IR100 Radiometer - Infra-red Remote Temperature Sensors
Non-Contact Temperature Measurement of Remote Surfaces
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported


The IR100 sensor provides a means of accurately measuring the temperature of a remote surface without influencing the target by sensing the infra-red radiation emitted. This makes it ideal for measuring spatial average temperatures for leaf and tree canopy studies and for hard surfaces such as roads where installing invasive sensors would be costly or difficult. The sensor can also be used to measure the temperature of soil, snow or water.

Read More


Technical Description

The IR100 sensor has a field of view with a half angle of 4.5° and an output signal of   5 mV per °C; a built in amplifier ensures excellent noise immunity. An integrated calibrated thermistor behind the main thermopile provides a reference body temperature. For long term external use the sensor can be mounted into a specially adapted camera housing or within an adapted data logger enclosure with IR transmissive window or an enclosure with a hard germanium window. The sensor is compatible with the CR1000, CR800 series and CR3000 data loggers or any other logger offering suitable reverse excitation.


Field of View (FOV) 4-5° (half angle)
Dimensions 92 mm long by 28 mm diameter
Response Time <1 second to changes in target temperature
Target Output Signal 5 mV per °C (difference from sensor body)
Signal Offset removed by calibration (supplied)
Typical noise level IR100 0.2°C RMS as measured by a CS datalogger
Wavelength Range effective bandwidth 7-14 μm (some sensitivity from 2-6 μm)
Calibrated Range -25°C below body temperature to +25°C above body temperature
Operating Range -25°C to +60°C
Accuracy over Calibrated Range ±0.2°C (against a blackbody source over a 50°C temperature span under laboratory conditions)
Current Consumption 0.4 mA (when excitation applied) 0 mA quiescent
Sensor output impedance 320 Ω
Thermopile Excitation Voltage +2 to +3.5V
Thermistor Excitation Voltage -2.5V or +400 mV


Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X)-Series CR300-Series CR800/CR850 CR1000 CR3000 CR6 CR7X CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000

Resources and Links