Semitec 103AT-11 IP67 Temperature Sensors

Semitec 103AT-11 NTC thermistor sensing probes are TPE plastic-encapsulated temperature sensors offering waterproof protection for a wide range of temperature sensing applications. The small sensor tip is moulded in the same TPE material as the insulation on the lead-wires to help ensure IP67 integrity.

The Semitec AT-2 thermistors used in the AT-11 sensors ensure accurate temperature sensing or control to within ±0.3⁰C (at 25°C) and are better than ±0.5°C accurate over the range 0°C to 45°C.  Thus they can be replaced with no adjustment or calibration required between the control circuit and the sensor if necessary.

The AT-11  offers an excellent, highly accurate, low-cost sensor probe for general temperature sensing applications such as refrigeration control, heat pumps and underfloor heating. The 103AT-11 version specifically has become an industry standard within the digital electronic thermostat industry.

To read more about the 103AT-11 click here


  • E-vehicle Battery Management
  • E-vehicle fast-charging plugs
  • Refrigeration & HVAC Control
  • Heat Pump sensors
  • Solar & Underfloor Heating


  • Fast response to thermal change – sensing portion only 5 x 6 x 15mm
  • IP67 waterproof integrity
  • Insulation strength to 3.75kV
  • Uses our high accuracy 103AT-2 thermistor (accuracy ±0.3°C at 25°C)
  • Other R25/B values available using AT-2 and AP-2 series NTCs

Standard stock versions are 600mm, 1500mm and 3000mm long


New- The 103AT-11 is now available fitted with a USB connector.

Please contact us for more details

Waterproof NTC temperature sensing probe. IP67 rated. Uses industry standard semitec AT-2 NTC thermistor for accurate, reliable temperature sensing across a wide range of applications.