COMPONENT
IR100 & IR120
Infra-red Remote Temperature Sensors
Overview
The IR100 & IR120 sensors oer a non-contact means
of measuring the surface temperature of an object by
sensing the infra-red radiation given o. They can be
used in the measurement of leaf, canopy and average
surface temperature.
Simple to install, the IR100 & IR120 do not inuence
the target temperature and are an eective means of
getting a spatial average temperature. The sensors
work with Campbell Scientic’s CR800, CR1000 or
CR3000 or any logger able to oer reverse excitation.
A built in amplier oers good noise immunity. The
IR100 has an ultra-narrow eld of view (4-5° halfangle) with a reduced output signal (5 mV per °C).
The IR120 has a wider eld of view (20° half-angle)
with a larger output signal (20 mV per °C).
Both variants of these sensors limit sensitivity to the
long wave, infra-red spectrum as required for infrared thermometry. The IR120 has an additional lter
to block radiation below 7 µm so is better suited to
applications where solar radiation may be reected
into the sensor.
The sensors contain a thermopile detector which
detects the presence of thermal radiation. The
thermopile detector consists of a number of
thermocouples connected in series, one set being
exposed to the source of radiation, whilst the
other is shielded from it. A highly polished metal
cone concentrates the radiation onto the exposed
junctions, which are coated with lamp-black to
enhance the eciency with which the radiation is
absorbed. The thermopile detector outputs a voltage
proportional to the thermal energy balance between
itself and the surface it is detecting.
A separate calibrated thermistor, embedded in
the sensor body directly behind the thermopile
measures the reference body temperature. Both
results are combined and processed in the logger to
output the measured surface temperature.
For outside use, the sensors can be mounted within
a simple solar shield to reduce errors caused by rapid
temperature changes.
The manual contains full details of the post
processing analysis including worked examples of
emmissivity compensation.
www.campbellsci.eu/ir100_ir120
More info: +44(0) 1509 828 888
Contactless
temperature sensor
Eective means of getting a spatial
average temperature
Benets and Features
Contactless sensor
Excellent spatial averaging
Narrow eld of view (4 or 20° half-angle)
Good noise immunity
Typical Applications
Ideal for measuring spatial average temperature (e.g.: leaf/
canopy temperature)
Ideal for non contact temperature measurement (e.g.: road
surfaces)
Campbell Park, Shepshed, LE12 9GX UK | +(0)1509 828888 | sales@campbellsci.co.uk | wwwcampbellsci.eu
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Campbell Scientic
August 7, 2013
Specications
Field of View (half angle): IR100: 4-5°
IR120: 20°
Dimensions: 92 mm long by 28 mm diameter
Fitted with two 6 mm threaded
mounting holes.
Response Time: <1 second to changes in target
temperature
Target Output Signal: IR100: 5 mV per °C
IR120: 20 mV per °C
(dierence from sensor body)
Signal Oset: Removed by calibration (supplied)
Typical Noise Level as measured by a CS datalogger:
IR100: 0.2°C RMS
IR120: 0.05°C RMS
Wavelength Range: IR100: eective bandwidth
(see the graphs below) 7-14 µm (some sensitivity from 2-6 µm)
IR120: 8 to 14 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
Options: IR-SS Solar radiation shield
IR-SS Solar radiation shield (with optional pole band
clamp)
009905 IR1x0 Mounting Arm (0.9 m long)
Sensor mounted in the IR-SS Solar Sensor
Shield tted to an 009905 mounting arm
The IR-SS is designed to protect the sensor from rapid changes of temperature
caused by direct exposure to the sun which can lead to transient errors in
temperature measurement. It can reduce direct heating of the sensor by the sun by
as much as 10°C. It also gives some protection from exposure to rain and snow. The
IR-SS is made from high grade UV stable plastic and has plastic mounting ttings
internally to prevent heat conduction with the outside of the tube. It has a 6 mm
threaded stainless steel mounting hole.
A mounting arm (009905) is available to hold the sensor out from the side of a
Campbell Scientic instrument tripod or tower. The sensor can be mounted directly
on this arm or for best accuracy when it is tted inside an IR-SS Solar Shield.
An IR-SS tted to a pole with an optional band
clamp tting
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