Ouman TMW-100/NTC10
- Type: NTC 10 kΩ (25 °C), immersion
- Measurement range: 0 → +130 °C
- Accuracy: ±0.5 °C
- Probe length + IP: 100 mm; sensor head IP54
Applications
Ouman TMW-100/NTC10 solves accurate measurement on larger pipework: DN 40, DN 50, DN 65 and above, where a 50 mm probe cannot reach the flow centre. Used on: primary DH return-line measurement, gas boiler feeder line (DN 50+), primary measurement in higher-capacity substations, hotel and school heating loops. The 100 mm probe reads true stream temperature in DN 40–100 pipework when installed with a matching pocket. Delivery across the EU.
Technical specifications
| Parameter | Value |
|---|---|
| Code | OMA0013 |
| Model | Ouman TMW-100/NTC10 |
| Sensor type | NTC thermistor, 10 kΩ (25 °C), Beta ≈ 3977 K |
| Mounting | Immersion in a pocket (specified by pipe diameter) |
| Probe length | 100 mm |
| Probe diameter | Ø 6 mm |
| Measurement range | 0 → +130 °C |
| Accuracy | ±0.5 °C |
| Time constant | ≈ 25 s (in pocket) / ≈ 10 s (direct in liquid) |
| Probe material | Stainless steel AISI 316 |
| Wiring | 2-wire, terminals in the sensor head |
| Protection class | IP54 (head) |
| Compatibility | Ouman A203, C203, C202L, EH-105, S203 and other NTC10 controllers |
Designer note
The 100 mm probe reads the flow centre in DN 40–100 pipes, but pocket depth must match pipe thickness — typical active length is 80–90 mm. For pipe DN > 100 consider a T-piece where the sensor screws into the side (perpendicular to flow). Fill the pocket with heat-transfer paste or silicone oil to cut the time constant by ~30 %.
When to choose TMW-100/NTC10
- DN 40, DN 50, DN 65 and larger pipework
- Primary measurement point in higher-capacity substations (> 250 kW)
- Primary measurement on the DH network (return-line T)
- Main heating flow in hotels, schools or office buildings
- Compatibility: Ouman A203 / C203 / C202L / EH-105 / S203; standard NTC10 signal. Pockets — G ½" or G ¾" with 80–100 mm active length.
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 / probe-length selection
Official Ouman catalog: ouman.fi/tuote/tmw
FAQ
When to pick TMW-100 over TMW-50?
Whenever the pipe is DN 40 or larger. In such a pipe, a 50 mm probe would read temperature near the pipe wall rather than at the flow centre — usually 2–5 °C below true. The 100 mm probe reaches deeper (through the pocket).
Which pocket is required?
A standard G ½" or G ¾" pocket with 80–100 mm active length. Contact us — we will match the pocket to your pipe diameter, thread and pressure class (PN 6, PN 16, PN 25).
How is the cable extended?
Standard 2-wire NTC line up to 100 m of 2×1.5 mm² cable. Shielded twisted pair for longer runs or parallel routing with power cables.
Can it be used in DN 25 piping?
Physically — yes if the pocket allows. But a 100 mm probe in a small-diameter pipe will hit the opposite wall or protrude into the flow — inaccurate and disruptive to flow. Use TMW-50 for DN 15–32, TMW-100 for DN 40+.
