Siemens QAE2174.015 Immersion Temperature Sensor – 4–20 mA Output, 150 mm Probe, −10 to +120°C

General
The Siemens QAE2174.015 is an active immersion temperature sensor designed to measure water temperature in pipes and tanks used in heating, ventilation and air-conditioning (HVAC) systems. It is suitable for controlling or limiting flow temperature, limiting return temperature and monitoring domestic hot water (DHW) temperature.

The sensor provides a 4–20 mA output signal through a 2-wire connection, allowing integration with compatible HVAC controllers and building management systems. It features a 150 mm immersion probe and is supplied with a clamp for installation in a compatible protection pocket.

Features
- Active immersion temperature sensor for liquid temperature measurement.
- 4–20 mA DC output signal.
- 2-wire electrical connection.
- 150 mm immersion probe.
- Temperature measuring range: −10 to +120°C.
- Stainless-steel immersion tube.
- 13.5–35 V DC operating supply.
- Supplied with clamp for protection pocket.
- Suitable for HVAC flow, return and domestic hot water temperature monitoring.
- Designed for building automation and temperature control applications.

Key Specifications
- Brand: Siemens
- Model: QAE2174.015
- Manufacturer Part Number: BPZ:QAE2174.015
- Product Series: Symaro
- Product Type: Active immersion temperature sensor
- Temperature Measuring Range: −10 to +120°C
- Temperature Output: 4–20 mA DC
- Electrical Connection: 2-wire
- Operating Voltage: 13.5–35 V DC
- Power Consumption: Maximum 1 VA
- Measurement Accuracy: ±1 K (0 to 70°C); ±1.4 K (−10 to +120°C)
- Immersion Length: 150 mm
- Time Constant: Approximately 30 seconds with protection pocket
- Protection Rating: IP54
- Protection Class: Class III
- Immersion Tube Material: Stainless steel
- Electrical Connection: Screw terminals
- Housing Material: Polycarbonate
- Dimensions (W × H × D): 80 × 88 × 39 mm
- GTIN: 4047625019761