Humidity Probe Reading (Optional); Oxygen Reading (Optional) - LANDTEC Geotech G100 Series Operating Manual

G100 Range
3.1.3

Humidity Probe Reading (Optional)

The instrument has the optional facility to use a humidity probe (specified at the time of
manufacture). This allows the instrument to read and display humidity readings from an
optional probe.
When a humidity probe is fitted, the display will change automatically to show the
current reading and a humidity probe icon will be displayed. The 'Scroll' keys on the
instrument panel are used to switch between the reading screens.
The humidity kit comprises of:
 Humidity lead
 Humidity sensor
Connection of the Humidity Sensor:
Plug the humidity sensor onto the mating connector of the transmitter or connection
cable. Make sure that the catches are aligned correctly. Tighten the knurled nut by
hand.

Note: The humidity sensor can take 30 minutes to stabilise and special handling is
required for optimum performance and stability. Please refer to the instruction
leaflet included with the humidity sensor packaging for the Humidity Standards.
3.1.4

Oxygen Reading (Optional)

The instrument has the optional facility to use an internal oxygen cell (specified at the
time of manufacture). This allows the instrument to read and display oxygen readings
along with CO .
2

Note: Oxygen sensor stability; as the sensor is a partial pressure sensor its output
will be affected by changes in relative humidity. Although the percentage of O
in the air is relatively constant, the relative humidity in air is variable. A unit
calibrated with dry air could cause the readout to read low by up to 0.5% by
volume.
 Copyright Geotechnical Instruments (UK) Limited
OMG100N1.21
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