User guide

5
IM 11M06D03-01E-A
Withthisanalyzer,thesensor(Zirconiaelement)isheatedupto750˚C,soEquation(2)isvalid.Atthatpoint,the
relationship as in Figure 2.1 is effected between the oxygen concentration of the measurement gas in contact with
the positive electrode and the electromotive force of the sensor (= cell), where a comparison gas of air is used on the
negative electrode side.
Figure 2.1
2.2 CALIBRATION GASES
2.2.1 CALIBRATION (ZERO) GAS
Thecalibrationgastypicallyusedis1%oxygenbalancedinnitrogen;however,anoxygenmixturebetween0.4%
and8%isacceptable.Acompressedgascylinderiscontainingcertiedgasmixturesttedwithadualstageregulator
shouldbeused.Themaximumworkingpressureofthecalibrationsystems(MC1&AC1)is35psig.Thereferencegas
should be clean, dry instrument air.
2.2.2 REFERENCE (SPAN) GAS
Referenceairisfromthesamesourceasthespangas.ThereferenceairowstothebacksideoftheoftheZirconia
cell,andisusedatalltimes.Thecalibrationunitsareplumbedtoprovideacontinuousowrateofthereference,as
wellas,calibrationgasowduringcalibration.Aclean,dryairsourceisrecommended,suchasinstrumentair.Install
aninlinelterbeforethecalibrationunittoremoveanymoistureordirt.Aregulatormustbeattachedtotheinstrument
airsourcetoprovidetheappropriateworkingpressureforthecalibrationunit.Themaximumpressureis35psig.
Never use pure nitrogen for calibration.
Compressed gas cylinders must have the same CGA connection as the dual stage regulator. Refer to the
Appendix A (Spare Parts section) of this manual for the Dual Stage Regulator (M1132ZX) and the Zero
Pressure Switch (M1133AR).
NOTE
NOTE