4. OPERATION
The menu displays the state of the fault and alarm relays and the overrange.
(7) Select Reset Alarms from the list.
(8) Press ok.
The display returns to the Display Menu.
Note: Alarms are not reset until the esc button is pressed to leave the Display Menu and return to
the Main Menu.
4.7 SYSTEM CALIBRATION
Caution: Thecalibrationprocedureshouldonlybeperformedbyqualiedpersonnel.
ThissectiondescribeshowtocalibratethegascartridgettedtoanApexCertiedSensor.
The Transmitter Unit and other system components do not require calibration. This procedure is
sometimes referred to as system or sensor calibration.
Cartridge are supplied from the factory fully calibrated for the target gas, re-calibration at
commissioning/start-up should not normally be required, However, if operating this product
inaccordancewithEN60079-29-2,oriflocal/nationalregulationsrequirethecartridgetobe
calibrated this procedure should be followed. This procedure is also applicable if a cartridge requires
re-calibration following a warning or fault message, or as part of routine maintenance
The calibration adjustments are carried out at the Transmitter Unit and gassing is performed at the
CertiedSensor(thismaybelocallyorremotelylocated).
Thefollowingequipmentisrequired:
• Flow Housing accessory (Part No: 2110B2140) -ttedwith
rubbersealandsuppliedwithloosehydrophobiclter
• Test gas
• Regulator
Note: Zero gas and Span gas should be at roughly the same humidity levels to avoid erroneous cell
responses.
AhydrophobiclterissuppliedloosewiththeFlowHousingwhichmust bettedwhencalibrating
sensors with ammable gas cartridges.
Whencalibratingsensorsttedwithother cartridge types thentheltermountedinthesensorcap
fornormalgassensingoperation(ifonewasused)shouldbettedtotheFlowHousing.
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