High/Low Temperature Shock Test Chamber

Product Name

High/low temperature shock test chamber / temperature shock test chamber / thermal shock test chamber

Application

This product is suitable for safety performance testing of electronic components, providing reliability tests and product screening tests. Testing with this equipment also improves product reliability and enables product quality control.

Chamber Structure

• Computer control: all functions are computer-controlled with self-developed software and a good operating interface, making operation and monitoring simpler and more intuitive; the hold function can keep the running program at its current state, the values of the current program section can be temporarily changed, time parameters can be set on screen, and cooling, heating and basket-lift transfer switching are performed automatically according to the set values.
• Independent control: the cold box and hot box are controlled independently and their doors are independent of each other, expanding the application range of the test chamber (one chamber, three uses).
• Insulation: the insulation performance of the product is fully guaranteed.
• Safety interlock: the chamber door is interlocked with the circulation fan and the basket-lift drive to protect the operator; once the door is opened, the power of the circulation fan and basket-lift drive is automatically cut off.
• Cable entry ports: standard cable entry ports on the chamber top allow convenient introduction of sensor wires, test cables and other leads into the chamber.

Control System

• Controller: the main controller is an imported Japanese “OYO” dual-circuit high-precision LCD touch-key temperature controller. It uses an LCD touch screen to display set parameters, test curves, running time and heater working status, and features PID auto-tuning.
• Human-machine dialogue: control programs are edited through human-machine dialogue; only the temperature needs to be set to achieve automatic operation of the refrigerator. The control system has complete detection devices with detailed automatic fault display and alarm, and is equipped with an RS-485 communication interface and operation software.
• Accuracy and programs: setting accuracy: temperature 0.1°C, time 1 s; user program capacity: 10 × 99 sections; operation modes: program operation and constant operation; independent over-temperature protection instrument; cumulative equipment running-time timer.
• Transfer and recovery: transfer time between the low-temperature zone and the high-temperature zone is no more than 15 seconds; temperature recovery time is no more than 5 minutes.

Refrigeration System

Refrigeration system and compressor of the thermal shock test chamber: to meet the cooling-rate and minimum-temperature requirements, the chamber adopts a two-stage cascade air-cooled refrigeration system composed of imported fully hermetic French compressors. The cascade refrigeration system includes a high-temperature refrigeration circuit and a low-temperature refrigeration circuit; the connecting vessel is the evaporative condenser, which also serves as an energy-transfer device, carrying heat from the working chamber out through the two-stage refrigeration system to achieve cooling. The refrigeration system design applies energy-regulation technology, an effective approach that ensures normal operation of the refrigeration unit while effectively regulating energy consumption and cooling capacity, bringing the operating cost and failure rate of the refrigeration system down to a more economical level.

• Refrigeration principle: both the high- and low-temperature circuits use the reverse Carnot cycle, consisting of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed by the compressor to a higher pressure, with work consumed raising the discharge temperature; the refrigerant then exchanges heat isothermally with the surrounding medium through the condenser, transferring heat to the surroundings; the refrigerant then does work through adiabatic expansion via the valve, and its temperature drops; finally the refrigerant absorbs heat isothermally through the evaporator from warmer objects, lowering the temperature of the cooled objects. This cycle repeats continuously to achieve cooling.
• Refrigerant: DUPONT R404A (high-temperature circuit) and R23 (low-temperature circuit).
• Auxiliary components: expansion valve (US SPORLAN), solenoid valve (Italy CASTEL), filter (US SPORLAN), pressure controller (UK/US RANCO), oil separator (Europe/US ALCO) and other refrigeration accessories are all imported parts.

Standards

GB/T 2423.1, GB/T 2423.2, GB 10592-89, GJB 150