to eliminate the fault and misoperation. Multi group PID control function, precise monitoring function, and display on the screen in the form of data.

Controller specification:
1. Accuracy: temperature ± 0.1 ℃ + 1digit, humidity ± 1% RH + 1digit
2. Resolution: temperature ± 0.01, humidity 0.1% R.H
3. With upper and lower limit standby and alarm functions
4. Temperature and humidity input signal selection PT 100 Ω× 2 (dry bulb and wet bulb)
5. Temperature and humidity conversion output: 4 ~ 20mA
6. Six groups of P.I.D control parameter setting, P.I.D automatic calculation, dry and wet bulb automatic correction

Model		DR-H201/22/40
System		Balance temperature and humidity control system(BTHC)
Volume		22L
Load capacity		20KG
Inner dimension W×H×D mm		300×300×250
External dimension W×H×D mm		440×740×780
Temperature Performance	Temperature range	-40～＋150℃
	Temperature fluctuation	±0.3°C
	Temperatrue unifomity	2.5°C
	Temperature change rate	Heating rate：3.0°C/min Cooling rate：1.0°C/min
	Extreme temperature arrival time	Heating time：from -40 ＋150℃ 60 min Cooling rate：+20 to -40°C 50 min
	Allowable heat load	Temperature of test area+20°C ， 300 W
Humidity performance	Humidity range	30～95%rh
	Humidity fluctuation	±3.0%rh
	Allowable heat load	Test area conditions：+85℃ / 85%rh 300W
Strcurure	External material	1.5mm thick FC advanced electrolytic plate + spray anti-corrosion
	Internal material	1.2mm thick SUS304 stainless steel
	Water supply system (standard configuration)	Automatic water supply
	Water tank(Optional)	8 L
	Refrigerantion system	Mechanical single-stage compression cooling
	Compressor	Full-Closed Compressor
	Refrigerant	R-404A [R-449A available on request]
	Power	0.65 kW
	Extension mechanism	Electronic expansion valve
Noise level		60dB

Q: What is a desktop constant temperature and humidity test chamber?
A: It is a compact environmental testing device used to simulate precise temperature and humidity conditions for testing small products or samples.
Q: How does it control temperature and humidity?
A: It uses a refrigeration system for cooling, heaters for heating, and a humidification/dehumidification system to maintain specific humidity levels.
Q: What are its typical applications?
A: Commonly used for testing electronics, pharmaceuticals, batteries, materials, and cultural relics in research labs and production lines.
Q: What is the standard temperature range?
A: Typically -20°C to +150°C, with some models offering -40°C to +180°C.
Q: What humidity range can it achieve?
A: Generally 20% to 98% RH, with some models supporting 10% to 98% RH.
Q: How accurate is the temperature control?
A: Usually ±0.5°C or better at stable state.
Q: What about humidity control accuracy?
A: Typically ±2.5% RH or better.
Q: What power supply does it require?
A: Most models operate on standard AC 220V/50Hz or 110V/60Hz power.
Q: How much space does it need?
A: As a desktop unit, it typically requires less than 1m² of bench space.
Q: What interface options are available?
A: Most modern units feature touchscreen controls and support USB/RS485/Ethernet connectivity.
Q: How often should it be calibrated?
A: Recommended annually or every 6 months for critical applications.
Q: What maintenance does it require?
A: Regular cleaning of filters, checking refrigerant levels, and cleaning humidity sensors.
Q: Can it program complex test cycles?
A: Yes, most models support multi-segment programming for complex temperature/humidity cycles.
Q: What safety features are included?
A: Typically include over-temperature protection, dry burning protection, and compressor delay protection.
Q: How to choose the right model?
A: Consider sample size, required temperature/humidity range, accuracy needs, and available bench space.