How does the constant temperature and humidity tester rise and fall and the temperature rise and fall control device
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This testing machine is used to evaluate the performance and parameters of electrical, electronic, and other products or materials after exposure to high temperature, low temperature, alternating damp heat, or constant temperature environments. It simulates real-world conditions to ensure that products can withstand various environmental stresses.
The heating system in a constant temperature and humidity tester plays a crucial role in achieving the desired temperature. When the controller receives a heating command, it sends a voltage signal to the relay, which then applies around 3-12 VDC to the solid-state relay. This effectively connects the AC circuit, causing the contactor to engage and apply voltage to the heater. The fan circulates the heat inside the chamber, allowing the temperature to rise quickly to the set point. The controller regulates the solid-state relay to control the heat output, enabling precise temperature management on the display. For temperatures above 89°C, this method works efficiently. However, for more stable control below 89°C, programmable models use a combination of solid-state relay heating and a compressor-based refrigeration cycle to maintain balance and stability.
Cooling is an essential part of a programmable constant temperature and humidity testing machine. The cooling system consists of four main components: the compressor, condenser, expansion valve, and evaporator. The compressor is the core of the refrigeration system, drawing in low-temperature, low-pressure gas and compressing it into high-temperature, high-pressure gas. This gas then releases heat through the condenser, turning into a liquid. The cooled liquid passes through the expansion valve, reducing its pressure, and then enters the evaporator. In the evaporator, it absorbs heat from the chamber, changing back into a low-temperature, low-pressure gas before returning to the compressor. This continuous cycle ensures effective cooling and maintains the desired environmental conditions.
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Real shot picture of constant temperature and humidity test machine
