High and low temperature test chamber

The technical level of the high and low temperature test chamber is determined by the configuration of the refrigeration system, control accuracy, and structural design. The selection should comprehensively consider the temperature range, uniformity index, and reliability requirements to ensure that the equipment performance matches the testing requirements accurately.

1、 Core system composition

1. Structural system

Inner box material: SUS304 stainless steel plate

Outer box material: Cold rolled steel plate with electrostatic spraying or SUS304 stainless steel

Insulation material: high-density glass fiber cotton or polyurethane foam

Insulation layer thickness: 80-150mm

Sealing structure: high and low temperature resistant silicone rubber sealing strip

Observation window: multi-layer hollow electric heating frost proof glass

2. Refrigeration system

Refrigeration method: mechanical compression refrigeration

Refrigeration cycle:

Single stage compression refrigeration (0 ℃~-40 ℃)

Cascade compression refrigeration (-40 ℃~-80 ℃)

Core components:

Compressor: Semi closed/Fully closed type

Condenser: air-cooled/water-cooled

Evaporator: finned heat exchanger

Throttle device: thermal expansion valve/capillary tube

3. Heating system

Heating element: Nickel chromium alloy electric heating wire

Layout method: Installation inside the air duct

Control method: Solid state relay PID regulation

4. Air circulation system

Fan type: Multi blade centrifugal fan

Drive motor: Long axis motor

Air duct structure: vertical/horizontal circulation

5. Control system

Controller type:

Programmable temperature controller

Touch screen+PLC combination

Control algorithm: PID control (with self-tuning)

Programming function:

Multi segment program configuration

loop operation

Slope control

Communication interface:

RS-232/485

Ethernet

USB

2、 Main technical parameters

1. Temperature parameters

Temperature range:

Standard type: -40 ℃ to+150 ℃

Expansion type: -70 ℃ to+150 ℃

Temperature fluctuation: ≤± 0.5 ℃

Temperature uniformity: ≤ 2.0 ℃

Heating and cooling rate: 1-5 ℃/min (average rate)

2. Structural parameters

Internal volume: 80L-1000L (standard series)

Internal dimensions: customized according to volume

Load bearing capacity: ≥ 50kg (standard type)

3、 Performance indicators

1. Temperature performance

Stability: Continuous operation fluctuation meets the requirements

Uniformity: Temperature difference at each point in the workspace ≤ 2.0 ℃

Followeability: The deviation between the program curve and the actual curve is ≤± 2 ℃

2. Reliability indicators

Average time: ≥ 3000 hours

Compressor lifespan: ≥ 50000 hours

Continuous operation capability: ≥ 720 hours

3. Safety performance

Electrical protection: overload, leakage, short circuit protection

System protection:

Compressor overpressure/overheat protection

Heater overheat protection

Independent over temperature protector

Emergency protection: power-off protection, emergency stop

4、 Manufacturing and Inspection

1. Design standards

GB/T 10592-2008

IEC 60068-2-1

IEC 60068-2-2

2. Inspection items

Temperature deviation detection

Temperature fluctuation detection

Temperature uniformity detection

Verification of heating and cooling rate

Security protection function testing

Continuous operation test

5、 Key selection points

1. Basis for technical selection

Testing standard requirements

Sample size and weight

Temperature change rate requirement

Accuracy level requirements

2. Configuration selection

Compressor brand grade

Controller type

cooling method

Optional accessories

Manufacturer's use of high and low temperature alternating humidity test chamber:

Suitable for testing the performance indicators of electrical, electronic, aerospace, automotive components, and various electronic components in high temperature, low temperature, or alternating humid and hot environments.

Compliant with standards:

Complies with standards such as GB/T2423.1 Low Temperature Test Method, GB/T2423.2 High Temperature Test Method, GB/T2423.3 Constant Damp Heat Test Method, GB/T2423.4 Alternating Damp Heat Test Method, GB/T10592 High and Low Temperature Test Technical Conditions, GB/T10586 Damp Heat Test Technical Conditions, GJB150.3 High Temperature Test, GJB150.4 Low Temperature Test, etc.

