HVAC Temperature Sensor
An HVAC (Heating, Ventilation, and Air Conditioning) temperature sensor, also known as a thermostat, is a device used to measure and control the temperature in a heating or cooling system. It is a crucial component in HVAC systems as it provides feedback to the system and enables it to maintain a desired temperature.
Here's how an HVAC temperature sensor typically works:
1. Temperature Measurement: The sensor measures the ambient temperature in the space where it is installed. It can be either a simple bi-metallic strip, a thermistor (a type of resistor whose resistance changes with temperature), or a more advanced electronic sensor like a thermocouple or a resistance temperature detector (RTD).
2. Comparison and Control: The sensor compares the measured temperature with the desired temperature set by the user. If the measured temperature deviates from the setpoint, it sends a signal to the HVAC control system.
3. HVAC System Response: Based on the input from the temperature sensor, the HVAC control system determines the appropriate action to adjust the heating or cooling output. It may activate or deactivate the heating or cooling equipment, adjust the speed of fans or dampers, or open/close valves to regulate the temperature.
4. Feedback Loop: The temperature sensor continuously monitors the temperature, providing feedback to the HVAC control system. The system adjusts the output accordingly to maintain the desired temperature within a certain range.
Types of HVAC temperature sensors:
Bi-metallic strip: Consists of two different metal strips bonded together, which bend with temperature changes and trigger a switch.
Thermistor: A temperature-sensitive resistor that changes its resistance based on temperature.
Thermocouple: A device that generates a small voltage proportional to the temperature difference between two junctions of different metals.
Resistance Temperature Detector (RTD): A type of temperature sensor that measures resistance changes in a wire or element as the temperature varies.
Resistance: R37ºC=58KΩ±0.1ºC
Beta Value: B25/50=4200K±1%
Probe: Drop Maxφ2.0 Black
Wire: Enamelled wire φ3.0 Red + PVC round theathed wire 26AWG*4C(7/0.16TS, ID1.1 Black, Red, Yellow, Green) OD4.0 Grey.
Length: (30±2-3Sn)+(1500±15-3Sn)
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