Honeywell Searchpoint Optima Plus - 7.4 Bump Test (Gas Challenge)

MAN0905_Issue 7_07/17 Searchpoint Optima Plus with optional HART
®
output
Operating Instructions
2108M0550
33
7. Maintenance
3. Usinga½inch/13mmA/Fopenendedspanner,removethetwoblacknutswhichretaintheow 
housing.
 KeeptheO-ringsealswhicharebelowtheretainingnuts.
4. SlidetheowhousingofftheSearchpointOptimaPlus.Thismayrequiresomeforceduetothefriction
of the O-ring.
5. Clean any dust or contaminants from the optics using mild detergent and a soft cloth or cotton bud.
Do not use solvents or abrasive cleaners.
6. EnsurethatthelargesealingO-ringinthebodyoftheowhousing,andthetwosmallO-ringswhich
go below the retaining nuts, are clean and in good condition. Replace if in doubt.
7. SlidetheowhousingovertheendoftheSearchpointOptimaPlusandpushuntiltheowhousingis
 rmlyseated.
8. Re-ttheo-ringsandretainingnuts.
9. Cycle the power to clear any faults or warnings that may have been generated by cleaning.
7.4 Bump Test (Gas Challenge)
Searchpoint Optima Plus can be functionally checked using an appropriate test gas.
Caution: Gas readings will be generated during this procedure. Take appropriate action at the control
and monitoring system to inhibit signals.
Note:Theunitshouldbepoweredupfor1hourbeforeagastestisdone.
Note:Duringtestingthe4-20mAoutputcanbemonitoredeitheratthecontrolroomorlocallywitha
multimeter. When connecting or disconnecting a multimeter, power off the Searchpoint Optima Plus,
otherwise the unit will indicate a latched warning that the 4-20 mA loop was broken. If this occurs it can be
cleared by re-cycling the power.
1. Fit a Gassing Cover to the Searchpoint Optima Plus.
2. Applyanappropriatetestgasatarateof1–1.5litresperminutefor~30-60s.
3. Check that the Searchpoint Optima Plus responds to the test gas. The reading should be within
±20 % of the target.
Note:Ifthegasreadingisnotacceptablefortheapplication,re-zerotheSearchpointOptimaPlusand
repeatthetest.TheSHC1HandheldInterrogator,theHART
®
communication or the XNX Universal
Transmitter is required to re-zero the Searchpoint Optima Plus. Factors to consider when evaluating the gas
responseinclude:-
• Test gas and concentration
• Tolerance of the test gas concentration
• Atmospheric pressure
• Ambient temperature
• Wind speed
4. RemovetheGassingCoverandwaitforthetestgastoclear(~30s).Ensurethatthegasreadinghas
returned to zero.