Test box specifications

☆ Model TH-80 internal dimensions D × W × H 400 × 400 × 500

☆ Model TH-225 Internal dimensions D × W × H 500 × 600 × 750

☆ Model TH-500 Internal dimensions D × W × H 700 × 800 × 900

☆ Model TH-800 internal dimensions D × W × H 800 × 1000 × 1000

☆ Model TH-1000 Internal dimensions D × W × H 1000 × 1000 × 1000

Refrigeration system:

☆ Compressor: Fully enclosed original French Taikang.

☆ Cooling method: single (double) mechanism cooling.

☆ Condensation method: forced air cooling.

☆ Dehumidification adopts the evaporator coil dew point temperature laminar contact dehumidification method.

The solenoid valve, oil separator, drying filter, repair valve, refrigerant flow window, and storage tank are all imported original parts.

Technical Specifications:

☆ Temperature range: -20 ℃~150 ℃, -40 ℃~150 ℃, -60 ℃~150 ℃, -70 ℃~150 ℃

☆ Humidity range: 30%~98% R.H (temperature between 25 ℃~80 ℃)

☆ Temperature fluctuation: ≤± 0.5 ℃

☆ Temperature uniformity: ≤± 2 ℃

☆ Humidity fluctuation:+2%, -3% R.H

☆ Heating rate: 1.0-3.0 ℃/min

☆ Cooling rate: 0.7-1.2 ℃/min

☆ Humidity fluctuation range: 40% to 98% R.H

Time setting range: 0-9999h

☆ Power supply voltage: AC380V/50HZ

The inner liner is made of imported mirror stainless steel plate (SUS304).

The outer shell is processed and formed using A3 steel plate CNC machine tools, and the surface of the shell is sprayed with plastic for a smoother and more beautiful appearance.

☆ High density glass fiber cotton is selected as the insulation material, with a thickness of 100mm/120mm.

The observation window is made of multi-layer hollow tempered glass, equipped with lighting fixtures, and the inner adhesive sheet conductive film is heated and defrosted to observe the test process clearly.

A double-layer high temperature resistant sealing strip is used between the door and the box to ensure the sealing of the testing area.

The temperature cycling system adopts a temperature resistant low-noise air conditioning motor and a multi blade centrifugal fan.

The bottom of the machine adopts a fixed PU movable wheel for easy movement. On the left side of the box, there is a Φ 50mm test hole that can be used for external testing power or signal lines. Any increase in the diameter or number of holes should be explained.

Security protection system:

Protection measures include overall equipment overheating, refrigeration system overload, refrigeration system overpressure, electrical leakage, water shortage, operation indication, automatic shutdown after fault alarm, etc.

Equipment usage conditions:

☆ Environmental temperature:5℃～30℃, environmental humidity: ≤85%R.H.

☆ Place the machine in front, back, left, right, and right directions80Do not place anything in centimeters.

☆ Free home delivery, and after the installation and debugging of the equipment is completed, relevant technical personnel will receive basic operation training.

Manufacturer of high and low temperature alternating humidity test chamberControl system:

☆ ImportedTEMI880The LCD touch display screen is programmable, easy to edit programs, and easy to operate on the screen.

☆ Accuracy:0.1Resolution: ±0.1℃, temperature sensor:PT100Platinum resistance thermometer.

☆ It has the function of automatic calculation, which can immediately correct the temperature and humidity change conditions, making temperature and humidity control more accurate and stable.

The controller operation interface is available in both Chinese and English, and the real-time operation curve chart can be displayed on the screen.

After inputting the data and experimental conditions, the controller has a screen lock function,Avoid stopping the machine due to human touch.

The controller has an automatic screen saver function, which better protects the LCD screen and prolongs its lifespan during long-term operation.

☆ Has100Group program, each group100Segments, each segment can be looped999The capacity of the steps is set to a maximum value of at each time interval99h59min.

☆ HasRS-232orRS-485Remote communication interface, which can be programmed on a computer to monitor the testing process and perform functions such as automatic power on/off.

Heating and humidification system:

☆ High temperature, low temperature, humid heat * independent system, using far-infrared nickel alloy high-speed heating electric heater.

The external boiler steam humidifier has energy-saving and consumption reducing functions, and has automatic water level compensation.