Honeywell XNX Technical Manual

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

Honeywell XNX Specifications

General

Ingress Protection	IP66/67
Product Type	Universal Transmitter
Enclosure Rating	IP66/67
Display	LCD
Communication Protocols	HART, Modbus, Foundation Fieldbus
Power Supply	24 VDC nominal, 18-32 VDC
Operating Temperature	-40°C to +65°C (-40°F to +149°F)
Material	Aluminum or Stainless Steel
Gas Types	Toxic, Oxygen, and Combustible gases
Output	4-20 mA
Relays	3 programmable relays
Approvals	ATEX, IECEx, UL, CSA
Sensor Compatibility	Electrochemical, catalytic, infrared, and other sensor types