Overview
The Belimo 01ST-5Q3 is a passive surface contact temperature sensor engineered for pipe temperature measurement in building controls and HVAC applications. It employs an NTC20k thermistor element to deliver precise temperature readings.
Features
- NTC20k passive sensing element for system compatibility
- Brass contact probe for effective thermal transfer
- Strap-on surface mounting eliminates pipe penetration and thermowell costs
- Plenum-rated cable for safe installation in environmental air spaces
Specifications
- Sensing Element: NTC20k thermistor
- Cable Length: 6.5 ft [2 m], 2-wire
- Probe Diameter: 0.24″ [6 mm]
- Measuring Range: -40°F to 300°F [-40°C to 150°C]
- Cable Type: Shielded plenum cable, 22 AWG
Applications
- Pipe surface temperature monitoring in closed-loop hydronic systems
- Commercial hydronic HVAC system automation
- Non-intrusive temperature sensing in facility management



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