Heath Consultants GT Series - Manual (Page 21)

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GENERAL FEATURES
Purge
This mode is used in gas and air purging applications.
Refer to Chapter 8 for ‘Purge’ mode operation.
Sniffer
This mode is used to find small fitting leaks. Very fast
detection rates are achieved using the semiconductor
sensor in the probe.
Refer to Chapter 9 for ‘Sniffer’ mode operation.
Pressure
In this mode, the instrument can be used as a manometer
to measure appliance and regulator pressure and to check
the system for leaks.
Refer to Chapter 10 for ‘Pressure’ mode operation.