MANUALP/4000_SERVICE_0712 July2012
22
about 16.5% CO
2
). This value may be raised or lowered to achieve the
exact CO
2
calibration result. (‘Normal’ range is from 0.550 – 0.750). If the
cabinet display is reading too high when the CO
2
concentration is
compared with a test instrument (‘Fyrite’ etc) then the reference voltage
should be adjusted slightly DOWN.
Just press either the ‘UP or ‘DOWN’ button VERY briefly and then WAIT
for the meter reading to change as the reading will lag the button press
by several seconds.
3 REMOVE any shorting jumpers from pins of JP4 & JP5. Recheck
calibration if necessary.
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