4. OPERATION
CongureAlarms Conguration Menu
Caution: Alarm 2 value can be set below Alarm 1 value.
When installed to measure ammable gas it is essential that
either the Transmitter unit or control network is congured to
latch the overrange condition. If the Transmitter unit local
relays are used this should be achieved by enabling the
overrange latching function of the Transmitter unit. Depletion
of oxygen as a consequence of displacement by ammable
gas can result in the gas reading returning to zero.
Providesthemeanstocongurethepointatwhichthealarmsactivateandwhetheroverrange
latchingisrequired.Therangeofsettingsdependsonthetypeofgascartridgettedtothe
CertiedSensor.
When the Transmitter Unit’s alarm thresholds are changed, the actual cartridge parameters are
updatedtoreecttheTransmitterUnit'sconguredvalues.
The default state for Overrange latching is not latched.
When activated, overrange latching causes the Transmitter Unit to latch the A1 and A2 Alarm relays
andthe4-20mAoutputifanoverrangegasconditionisdetected.Overrangelatchingonlyeffects
alarm relay latching after an overrange condition, not at the A1 and A2 alarm thresholds. Overrange
latching only operatesin the normal Transmitter Unit active condition, not in Gas Challenge or
Gas calibrate conditions.
WARNINGS
Change cartridges using the procedure described below.
Failure to correctly follow this procedure could result in the
wrong cartridge being installed, and possibly non-detection
of events. Alternatively, extraneous alarms could be
triggered by chemicals detected but not of concern at a
particular location.
Sensor Cartridges may contain corrosive solutions.
Dispose of according to local and national regulations.
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