Bacharach 450 Operating & Maintenance Instructions
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ECA 450 CalibrationInstruction 0024-9400 55Procedure:1. Enter Calibration List screen; then choose HC per Section 3.3 to displaythe CALIBRATE HC screen. At the conclusion of this step the pumpshould be running.2. Using the Gas Fixture shown in Figure 3-1, attach a CH 4 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 CH 4 gas cylinder.The calibration range is from 1 to 3%. An applied value that is outsidethis range will cause the message “Bad Calibration Entry” to appear.Typical Calibrate HC Screen During Calibration:««««CALIBRATE HC««««Measured 1.93 %Applied 2.50 %5. 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.3.8 Calibrate CO-LO SensorThis screen is used to span the Carbon Monoxide Low channel (0 – 4,000 ppmCO) to a known gas level. This procedure also includes H 2 compensation.Material Required:• Calibration Gas Fixture (Section 3.2)• Gas Cylinder: 500 ppm CO in air (refer to Section 6.2)• Gas Cylinder: 1000 ppm CO & 1000 ppm H 2 in Nitrogen(refer to Section 6.2)Procedure:1. Enter Calibration List screen; then choose CO-LO per Section 3.3 todisplay the CALIBRATE CO-LO screen. At the conclusion of this step thepump should be running.2. Using the Gas Fixture shown in Figure 3-1, attach a CO-only calibrationgas cylinder to the analyzer’s GAS inlet port. |
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