Teledyne GASURVEYOR 7B-500R, User Handbook Manual

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GASURVEYOR 7B-500R - USER HANDBOOK
Oxygen, 0 - 25%
(CGI and CSM Modes)
This range displays the % Oxygen (O
2
) content of the sample.
When selected, O2 is displayed in the top right corner of the
LCD. The digital display resolves to 0.1% O
2
from 0 to 21%,
and 1% O
2
from 21% to 25%. The analogue bar graph follows
in 4% steps. Fig. 2-6 illustrates the Oxygen display.
Fig. 2-6 Oxygen Range
Alarms
Alarms can have both audible and visual indications active.
The audible alarm is rated up to 85 dB(a) at 1ft. (0.3m). The
visual alarm is a red LED indicator which protrudes from the
instrument top plate, allowing viewing from any angle above
the top plate.
The alarms table, illustrated in Fig. 2-7, shows the instrument
modes and the gas ranges, alarm levels and alarm indicators
for each mode.
Mode Range Hi Lo Audible Visual L / NL
3
CGI
CO 20ppm -
 
2
NL
O
2
23.5% 19.5%
PPM -
‘Geiger’
- -

1

CSM
LEL 20% -
 
NL
CO 20ppm -
O
2
23.5% 19.5%