Eaton Crouse-Hinds MTL Z1920C Instruction Manual
Also see for Crouse-hinds series: Operating instructionsInstruction manualOperating instructionsOperating instructionsInstruction manual
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6INM MTL 130-0175 Rev 44 OPERATION4.1 First ChecksWith the sensor and electronic unit connected up to each other and electrical supplies, theinstrument is ready for use. Ensure that all the connections are correct and that the actualsupply voltage is the same as that set at the voltage selector. Check all piping connections fortightness.4.2 Start-upWith all the initial checks completed and found to be satisfactory, apply power tothe instrument.When power is applied the concentration read-out will display briefly its start-up messages andthen, as the sensor heater warms up, the sensor temperature controller’s display will alternatebetween indicating the rising sensor temperature and ‘ALARM’. Once the temperaturehas reached its normal level, the controller display goes to a constant display of sensortemperature. During the warm up period the concentration meter read-out and signal outputwill be seen to go up and down the scale once or twice; this is quite normal.CAUTIONUnder no circumstaces pass a combustible sample until both the catalyst and sensorare at their normal operating temperatures.The instrument is calibrated prior to dispatch and is ready for immediate use, once warmed up.User quality assurance procedures may require that a calibration check is made before use. Ifthis is the case then proceed to section 4.3, otherwise go to section 4.4.4.3 Calibration checkThe procedure requires two gases; one a standard gas with a known oxygen content ofbetween 0.5% and 2% of oxygen in nitrogen, and air. It is important that these gases containno combustible gas. The oxygen in nitrogen mixture may be obtained in cylinders from anumber of gas suppliers. The cylinder will need to be fitted with a regulator. The calibrationgases are introduced through the normal sample inlet. Either the sample will need todisconnected, or a suitable manifold of valves will need to be arranged. Any source of thenormal sample should be removed when performing a calibration check.Firstly connect the air and adjust the flow to between 150 and 250 ml/min. Allow the systemto stabilise for at least 60 seconds.When the reading is stable, press and hold the Calibrate button for approximately 8 seconds.The display will go blank for a moment and then show “H xxxx”; where H indicates that thehigh calibration point is selected. Use the up/down arrow buttons to set the reading to 20.9%,and then press the Edit button momentarily to reset the calibration. The display will nowshow “H 20.9”. Press and hold the Calibrate button for a further 8 seconds. The display willnow show “Lxxxx” where “L” indicates that the low calibration point is selected and “XXXX”is the measured value of the gas passing across the sensor.Now apply the 0.5 to 2% standard calibration gas and adjust the flow as before. Allow thereading to stabilise and use the up/down arrow buttons to set the reading to the correctconcentration. Press the Edit button momentarily to reset the calibration and return to normalmeasurement mode.4.4 CommissioningIf a calibration check has been conducted ensure the standard calibration gas connection isremoved. The air gas mixture stream may now be applied. The flow control valve should beturned fully clockwise (closed) prior to applying the mixture to the analyser. This is to avoidpassing high flow rates through the system. |
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