Operating Instructions - Snap-on Equipment

PC MaintenanceNew NO x SensorNew NO x sensor procedure is required when the cell is replaced, however periodicrecalibration is necessary as prompted during the normal Gas Calibration sequenceor when the NO x warning appears. Perform a new NO x sensor initialization wheneverthe NO x sensor is replaced, which should only be done by qualified personnel or whenthe NO x warning appears.To perform a new NO x sensor initialization,1. Press the Calibration button and choose New NO x Sensor from the menu.— The New NO x Sensor Initialization window opens.The procedure then followed is the conventional gas calibration procedure.See Gas Calibration, page 3G-1.If the new NO x sensor initialization fails,1. Verify that the gas bottle is properly attached.2. Verify that the pressure gauge reads at least 30 psi (207 kPa).3. If the bottle is properly attached and contains the appropriate psi, enter theSetup window to verify that the gas calibration tag values are correct forthe bottle.4. Rerun the new NO x sensor initialization.Zero CalibrationIn normal operation the gas analyzer frequently performs a zero calibration. Duringthis check, the gas analyzer submits clean air, room air, into the sample system toverify that the analyzer reads properly when there is no gas present in the samplecell. FGA periodically performs zero calibrations as requested by the gas analyzer.In addition, you may perform a zero calibration at any time.To perform a zero calibration,1. Press the Gas button and choose Manual Meters from the menu.orSelect the 1 Manual Meters command.3G-5