GENERAL OPERATIONAL INSTRUCTIONS
Note: Fully charge the unit before use when the instrument is first received or if the instrument
has been in storage for six months or more.
Switching the Instrument On
To switch on the instrument, press the ‘On/Off’ key briefly. There will be a short beep and a
slight pause followed by the Geotech logo.
The power on self-test will then commence with a short pre-determined self-test sequence.
Assuming there are no warnings to display the instrument will continue to the ‘Main Read
Screen’.
Switching the Instrument Off
Purge with fresh air. Run the pump for approximately 30 seconds or until the readings have
returned to normal levels.
Note: Before the instrument is switched off a clean air purge should be performed. This ensures
that the instrument is free from gas and ready for the next measurement. This final purge is
especially important for the oxygen sensor as it may degrade if stored when contaminated with
gas.
To switch off the instrument, press the ‘On/Off’ key briefly.
Note: If the ‘Auto Off’ utilities setting is set to ‘Yes’, the analyser will switch off automatically
after 10 minutes if not in use.
Instrument Main Read Screen
After the analyser has been switched on and the warm-up self-tests completed the analyser will
display the ‘Main Read Screen’.
G150 Screen Shown:
Soft Keys
Peak - Enables the operator to display the peak reading.
Store - Enables the operator to store the displayed reading for viewing/download later.
Hold - Enables the operator to hold the current reading being taken.
Note: The pump is turned off when a reading is stored.
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