Siemens QAE2154.010/MO Immersion Temperature Sensor – Modbus RTU, 100 mm Probe, −10 to +120°C

General
The Siemens QAE2154.010/MO is an immersion temperature sensor designed to measure the temperature of liquids in pipes and tanks 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 converts the temperature-dependent resistance of its sensing element into a Modbus RTU signal via RS-485. It features a 100 mm immersion probe and is supplied with a clamp for installation in a compatible protection pocket. The protection pocket must be ordered separately.

Features
- Immersion temperature measurement for liquids in pipes and tanks.
- Modbus RTU communication via RS-485.
- 100 mm immersion probe.
- AC or DC power supply.
- Supplied with clamp for protection pocket.
- On-event addressing via push button when used with Siemens Climatix controllers.
- DIP-switch configuration for use with other controllers.
- Suitable for HVAC flow, return and domestic hot water temperature monitoring.

Key Specifications
- Brand: Siemens
- Model: QAE2154.010/MO
- Manufacturer Part Number: S55720-S465
- Product Series: Symaro
- Product Type: Immersion temperature sensor
- Measuring Range: −10 to +120°C
- Measuring Accuracy: ±1 K (0 to 70°C); ±1.4 K (−10 to +120°C)
- Sensing Element: Pt1000, Class B (DIN EN 60751)
- Immersion Length: 100 mm
- Output Signal: Modbus RTU (RS-485)
- Operating Voltage: 24 V AC ±20% or 13.5–35 V DC
- Power Consumption: Maximum 1.5 VA
- Communication Baud Rates: 9,600 / 19,200 / 38,400 / 57,600 / 76,800 / 115,200 bps
- Transmission Format: 1-8-E-1, 1-8-O-1, 1-8-N-1, 1-8-N-2
- Bus Termination: 120 Ω, jumper selectable
- Time Constant: 30 seconds with protection pocket; 8 seconds without protection pocket (at 2 m/s)
- Protection Rating: IP54
- Protection Class: Class III
- Cable Entry: M16 × 1.5
- Electrical Terminals: 1 × 2.5 mm² or 2 × 1.5 mm²
- Immersion Rod Material: Stainless steel 1.4571
- Housing Material: Polycarbonate
- Weight (including packaging): Approximately 184.4 g