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2.7 Alarms
Whilst in the main gas screen the analyser monitors the gases levels and will alarm if any of the pre-set
levels are triggered. The alarm consists of an alarm light on the top of the instrument, an audible beep
and an indication on the LCD display. The alarm can be set as either latching or non latching. In the
latching mode the alarm continues even if the gas concentration falls below the alarm level. A latching
alarm must be manually reset. In the non-latching mode the alarm ceases when the gas concentration
falls below the alarm level.
If an alarm has been set as latching, it can be cleared by pressing the 'f' key. This displays a screen that
indicates which channel the alarm was triggered by, and allows the user to reset the alarm by entering a
confirmation code '0102'.
2.8 Peak readings
The Diveair can be used to record peak readings. Typically this would be the start and end of a gas
cylinder fill. This allows the operator to monitor the gases used to fill a particular gas cylinder. To start the
peak reading feature press key '6-Start' from the main gas reading screen. The monitor then starts
recording the peak readings.
Pressing key 6 again (now labelled as '6-stop'), stops the peak feature and displays a summary of the
peak readings obtained during that interval.
Exit from the peak review screen using the '0' key.
2.9 Batteries
The Diveair analyser is powered by internal NiMH batteries. An approximate indication of the current
charge state can be seen by pressing key '9-Batt' from the main gas reading screen (press any key to
exit). It is recommend that you wait at least five minutes (after powering on) before checking this graph to
give the battery output time to stabilise after powering up.
If the analyser is used infrequently the battery capacity may be reduced. To restore the battery to full
capacity, the unit should be totally discharged and then charged fully.
The batteries must be charged only with the battery charger supplied with the unit.
If the unit is to be stored for a long period it should be charged beforehand and at intervals of two months.
2.10 External power
The Diveair analyser can be powered from an external mains power supply by means of an optional
power supply.
The batteries will not be recharged when powered externally.
2.11 Pump
The Diveair analyser is fitted with an internal pump. This can be turned on and off from the main gas
screen by pressing the '5-pump' key.
The status of the pump is indicated on the main gas screen by highlighting the pump indicator when it is
running. If activated the pump will continue to run in all screens except for the main title screen.
The pump can be used to draw sample air into the analyser or to purge the analyser with fresh air after
use. It is possible for the pump to flow fail and switch off automatically to protect the instrument in certain
conditions. This usually indicates a restriction in the inlet, for example kinks in the tubing.
If the inlet pipe is connected to a source of gas under pressure the pump should be turned off. The
pressure of the gas will force it through the analyser. In this circumstance it is important that the pressure
be regulated down to 5 psi and to give a flow no higher than 400 mL/min.
Page 5
Geotechnical Instruments
CODAOM002 Iss.06
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