Bacharach MGS-550 User Manual

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Bacharach MGS-550 User Manual Manual pdf 37 page image

MGS-550 Fixed Gas DetectorP/N: 1100-1000 Version 1 37NOTICEWhen entering the functions F-02 (zero adjustment) or F-03 (span adjustment), theinstrument will automatically enter OFFLINE mode. The instrument will remain OFFLINEuntil either the OFFLINE mode is canceled using function F-01 (see section 4.3.1: OfflineMode (F-01) on page 25), or the OFFLINE mode times out within 30 minutes after theadjustment has ended. This is to avoid false alarms caused by residual cal gas.If the adjustment has not been completed, the instrument will abort the zero or spanadjustment after 5 minutes of the last of interaction. No new data will be saved and theinstrument remains OFFLINE.5.2.2 General Procedure• Ensure the instrument has been powered on for at least 1 hour prior to beginning the sensoradjustment procedure. For semiconductor sensors, you must wait at least 24 hours.• Attach the pressure regulator to the calibration gas cylinder.• Attach tubing to the pressure regulator.• Attach calibration adapter to the tubing.• For the general purpose type sensors (see figure below), connect the tubing to the calibration port(the barbed fitting) of the splash guard.• Push the calibration adapter over the sensing head assembly.• The gas flow should be approximately 0.3 to 1.0 L/min.• Access the appropriate function (as needed) and begin the zero, span, or bump test.•NOTICEIf the intended operation is at higher altitudes, the factory calibration will result in areading that is lower than the reading at sea level (a result of reduced partial pressure).A new span adjustment is recommended if the altitude or the ambient pressure ischanged. The factory calibration is set to sea level.www. .com information@itm.com1.800.561.8187