ANALOX 1371 MK 2 SURVEYOR CARBON DIOXIDE MONITOR
1371-810-03 User Manual, August 2007
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5.2.4 It is important to realise that the Analyser in this Instrument responds to the partial pressure of
Carbon Dioxide in the gas sample and that the calibration is strictly valid only at the temperature
and pressure at which the calibration was done. Small changes in readings will occur as ambient
pressure changes from day to day. However, these changes are limited to about 0.15% of reading
per millibar pressure change and for most applications, would be insignificant.
For example, assume an Instrument is monitoring a 1% gas mixture at 1000mB pressure and is
subjected to a 30 mB pressure increase over a period. This would result in a change in reading of
4.5% of the 1% reading and the Instrument indicating 1.045% .
5.2.5 If during the Calibration process, the desired readings cannot be achieved, then it is possible that
the Infra-Red Transducer module requires service. To check that the Transducer module is
operating correctly, proceed as follows.
5.2.6 THIS OPERATION SHOULD ONLY BE CARRIED OUT BY A COMPETENT TECHNICIAN,
SINCE THERE ARE LETHAL VOLTAGES PRESENT INSIDE THE UNIT.
Open the front clear plastic cover of the Instrument. Remove the Four Corner screws in the front
panel and carefully ease the front panel out of the Instrument case. The Infra-Red Transducer
module is located in the lower right corner of the Instrument housing. On the top cover of the
Transducer module, there is a status indicator light.
Under normal operating conditions, this light should be flashing On and Off at about a 1 second
period. If the Transducer module requires service, then this light will either be Permanently ON or
OFF. If this is the case, then contact either your distributor or Scottish Anglo E.P Ltd. for further
Advice.
