Cold Temperature Test Chamber

The cold temperature test chamber can be used to assess and determine the adaptability of electrical and electronic products or materials to storage and use under temperature cycling conditions and low temperature conditions on the product surface. The equipment uses forced air circulation to maintain the uniformity of the temperature in the workroom. To limit the influence of radiation, the difference between the temperature of each part of the inner wall of the equipment and the temperature specified in the test is not greater than 8%, and the test sample will not be directly radiated by the heating and cooling elements in the equipment.

The refrigeration cycle of the cold temperature test chamber adopts the reverse Carroll cycle, which consists of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, consuming work to increase the exhaust temperature, and then the refrigerant isothermally exchanges heat with the surrounding medium through the condenser to transfer heat to the surrounding medium. The refrigerant then adiabatically expands through the shut-off valve to do work, and the refrigerant temperature decreases at this time. Finally, the refrigerant isothermally absorbs heat from the object with a higher temperature through the evaporator, lowering the temperature of the cooled object. This cycle repeats itself to achieve the purpose of cooling.

The cold temperature test chamber is machined by CNC machine tools, with beautiful appearance and non-reaction handles for easy operation. The inner shell of the chamber is made of imported high-grade stainless steel (SUS304) mirror panel, and the outer shell is made of A3 steel plate sprayed with plastic, which increases the appearance texture and cleanliness.
The large observation window with lighting keeps the chamber bright, and the embedded tempered glass in the heating element allows clear observation of the chamber conditions at any time. It is equipped with a test hole with a diameter of 50mm, which can be used for external test power cord or signal line.

The temperature control uses Japanese RKC digital touch buttons, touch settings, digital and direct display, and the temperature control output power is calculated by P.I.D microcomputer to achieve high precision and high efficiency of electricity use. If an error occurs, a warning signal will be provided.
The refrigerator of the cold temperature test chamber uses the French original "Taikang" fully enclosed compressor.
The dry filter, refrigerant flow window, repair valve, oil separator, solenoid valve, and liquid storage cylinder are all imported original parts
The refrigeration system adopts a unit or binary low-temperature circuit system design.
The low-temperature test chamber uses a multi-wing blower to circulate the air strongly, avoiding any dead corners, and can make the temperature distribution in the test area uniform.
The air circulation outlet and return air design, the wind pressure and wind speed meet the test standards, and can make the temperature return to normal quickly when the door is opened.
Heating, cooling, and the system are completely independent, which can improve efficiency, reduce testing costs, increase life, and reduce failure rates.
Overall equipment over-temperature; overall equipment phase loss/reverse phase; overall equipment overload; refrigeration unit overpressure; overall equipment timing;
Other protections include leakage, operation indication, automatic shutdown after fault alarm, etc.

Cold temperature test chamber must not be used for testing the following objects or objects containing these objects:
(I) Explosives:
1. Nitroglycol (ethylene glycol dinitrate), nitroglycerin (propylene glycol trinitrate), nitrocellulose and other explosive nitrates.
2. Trinitrobenzene, trinitrotoluene, trinitrophenol (picric acid) and other explosive nitro compounds.
3. Peracetic acid, methyl ethyl ketone peroxide, benzoyl peroxide and other organic peroxides.
(II) Combustibles:
1. Self-igniting materials:
Metals: "lithium", "potassium", "sodium", yellow phosphorus, phosphorus sulfide, red phosphorus.
Celluloid: calcium carbide (calcium carbide), lime phosphide, magnesium powder, aluminum powder, sodium bisulfite.
2. Oxide properties:
(1) Potassium chlorate, sodium chlorate, ammonium chlorate and other chlorates.
(2) Potassium peroxide, sodium peroxide, ammonium peroxide and other peroxide salts.
(3) Potassium peroxide, sodium peroxide, barium peroxide and other inorganic peroxides.
(4) Potassium nitrate, sodium nitrate and other nitrates.
(5) Potassium hypochlorite and other hypochlorites.
(6) Sodium chlorite and other chlorites.
(III) Flammable materials:
(1) Ether, gasoline, propylene oxide, carbon disulfide and other substances with a flash point of less than -30°C.
(2) Ordinary ethane, ethylene oxide, acetone, benzene, methyl ethyl ketone and other substances with a flash point above -30°C and below 0°C.
(3) Methanol, ethanol, xylene, amyl acetate and other substances with a flash point above 0°C and below 30°C.
(4) Kerosene, light oil, turpentine, isoamyl alcohol, acetic acid and other substances with a flash point above 30°C and below 65°C.
(IV) Combustible gases:
Hydrogen, acetylene, ethylene, methane, ethane, propane, butane and other gases that may burn at 15°C and 1 atmosphere.

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