5.7 Gas Leak Detection - Extech Instruments CO80 Manual

5.7 Gas Leak Detection

Flammable gas leak detection can only be activated if this option is
specified at the time of purchase. Press "Scroll" until display five is
activated (see page 9) . Upon entering this screen, the CO80 will
commence a thirty second purge of the flammable gas sensors.
Do not subject the CO80 to any flammable gas during the thirty second
purge period, as this will affect any future readings until the power is reset.
Once the purge period has finished, an audible alarm is activated and the
display reverts to the above right. Connect a length of the silicon tubing
provided as part of the package or the thermocouple combustion probe to
the sample port (see section 2.7). Place the end of the sample tube at the
area of inspection.
Any increase in the density of leaked flammable gas beyond 20 ppm will
increase the pitch of the crescendo alarm, as well as modifying the
display. The digits will modify to reflect the change in density as per
below:
Indication Level
Warning
The display will
change after
the 30 purge
period (left) to
ppm level
indicator once
activated (right)
0
1
2
3
38
Flammable Gas
Concentration
20 – 100 ppm
100 – 1,000 ppm
1,000 – 10,000 ppm
> 10,000 ppm
CO80 V3.1 04/06