High and low temperature constant temperature test chamber

The high and low temperature constant temperature test chamber achieves precise constant temperature control within the set temperature range through the collaborative work of precision refrigeration system, heating system, and control system. Equipment selection should focus on core parameters such as temperature range, uniformity, and fluctuation, while also paying attention to the safety protection function and long-term operational stability of the equipment.

1、 Core technology system

1. Structural system

Studio material: SUS304 stainless steel plate, thickness 1.2mm

Shell material: cold-rolled steel plate with double-layer epoxy resin spray coating

Insulation layer: high-density glass fiber cotton, thickness 100mm

Sealing design: High and low temperature resistant silicone rubber double-layer sealing strip

Observation window: Three layer vacuum electric heating film anti frost glass

Test hole: 50mm diameter, with sealing plug

Cable interface: Waterproof gland head

2. Refrigeration system

Refrigeration method: mechanical compression refrigeration

Circulating system:

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

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

Compressor: Semi closed piston compressor

Condenser: air-cooled finned heat exchanger

Evaporator: Copper tube aluminum fin heat exchanger

Throttle device: thermal expansion valve+solenoid valve

Refrigerant: R404A/R23 (cascade system)

3. Heating system

Heating element: Nickel chromium alloy electric heating wire

Installation method: Stainless steel protective sleeve

Control mode: SSR solid-state relay regulation

Safety protection: Fused over temperature protection

4. Air circulation system

Fan type: Multi blade centrifugal fan

Motor power: 90W

Blade diameter: 200mm

Wind speed: adjustable from 0.5-1.5m/s

5. Control system

Main controller: Japan U-Easy Control UMC1200

Display interface: 7-inch color touch screen

Temperature sensor: PT100 platinum resistor

Control mode: PID+SSR control

Program capacity: 120 sets of programs, with 100 segments per set

Communication interface: USB, RS-485

Data recording: Built in storage, supports USB drive export

2、 Technical parameters

1. Temperature parameters

Temperature range: -70 ℃ to+150 ℃

Temperature fluctuation: ± 0.5 ℃

Temperature uniformity: ± 2.0 ℃

Heating time:+25 ℃ →+150 ℃ ≤ 45 minutes

Cooling time:+25 ℃ → -70 ℃ ≤ 90min

2. Structural parameters

Inner box size: 400 × 400 × 400mm (64L)

Outer box size: 950 × 1050 × 1550mm

Power supply voltage: AC220V ± 10% 50Hz

Maximum power: 4.5kW

Weight: Approximately 280kg

3、 Performance indicators

1. Temperature performance

Stability: Continuous operation for 24 hours, temperature fluctuation ≤ 0.5 ℃

Uniformity: 9-point test in workspace, temperature difference ≤ 2.0 ℃

Accuracy: The deviation between the displayed value and the measured value is ≤± 1.0 ℃

2. Reliability indicators

Average time: ≥ 5000 hours

Compressor lifespan: ≥ 50000 hours

Continuous operation capability: ≥ 720 hours

3. Security protection system

Electrical safety:

Leakage protection switch

Overcurrent protector

short circuit protection

Equipment safety:

Compressor overheat protection

Compressor overcurrent protection

Fan overload protection

Cooling fan interlock protection

Sample safety:

Independent over temperature protector

Temperature upper limit protection

Temperature lower limit protection

4、 Manufacturing and Inspection Standards

1. Design standards

GB/T 10592-2008 Technical Conditions for High and Low Temperature Test Chambers

IEC 60068-2-1 Test A: Low Temperature

IEC 60068-2-2 Test B: High Temperature

2. Inspection items

Insulation resistance test: ≥ 2M Ω

Voltage endurance test: 1500V/10mA/60s

Leakage current test: ≤ 3.5mA

Grounding resistance test: ≤ 0.1 Ω

Temperature performance test (empty/full load)

Security protection function verification

5、 Environmental requirements for use

Environmental temperature:+5 ℃~+35 ℃

Environmental humidity: ≤ 85% RH

Power supply fluctuation: ± 10% of rated voltage

Ventilation requirement: A space of ≥ 500mm around the equipment

Ground bearing capacity: ≥ 500kg/m?