Heath Consultants Gasurveyor 500 Series - Manual (Page 21)

11
OPERATING INSTRUCTIONS
Modes of Operation
The instrument has two modes of operation which are
accessed by switching the instrument ON with either
Button One or Button Two . See Figure 3.1
below.
GASURVEYOR 3-500
ON OFF
PUMP
ON OFF
INST.
ALARM ACK.
PURGE
Figure 3.1 Instrument Front Plate
Mode 1. Switching ON with Button One provides
two gas ranges:
a) LEL autoranging to Volume Gas.
3