Schneider Electric STP120-7
- Type: NTC 1.8 kΩ (25 °C), immersion
- Measurement range: -50 → +200 °C
- Accuracy: ±0.4 °C (0 → +100 °C)
- Probe length + IP: 120 mm; sensor head IP54
Applications
STP120-7 is the primary immersion sensor for Schneider control schemes on medium-to-large pipework (DN 25–100). The 120 mm probe brings the sensor tip to the flow centre even on larger pipes. Used on: heating flow-line temperature (downstream of the control valve), DHW supply temperature after the heat exchanger, DH return-line on the primary side, boiler-room outlet/inlet measurement. The +200 °C rating extends to hotter zones of high-temperature water systems. Delivery across the EU.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 5123158010 |
| Model | Schneider STP120-7 |
| Sensor type | NTC thermistor, 1.8 kΩ (25 °C) |
| Mounting | Immersion in a pocket (G ½" or G ¾") |
| Probe length | 120 mm |
| Probe diameter | Ø 6 mm |
| Measurement range | -50 → +200 °C |
| Accuracy | ±0.4 °C (0 → +100 °C), ±0.8 °C over the remainder |
| Time constant | ≈ 25 s (in pocket) / ≈ 8 s (direct in liquid) |
| Probe material | Stainless steel AISI 316 |
| Wiring | 2-wire, terminals in the sensor head |
| Protection class | IP54 (head) |
| Compatibility | Schneider Rubisafe, Rubinet, TAC Xenta and other NTC 1.8 kΩ controllers |
Designer note
The 120 mm probe suits DN 25–100 pipes with an appropriate pocket. Pocket active length should be 100–110 mm so the probe tip sits at the flow centre. Fill the pocket with silicone oil or heat-transfer paste to cut response time by 20–30 %. If clearance is not available, use a side-mounted T-piece.
When to choose STP120-7
- Accurate water-temperature reading on Schneider Rubisafe/Rubinet systems
- DN 25 → DN 100 pipework with an installed pocket
- Higher-temperature zones (up to +200 °C)
- DH return-line temperature measurement
- Compatibility: Schneider Rubisafe, Rubinet, TAC Xenta 100/300. Not compatible with Ouman (NTC 10 kΩ) or Danfoss ECL (PT1000).
B2B delivery and logistics
- Delivery across the EU (from warehouse in Vilnius, LT)
- Competitive B2B pricing for projects and bulk orders
- 30-day payment terms for companies (per contract)
- Free technical consultation on pocket selection
Manufacturer: se.com (formerly TAC AB)
FAQ
Is the pocket ordered separately?
Usually yes. Match the pocket to pipe thread (G ½" or G ¾") and system pressure class (PN 6 / PN 16 / PN 25). Contact us and we will help specify it.
Can it be used in steam systems?
The +200 °C rating covers high-temperature water and condensate lines. For saturated steam (t > 200 °C, p > 15 bar) use PT100 or PT1000 sensors.
Resistance at 100 °C?
An NTC 1.8 kΩ element reads ~0.15 kΩ at 100 °C. Important range for typical heating flow temperatures (70–90 °C).
How to extend the cable?
Standard 2-wire line, up to 100 m of unshielded 2×1.5 mm² cable. Shielded twisted pair recommended for longer runs or high-EMI locations.
