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Enabling better global research outcomes in soil, plant & environmental monitoring.

THERM-EP Epoxy Thermistor

For the measurement of soil, air or liquid temperature.

The epoxy temperature sensors (THERM-EP) are high quality, low cost sensors for measurement of soil, air or liquid temperature. The sensor consists of a thermistor embedded in a protective epoxy body. THERM-EP sensors can be used in a wide range of applications from concrete monitoring, explosive testing, as well as soil monitoring and climate control. THERM-EP has a measurement range between -40°C and +80°C. Standard cable lengths are 5m, 30m and 50m however custom length cables are available.

THERM-EP Epoxy Thermistor Sensor Features

  • Measurement range between -40°C and +80°C
  • Wide range of applications
  • For measurement of soil, air or liquid temperature
1. Electrical Characteristics
Item Symbol Test Condition Performance Unit
1.1 Rated Resistance R25 °C + 25±0.05°C 10±1% k Ohms
1.2 B value B25/85 + 25±0.05°C,
3976±1% k
1.3 Time constant t In well stirred water <=11 sec
1.4 Dissipation factor s In still air >=2.2 mW/°C
1.5 Voltage withstanding U AC1500V (Peak value) No destroy or spark V
1.6 Insulation resistance Ri DC500V >=100 M Ohms
1.7 Max.power Pmax Ambient Temp. +25°C <=0.1 mW
2. Reliability test 3. Operation Notice
2.1 Intensity: Fix the probe, pull the lead by the striped wire end with 10 N force for ± 1sec. No visible damage. 3.1 Application: Temperature measure and control.
2.2 High Temp. Store (in air) 80±3 °C 100 h
Delta R25/R25 <= 3%
3.2 Operating Temp. Range: -40°C~+80°C
2.3 Low Temp. Store (in air)
-40±3 °C 1000h
Delta R25/R25 3%
3.3 Avoid measurement error caused by self heating with excess current.
2.4 Heat and Humidity Stability
40±2°C 92%RH~98%RH 240h
Delta R25/R25 3%
3.4 Avoid excessive heat shock, the hot air blow should be at least 10 mm from the probe, in cases when a heat shrink protection tube needs to be attached.
2.5 Temperature Shift
-50±3 °C X 30min 105±3 °C X 30min 5 times
Delta R25/R25 <= 3%
  • The THERM-EP is ideally supported by the Thermistor Sensor Meter 2 (TSM2), a wireless, stand-alone logging instrument available from ICT International. With the TSM2, THERM-EP sensors have their excitation voltage measured at every measurement interval or in live mode for increased accuracy.
  • The TSM2 can support up to 9 THERM-EP sensors.
  • For complete monitoring solutions, the THERM-EP is used in combination with the MP406 soil volumetric moisture content sensor, tensiometers for soil water potential, ICTO2 soil oxygen sensor, or the ICT International automatic weather station.


  • Soil monitoring
  • Climate control
  • Concrete monitoring
  • Explosive testing
  • TSM2 Temperature Sensor Meter
    Temperature Sensor Meter - Configured for ICT leaf temperature sensors. 9 sensor capacity; IP65 rated enclosure; stand-alone logging capability to 2GB MicroSD Card; Windows software; breakout board; user manual.