Danfoss ESM-11 surface temperature sensor, Pt1000, 0…+100 °C, DN 15-65
- Type: Pt1000 (class B per EN 60751)
- Measuring range: 0…+100 °C
- Ingress protection: IP32
- Mounting: pipe surface DN 15-65 (clamp included)
Where ESM-11 is used
ESM-11 fits situations where you need fast, accurate pipe temperature data, but the piping has no immersion pocket and adding one would require draining the system. Typical cases: modernizing an older substation (adding an ECL controller to existing piping), monitoring small-bore secondary loops, DHW return line, or heating loop supply temperature where the 3-second time constant lets the controller respond to flow changes in real time.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 087B1165 |
| Model | ESM-11 |
| Type | Pt1000 (class B per EN 60751) |
| Application | Pipe surface temperature (heating, DHW) |
| Measuring range | 0…+100 °C |
| Accuracy (class B) | ±(0.3 + 0.005 × \|t\|) °C |
| Output signal | 1000 Ω at 0 °C (Pt1000 characteristic) |
| Time constant (τ) | 3 s |
| Connection | 2-wire cable (terminal block) |
| Ingress protection | IP32 |
| Housing material | Polycarbonate |
| Mounting | Clamp on pipe DN 15-65 (clamp included) |
| Weight | ~26 g |
When to choose ESM-11
- Modernizing an ECL Comfort system where existing piping has no immersion pockets
- Fast response (τ = 3 s) to pipe temperature changes required
- Small-bore pipe (DN 15-25) where a pocket would not fit or would restrict flow
- Compatibility: Danfoss ECL Comfort 110 / 210 / 296 / 310 (all application keys); any other controller accepting Pt1000 signal
When NOT to choose ESM-11
- High moisture / splash protection required — ESM-11 is only IP32; use the immersion ESMU-100 (IP54)
- Pipe will not be insulated (surface reading will be unreliable)
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across Lithuania (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation on sensor choice (ESM-11 vs ESMU)
Official Danfoss catalogue: store.danfoss.com/087B1165
Frequently asked questions
How does ESM-11 differ from ESMU-100?
ESM-11 is clamped onto the outside of a pipe — no draining required, but accuracy depends on insulation and contact quality. ESMU-100 is immersed into the pipe via a pocket or directly with its G½" fitting — direct contact with the water, more accurate, but requires a pocket and system drain-down.
Is thermal paste required?
Recommended, not mandatory. A silicone thermal paste improves heat transfer from pipe wall to sensor body and cuts measurement error by 1-2 °C. Combine with proper clamp tension.
How long does ESM-11 last?
In practice — 10-15 years if properly insulated and mechanically undamaged. The Pt1000 element itself has a very long service life; the main failure sources are damaged cables, moisture in the terminal enclosure, or mechanical impact on the plastic housing.
Does it fit pipes larger than DN 65?
The clamp supplied covers DN 15-65. For larger pipes, order a separate clamp or use a universal metallic mounting. Contact us — we will recommend a suitable option.
