GMI PPM Gasurveyor 500, User Handbook Manual

Page: 17 / 90

7
Search Mode
Search mode is an enhanced variant of the ppm flammable
range with increased resolution and faster response. Search
mode can be used for detecting leaks which can then be
classified using the more accurate ppm, LEL and Volume
Gas ranges.
The Search range provides an indication of gas only, and
it should not be used to carry out any assessment of gas
levels.
The pump speed in this range is higher, which is apparent
from the increased sound from the pump.
The Search range, by default, has the audible and visual
Geiger indication configured which provides indication
of gas concentration increase via the increased rate of
sounder and LED pulse.
When the instrument is switched on, the visual Geiger
indication is enabled and the audible Geiger indication is
disabled. To enable audible Geiger indication, press and
hold Button Two .
The display changes between search symbol and Aud (if
enabled) as shown in Figure 2.5.
Figure 2.5 Search Mode
GENERAL INFORMATION