Honeywell XNX - Page 101

XNX Universal Transmitter
Section 3 - Calibration
99
3.3 Functional Gas Testing (Bump Testing)
Figure 216. Bump Test Menu
Warning: Exposuretodesensitizingorcontaminatingsubstancesor
concentrationscausingoperationofanyalarmmayaffectsensorsensitivity.
Followingsuchevents,itisrecommendedtoverifysensorperformanceby
performingafunctionalgastest(bumptest).
Itisrecommendedthatthesensorbetestedfrequentlytoensure
thatthesystemisoperatingproperly�Differentsensortypesmay
requiremorefrequentmaintenance,dependingonthe
environmentalconditionsandthegasespresent�The
weatherproofcoverhasaspigotforattachingtubingfromagas
cylinder�Thismaybeusedforasimplefunctional(bump)testof
thesensor�However,environmentalconditionsmaymakethis
unsuitableforsomegastypesorapplications�Itisthe
responsibilityoftheusertoensuresuitabilityofthismethodfor
eachapplication�
1�Whenbumpgasisappliedtothesensor,thebumptest
screendisplaysthecurrentreadingofthesensorandthe
peakreadingthatoccurredduringthebumptest�
Peak Reading
Full Scale
Alarm Levels
Current Sensor
Reading
Figure 217. Bump Test Screen
2� Ifthedifferencebetweenthereadingandtheapplied
gasconcentrationisoutsidetheacceptablelimitsforthe
application,followtheproceduresforzeroingandcalibrating
thesensor(seeSection3�2�1)�
3� Ifthereadingisstillinaccurate,replacethesensor(see
Section4�1)�
Oncethebumptestiscompletedsuccessfully,thetransmitter
willexitthecalibrationprocedure�BeforereturningtotheGas
Calibrationmenu,theuserwillbepromptedtoexitandturn
alarmandfaultinhibitoff,exitandleavethetransmitterininhibit
mode,ornotexit�
Caution: ExitingbeforethegaslevelhasfallenbelowthelevelofAlarm1will
causethetransmittertogointoalarm.
    
Figure 218. Exiting the calibration procedure