NTC 10K B3950 Water Temperature Sensor – Precision monitoring for your heating system
If your boiler is cycling unnecessarily, your thermostat isn’t responding, or your water is overheating, a faulty or inaccurate sensor is often the culprit. This NTC 10K B3950 probe with ±1% tolerance provides the stable, reliable readings you need to keep your heating system running efficiently, season after season.
Note: The 1-metre cable can be trimmed to your required length without affecting the sensor’s accuracy or performance.
Why choose this model? (Key benefits):
- ±1% Precision — A tight tolerance that ensures your thermostat reacts exactly when it should, eliminating delays and temperature drift.
- -20°C to +105°C Range — Versatile enough for central heating systems, hot water boilers, solar thermal panels, and cooling systems.
- Superior Electrical Insulation — Features insulation resistance over 100 MΩ and has passed a 1800V AC, 1mA, 2-second test, ensuring durability even in high-humidity environments.
- Compact 5 x 30 mm Probe — Designed to fit into tight pipe housings or standard boiler sensor ports without the need for modifications.
- Adjustable 1-Metre Cable — Easily trim the cable to the perfect length for your setup; installation takes less than 10 minutes.
Technical Details and Performance
This probe uses an NTC 10K thermistor with a B3950 thermal constant, ensuring precise and predictable resistance changes relative to temperature. The 5 mW/°C dissipation constant minimises sensor self-heating, guaranteeing accurate readings even under continuous operation. The compact 5 x 30 mm sensor head allows for easy mounting in restricted spaces, such as pipework or dedicated boiler sensor wells. The 1-metre cable provides ample flexibility for positioning and can be shortened to suit your specific installation requirements.
| Parameter | Specification |
|---|---|
| Sensor Type | NTC 10K ± 1% (B3950) |
| Measurement Range | -20°C to +105°C |
| Cable Length | 1 metre (trim-to-fit) |
| Probe Dimensions | 5 x 30 mm |
| Dissipation Constant | 5 mW/°C |
| Electrical Insulation | >100 MΩ insulation resistance |
| Voltage Test | AC 1800V, 1mA, 2 seconds |
Package Contents
- 1 x NTC 10K B3950 Water Temperature Sensor Probe with 1m cable
Frequently Asked Questions
Is this probe compatible with my thermostat?
The NTC 10K B3950 probe is compatible with the vast majority of thermostats and temperature controllers that support NTC 10K sensors. Please check your equipment’s manual to confirm the supported sensor type.
Can I use this probe directly in water?
The probe is designed for water temperature measurement and features superior electrical insulation (>100 MΩ). It is recommended to mount the probe in a dedicated sensor well or sleeve for direct contact with the water, as per your specific system’s instructions.
What happens if I cut the 1-metre cable?
Shortening the cable will not affect the sensor’s accuracy or functionality. Simply ensure you reconnect the wires correctly and insulate the ends properly to prevent short circuits.
Can this be used for boilers or solar thermal panels?
Yes, the -20°C to +105°C temperature range makes it perfectly suited for boilers, solar thermal panels, central heating systems, and any other heating equipment operating within these parameters.
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