
49391
Revision 3
33
Gasurveyor 700
USER MANUAL
1
CAUTION: Always zero the monitor in fresh air.
4.4.5 Logging
By default, automatic datalogging is active and being performed every 4 seconds.
4.5. Pipeline Gas Test (PGT)
Pipeline Gas Test is used to discriminate between methane and other hydrocarbons. It can quickly
determine if the source of gas leaks is from pipeline gas or is naturally occurring biogas.
PGT can be configured to be available in all modes of operation, except for CSM.
Note: PGT mode requires an additional 5-minute warm-up after powering up the
monitor. During that time the PGT will flash and the feature won’t be accessible.
Note: This chapter describes the Pipeline Gas Test fuctionality for instrument firmware
v1.30 (or later). Please see
Appenix A: Pipeline Gas Test (pre firmware v1.30)
details on how to use PGT on older GS700 units.
To access the PGT and perform the test:
1. From the normal operating display, press the
PGT
button. This opens the PGT menu as shown
in
Figure 42: PGT Menu
.
Figure 42: Access Menu
2. Press
Zero
button to zero the flammable ranges and begin sampling. This will initiate a 5-minute
countdown (as shown in
Figure 43: PGT Sampling
) during which time the gas leak survey
should take place.
Figure 43: PGT Sampling