Bacharach 450 Operating & Maintenance Instructions
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Calibration ECA 45058 Instruction 0024-94003.10 Calibrate NO SensorThe following procedure spans the optional Nitric Oxide sensor to a knowngas level.Material Required:• Calibration Gas Fixture (Section 3.2)• Gas Cylinder: 250 ppm NO in Nitrogen (refer to Section 6.2)Procedure:1. Enter Calibration List screen; then choose NO per Section 3.3 to displaythe CALIBRATE NO screen. At the conclusion of this step the pumpshould be running.2. Using the Gas Fixture shown in Figure 3-1, attach an NO calibration gascylinder to the analyzer’s GAS inlet port.3. Adjust regulator of calibration fixture for a flow meter indication ofapproximately 2 SCFH.4. Wait until Measured reading on screen stabilizes (approximately3 minutes). Then use the ∧∨ and < > keys to enter an Applied value thatequals the concentration stamped on the NO gas cylinder.The calibration range is from 10 to 550 ppm. An applied value that isoutside this range will cause the message “Bad Calibration Entry” toappear.Typical Calibrate NO Screen During Calibration:««««CALIBRATE NO««««Measured 235 ppmApplied 00250 ppm5. Press ENTER to calibrate the analyzer’s Measured value to that of theApplied value; after which the message “Good Calibration” should appearalong with the Calibration List screen being redisplayed.If the message “Sensor Output Low” or “Sensor Not Calibrated” appears,refer Section “5.4 Troubleshooting Guide.”6. Turn off regulator; then remove gas cylinder from calibration fixture. |
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