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

RHT3 Temperature & Humidity

Provides reliable and stable humidity and temperature measurement with the new generation 180R sensor.

Especially designed for use in meteorological applications and for a wide range of instrumentation, for example, recorders, data loggers, and laboratory equipment and monitoring.

  • RHT3 sensor – superior long-term stability
  • Optional warmed humidity probe and chemical purge
  • USB-connection cable for service use
  • Fits in DTR13 and DTR502/503 radiation shields and also in the Stevenson screen
  • Weather-proof housing IP65
  • Optional fast temperature probe
  • Different output possibilities: voltage, RS-485, resistive Pt100
  • Applications: meteorology, aviation and road weather, instrumentation
Relative humidity measurement
Measurement range 0 to 100% RH
Accuracy (incl. non-linearity, hysteresis and repeatability) at:
+15 to +25°C ±1% RH (0 to 90% RH)
+59 to +77°F ±1.7% RH (90 to 100% RH)
For other temperatures, please see the the brochure
Recommended humidity sensor Vaisala HUMICAP® 180R
Temperature measurement
Measurement range -80 to +60°C (-112 to +140°F)
Accuracy at +20 °C
Voltage ±0.17°C
RS485 ±0.12°C
Passive resistive output according to IEC751 1/3 Class B
Temperature sensor Pt100 RTD
Other variables dewpoint/frost point temperature,
wet bulb temperature, mixing ratio.
Operating environment
Operation -80 to +60°C (-112 to +140°F)
Storage -80 to +60°C (-112 to +140°F)
Inputs and outputs
Operating voltage 7 to 28 VDC
Voltage output 0 to 1V, 0 to 5V, 0 to 10V
Resistive Pt100 (4-wire connection)
Connection cables 3.5, 10, and 30m
Material (housing) PC
Housing classification IP65

New probe for reliability.
The new RHT3 provides reliable humidity and temperature measurement.

Long-term stability.
The RHT3 has a new generation 180R sensor that has excellent stability and withstands well harsh environments. The probe structure is solid and the sensor is protected with a sintered teflon filter, which gives maximum protection against liquid water, dust, and dirt.

Warmed probe and high humidity environment.
Measuring humidity reliably is challenging in environments where humidity is near saturation. Measurements may be corrupted by fog, mist, rain, and heavy dew. A wet probe may not give an accurate measurement in the ambient air.  As the sensor head is warmed continuously, the humidity level inside it stays below the ambient level. Thus, it also reduces the risk of condensation forming on the probe.

Fast temperature measurement.
What’s more, with its fast response time, the additional temperature probe for the RHT3 is ideal for measurement in environments with changing temperatures.

Long lifetime.
Protecting the sensor from scattered and direct solar radiation, and precipitation will increase its lifetime. Thus, ICT recommends installing the RHT3 in one of the following radiation shields: DTR503, DTR13, or a Stevenson screen.

Easy maintenance.
The probe can be calibrated using a pc with a USB cable, with the push buttons, or with the MI70 indicator.