Programmable high and low temperature test chamber

National standard for programmable high and low temperature test chambersBox material:

Outer box material: A3 steel plate,Surface phosphating electrostatic spraying

Inner box material: SUS304 stainless steel 2B grade light plate

Insulation material: Ultra thin and ultra-fine glass fiber

Door frame insulation: double-layer high and low temperature aging resistant silicone rubber door sealing strip

1、 Definition and core functions

Definition: A programmable high and low temperature test chamber is a temperature environment testing device controlled by a microprocessor program.

Core function: It can automatically execute complex temperature change curves through pre-set multi-stage programs, including heating, cooling, and constant temperature residence, and can run cyclically. The core lies in "program control" and "automatic operation".

2、 Core Systems and Technologies

1. Refrigeration system

Refrigeration method: mechanical compression refrigeration.

Refrigeration cycle:

Single stage compression refrigeration: suitable for standard temperature range (such as -20 ℃~+150 ℃).

Cascade compression refrigeration: used to expand the low-temperature range (such as -40 ℃, -70 ℃, -80 ℃). Two independent high-temperature and low-temperature refrigeration cycles are coupled through a cascade heat exchanger.

Core components:

Compressor: Adopting brand semi closed or fully closed compressors.

Condenser: air-cooled (common) or water-cooled (efficient).

Evaporator: finned heat exchanger.

Throttle device: capillary tube or thermal expansion valve.

2. Heating system

Method: Using nickel chromium alloy resistance wire heater, usually installed in the air duct.

Control: Solid state relays are used for PID regulation to achieve contactless continuous or proportional control.

3. Air circulation system

Composition: Composed of a centrifugal fan, a driving motor, and an air duct.

Function: Force air flow inside the box to ensure temperature uniformity.

4. Control system (core)

Controller: dedicated programmable temperature controller or industrial touch screen+PLC combination. This is the key to achieving 'programmable' functionality.

Control algorithm: PID (Proportional Integral Derivative) control algorithm is adopted, which has self-tuning function and can automatically optimize control parameters.

Programming function:

Multi segment program: Multiple programs can be set, each program can contain up to tens or even hundreds of segments.

Segment settings: Each segment can independently set target temperature, operating time, and slope (heating/cooling rate).

Loop function: supports loop within program segments and link loop between programs.

Interface and Communication: USB, RS-232, or RS-485 interfaces are standard for program transmission, data recording, and remote monitoring.

5. Sensors

Temperature: Pt100 platinum resistor.

3、 Main technical parameters

1. Temperature parameters

Temperature range: e.g. -70 ℃~+150 ℃ (depending on refrigeration configuration).

Temperature fluctuation: ≤± 0.5 ℃ (in a stable state).

Temperature uniformity: ≤ 2.0 ℃ (in a stable state).

Heating and cooling rate:

Average speed: 1 ℃~3 ℃/min (average throughout the entire process). This is a non-linear temperature change, and the device executes according to the slope set by the program.

2. Structural parameters

Inner box material: SUS304 stainless steel.

Outer box material: cold-rolled steel plate sprayed or SUS304 stainless steel.

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

Observation window: multi-layer hollow electric heating anti fog glass.

Test lead hole: standard for the box.

4、 Performance and reliability analysis

1. Program control performance

Program followability: The ability of the device's actual temperature curve to track the program's set curve. High performance controllers can reduce tracking errors and accurately reproduce preset temperature profiles.

Overshoot control: During temperature range transition, the control system should be able to effectively suppress temperature overshoot and ensure the rigor of testing conditions.

2. Temperature performance

Uniformity and fluctuation: are core indicators for measuring the design and manufacturing process of box foundations, directly affecting the comparability and accuracy of test results.

3. Long term operational stability

The equipment needs to have the reliability to run continuously for weeks or even months under program control. The quality of core components and the stability of the control system are key.

4. Data recording and traceability

The equipment should be able to fully record the entire operating time, temperature settings, actual values, and equipment status, support data export, and meet the traceability requirements of the quality system.

5. Security protection system

Electrical safety: overload, leakage, and short circuit protection.

System Safety: Compressor Overpressure/Overheating/Overcurrent Protection, Heater Overheating Protection, Workshop Independent Overtemperature Protector.

Program safety: power-off protection function, can automatically resume operation or start safely after power on.

Programmable high and low temperature test chamberTemperature range:

Temperature range: -20~+150 ℃ -40~+150 ℃ -60~+150 ℃ -70~+150 ℃ and other different levels of test temperature requirements.

Temperature fluctuation: ≤± 0.5 ℃ (can be increased to 0.1 ℃ according to user needs)

Temperature uniformity: ≤± 2 ℃ (can be increased to 0.5 ℃ according to user needs)

Humidity range: 30% to 98% R.H (can be customized according to customer requirements)

Humidity error: ≤+2%/-3% R.H

Heating time: 2-3 ℃/min (can be increased to above 10 ℃ according to user needs)

Cooling time: 0.7-1 ℃/min (can be increased to above 10 ℃ according to user needs)

Noise: (dB) ≤ 65

Programmable high and low temperature test chamberExecution standard:

GB2423.1-93 Basic Environmental Testing Procedures for Electrical and Electronic Products - Test A: Low Temperature Test Method

GB2423.2-93 Basic Environmental Testing Procedures for Electrical and Electronic Products - Test B: High Temperature Test Method

GB2423.3-93 "Basic Environmental Testing Procedures for Electrical and Electronic Products" Test Ca: Constant Damp Heat Test Method

Purpose: This product is suitable for testing the adaptability of electrical, electronic, instrumentation, and other products, components, and materials to complex high and low temperature humid and hot environments during storage, transportation, and use.

Technical specifications (note: size can be customized according to your requirements):

National standard for programmable high and low temperature test chamberscontrol system

1. The JCD-33A intelligent digital display regulator developed by Shinko Corporation in Japan is a practical, high-performance, and cost-effective intelligent regulator,The accuracy level of the instrument is 0.3,Sampling period 250ms. With free input,PID self-tuning,Dual circuit output,Dual set values,Multiple alarms,Manual output and other functions.

Free input: Users can freely select 10 types of thermocouples (K, J, R, S, B, E, T, N, PL-II, C [W/Re5-26]) and 2 types of thermal resistors (Pt100, JPt100) through the operation keys.

Kind Reminder:

The quotation for this product is for reference only and is intended for online display purposes.

The specific specifications and prices of the product are mainly based on our company's sales quotation.