Original Atlas Copco 1622550781 Thermostat 40c for oil injected screw comprssor

I. Atlas Copco air compressor's 40°C thermostat Core Function

Temperature Monitoring and Response: Real-time detection of the temperature at the target location. When the temperature rises to 40°C, it precisely triggers control instructions (such as connecting / disconnecting circuits).

System Protection: Prevents the equipment from overheating locally (above the 40°C threshold) due to which the lubricating oil viscosity decreases, sealing components age faster, or compression efficiency drops.

Energy Efficiency Adjustment: Starts the cooling system in advance when the temperature approaches 40°C to avoid significant temperature fluctuations and reduce energy waste.

II. Atlas Copco air compressor's 40°C thermostat Working Principle

The 40°C thermostat is usually controlled based on the physical characteristic changes of the temperature-sensing element:

Mechanical Type: Utilizes the bending deformation of a bimetallic strip (two metals with different thermal expansion coefficients adhered together) in response to temperature changes, pushing the contacts to close (such as when the temperature rises to 40°C, the bimetallic strip bends, causing the contacts to close, activating the cooling device).

Electronic Type: Uses a thermistor (PTC/NTC) or thermocouple to sense the temperature, transmitting the signal to the control chip. When 40°C is detected, the chip issues an instruction to control the relay to act.

Comparison: The mechanical type has a simple structure and low cost, suitable for scenarios with relatively stable environments; the electronic type has higher precision (±1-2°C), can integrate communication functions (such as interfacing with the air compressor PLC), and is suitable for intelligent control requirements.

III.Atlas Copco air compressor's 40°C thermostat Typical Application Scenarios

In air compressors, the installation location and function of the 40°C thermostat correspond:

Lubricating Oil Path: Monitors the lubricating oil temperature. When the oil temperature rises to 40°C, it activates the oil cooler (such as the fan of a wind-cooled radiator) to prevent the lubricating oil from failing due to high temperature (the optimal working temperature of the air compressor lubricating oil is generally 40-60°C).

Post-treatment of Compressed Air: In auxiliary equipment such as refrigerated dryers, it is used to control the outlet temperature of the cooler to ensure that the compressed air enters the drying process below 40°C, improving water removal efficiency.

Motor or Shell: Monitors the temperature of the motor winding or the surface of the shell. When 40°C is reached, it activates the cooling fan to prevent the motor from overheating (especially for small air compressors or in environments with high temperatures).

IV. Key Parameters and Selection

Action Temperature: The core parameter is "40°C trigger", it is necessary to confirm whether it is "normally closed type" (closed when 40°C) or "normally open type" (open when 40°C), matching the control logic.

Rated Voltage / Current: Select based on the load (such as fans, solenoid valves), common specifications are AC 220V/10A, DC 24V/5A, avoiding overload burnout.

Temperature Sensing Range and Precision: The working temperature range needs to cover the actual operating conditions of the air compressor (such as -10~80°C), the precision is recommended to be within ±2°C to ensure reliable control.

Protection Grade: When installed in a humid, oil-laden environment, select IP54 or higher protection (such as sealing treatment of the housing), to prevent short circuits.

Installation Method: Directly screw into the temperature measurement point, use a clip for fixation or surface mounting (surface temperature measurement), it needs to match the equipment structure.