24V 1/2" X 1/2" STANDING PILOT STRA
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10k ohm, 4-wire, Class A, B, C and D Non-Indicating temperature sensor
It then converts the measurement to a digital output
It can be a thermocouple which changes voltage with temperature or a K-type thermistor which changes resistance with temperature
This is an example of a very simple product description on Amazon
The sensor is the unit that measures temperature or pressure
The Robertshaw 2703-021 Temp Sensor (Room) is used in conjunction with the temp sensor, a room thermostat or HVAC control to monitor temperature conditions within the conditioned space
ROBERTSHAW 2703-021 TEMP SENSOR ROOM MT 10 KOHM
HONEYWELL TEMPERATURE SENSOR 10KOHM
100 Ohms resistance between B and C terminals
2 Ohms resistance between C and D terminals
ROBERTSHAW
MOUNTING MTWS 2703-021
ROBERTSHAW 2703-021 TEMP SENSOR ROOM MT 10 KOHM - 1 each
10K Ohm Resistance between A and B terminals