Table of Contents
Advertisement
2
Normal Use
2.1 Switching on
Switch on the Diveair by pressing the red [on] key.
If required the display contrast can be adjusted by means of the scroll keys (1 and 6 ) before entering
the main gas reading screen. It is possible to return to this screen at any time by pressing key '0' from the
main gas screen.
Otherwise press key '0' to enter the gas read screen.
It is recommended that a zero and span is performed on first receipt of the instrument. On receipt
of the instrument, or when the instrument has not been used for some time, a zero and span
calibration should not be carried out until the VOC sensor has normalised. The instrument
should be on for a minimum of 1hour before calibration.
2.2 Switching off
Switch off the Diveair by pressing the red [on] key at any time.
Remember to always purge the instrument with clean air before switching off. This will help preserve the
life of the sensors fitted to your instrument.
2.3 Keys
The numeric keys can be used to enter data and select functions as indicated on the screen. The '0' key
acts as an exit key to step back one screen in the menu system.
When entering numeric data, holding down the '0' key will act as a backspace.
2.4 Connecting gas supply
Always ensure a particulate filter is fitted inside the inlet port on the analyser. Failure to do so
could result in dirt entering the analyser which could cause damage to the optics.
When the Gas Analyser is in use, ensure the exhaust port is clear and unblocked at all times. If
the exhaust port is blocked while the Gas Analyser pump is running or the analyser is being
checked for accuracy with a regulated gas supply, the analyser could become over-pressurised.
Such over-pressurisation could lead to damage of internal components, which in turn might result
in a build up of gas within the case of the analyser.
Connect the inlet hose to the inlet of the analyser. The inlet port is a simple barbed connector on the right-
hand side of the analyser.
2.5 Types of sample hose
The sample hose material is important. The analyser measures low concentrations of VOCs. Some types
of hose can give off VOCs and cause an offset in the VOC reading. Other types may absorb VOCs and
re-emit them later, again causing spurious readings. The hose should be made of PTFE (some trade
names are Teflon and FEP) or metal and this will not affect the VOC reading. Stiff polyurethane is a good
second choice if the former are not available. Do not use hoses made of Silicone or rubber.
2.6 Gas Read Screen
The gas read screen displays the real time concentrations of the gases. Please note that until the
instrument has completed it's minimum warm-up (45 seconds), stars "**.*" will be shown in place of the
gas values. Chevrons ">>.>" may also be displayed in place of gas value during over-range or under-
range conditions.
Page 4
Geotechnical Instruments
CODAOM002 Iss.06
Advertisement
Table of Contents
