Description
Siemens 544-577-40 Immersion Temperature Sensor Overview
The Siemens Building Technology 544-577-40 is a precision immersion temperature sensor designed for reliable fluid and pipe temperature measurement in commercial HVAC and building automation applications. Utilizing a Platinum RTD (Resistance Temperature Detector) element with a 1k Ohm resistance output, this sensor delivers accurate, repeatable readings across a broad operating range. It is engineered for seamless integration into building automation systems requiring dependable hydronic or process temperature monitoring.
Key Features
- Sensor Type: Platinum RTD (Pt RTD) — 1k Ohm resistance output
- Output Signal: 375a
- Temperature Range: 0°F to 250°F (-18°C to 121°C)
- Probe Length: 4 inches
- Thermowell: Included for easy installation and sensor protection
- Connection Type: Leads for straightforward field wiring
- Brand: Siemens Building Technology
- SKU: 544-577-40
Application & Benefits
The 544-577-40 is ideal for immersion-style temperature sensing in hydronic heating and cooling systems, boiler loops, chilled water lines, and other fluid-based HVAC applications. The included thermowell allows the sensor to be installed and removed without draining the system, reducing maintenance downtime. Lead-type connections simplify field wiring to building automation controllers and DDC systems. The Pt RTD technology ensures long-term stability and accuracy, making this sensor a trusted choice for commercial building automation environments.
Specifications
- Manufacturer: Siemens Building Technology
- Part Number: 544-577-40
- Sensor Element: Platinum RTD (Pt RTD)
- Resistance: 1k Ohm
- Output Signal: 375a
- Operating Temperature Range: 0°F – 250°F (-18°C – 121°C)
- Probe Length: 4 inches
- Thermowell: Included
- Connection Type: Leads







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