
30 CONTENTS
1.2.7 Temperature Probe
Campbell Scientific T107
User Information
A low pressure gas cell filled with HCL is used to provide narrow absorption
lines at a number of different frequencies across the bandwidth of the FTIR
instrument. The gas cell acts as an internal calibration reference and is placed
directly into the solar beam. Campbell Scientific‘s Temperature Probe T107
is used for monitoring the temperature inside the FTIR spectrometer next to
the gas cell because absorption lines depend on temperature. Two redundant
sensors are used for monitor the temperature of the gas cell.
Figure 1.20: Campbell Scientific Temperature Probe T107
AC power lines can be the source of electrical noise. Because the CR1000
is in an electronically noisy environment, the T107 is measured with 50 Hz
rejection.
Maintenance
The T107 is a very user-friendly sensor which requires minimal maintenance.
For most applications it is unnecessary to recalibrate the thermistor offset.
However, you can determine the offset by placing the sensor in the calibration
chamber at a certain value of e.g. 0 °C. The offset has to be placed in the
Const.CR1 file on the CF Card of the CR1000. For details see section 1.3.3
on page 39.
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