This is an ambient temperature sensor with a 1000 Ohm, 2 wire, Ni 1000 RTD - temperature rating up to 125 deg F

Features:

• Sensing element: Nickel, 1000 Ohm, 2-wire
• Operating temperature: -58 to 158 °F [-50 to 70 °C]
• Weather head: Integral, hole for M16 connection
• Primary use: Ambient air temperature sensor for LMV52 / RWF40 / RWF55

Please Note: QAC22 is the direct replacement for QAC2020U

Resources:

• QA Temperature Sensor Technical Literature

Also See From Siemens LMV5 System:

Burner Controls Touch screens Actuators

Flame Sensors Other Accessories