4 PRINCIPLE OF OPERATIONS
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The range selection only refers to the current output, as the digital display
covers the full range capability of the monitor.
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If the concentration exceeds the selected range or instrument range, the
digital display flashes - (reading) - “out” - (reading) - “out”. In every
other way, the monitor functions normally.
9
In “AUTO,” as the
concentration increases
, switching to the next range
takes place at 100% of the current output, giving a 50% output on the
upper range (10% in linear output). When the
concentration decreases
,
switching takes place at 0% of the current output, giving a 50% output on
the lower range (10% in linear output). This difference gives a range
switching hysteresis of
one decade
.
At all times, the operator can either monitor or remotely record the current output
range, using the two, active, remote “RANGE INDICATION RELAY” contacts.
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