Schneider 5123102010 STP100-50 Water Temp Sensor NTC 1.8K 50mm
The Schneider Electric 5123102010 (Model: STP100-50) is a passive, immersion-type water temperature sensor engineered for hydronic applications in commercial HVAC networks. This sensor incorporates a high-accuracy 1.8KΩ @ 25°C NTC thermistor housed in a 50mm (1.97 in.) stainless-steel probe. Designed to measure fluid temperatures inside chilled water, heating water, or condenser lines, it is typically paired with a brass or stainless-steel thermowell (sold separately) to allow safe probe installation and replacement without draining the piping system.
| Protocol / Communication | None. Passive resistive output. |
|---|---|
| I/O Points & Signals | 1 passive resistive output channel. 2-wire non-polarized screw terminals. |
| Power Supply / Voltage | Passive (no external power required) |
| Sensor Parameters & Accuracy |
|
| Regulatory & Certifications | CE, RoHS Compliant, WEEE, REACH-compliant |
| Enclosure & Material | IP65-rated aluminum/polymer mixed junction box with a watertight cable gland |
- Fan Coil Unit Water Temperature Sensing: Short probe is highly optimized for narrow water lines (DN50 to DN80) supplying secondary air-handling cassettes or fan coils
- Zone Hydronic Loop Monitoring: Installed on regional branch piping to verify hot/chilled water supply temperatures
- Coil Pre-Heat Water Temperature: Monitors water temperature close to heating coils to protect systems from cold drafts during winter
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