Teledyne GASURVEYOR 7B-500R, User Handbook Manual

Page: 21 / 64

2-9
GENERAL INFORMATION
Filters
The minimum requirement is a cotton particulate filter and
a hydrophobic filter. These filters, incorporated in the probe
handle assembly, are available from GMI. Filters must be
checked at frequent intervals and where appropriate changed
to ensure a clean sample path. See Filter Replacement in
Chapter 5 OPERATOR MAINTENANCE.
Liquid Crystal Display (LCD)
The LCD shows the current gas readings in both analogue
and digital form together with operational and status
information. The display is protected by toughened glass.
Backlighting is provided to enable the display to be seen
under low ambient light conditions.
Before Use Checks
The following checks should be carried out before use:
• The instrument is clean and in good condition.
•
The battery pack has sufficient power left for the
intended use of the instrument.
• The filters are clean and in good condition.
• The sample line and any accessories are in good
condition and leak free.
• All gas ranges are operational and zeroed
correctly.
• Instrument calibration is valid.
• Service is not required.