Eaton Crouse-Hinds MTL Z1920C Instruction Manual
Also see for Crouse-hinds series: Operating instructionsInstruction manualOperating instructionsOperating instructionsInstruction manual
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INM MTL 130-0175 Rev 47Slowly open the flow valve beneath the flow meter until a flow of between 150 and 250 ml/minis flowing.WARNINGTo avoid serious and dangerous damage to the catalyst and sensor the sampleflow must not exceed 250ml/min (0.5cuft/hr).The instrument will respond within a few seconds to show the oxygen concentration.NOTE: Combustion of the sample generates heat and it is possible, when the sample is firstapplied, that the catalyst temperature may go higher than its normal control point beforethe controller is able to react. This will cause the controller to show error condition and therelay contacts to go a fault condition. Whether this occurs or not will depend on the samplecomposition and its flow rate. The results during this transient state are valid. It is suggestedthat any external equipment (PLC’s etc) used to monitor the analyser are programmed so as toignore this situation for approximately 60 seconds after the sample has been applied.Before switching the analyser off following its use on combustible samples ALWAYS pass airthrough the analyser for a few minutes to purge out the moisture etc. formed when combustingthe sample.4.5 ProgrammingThe user programmable features are accessed by pressing and holding the Edit button forapproximately 8 seconds when the instrument is in normal measurement mode.Each subsequent momentary press of the Edit button scrolls the display through a sequence ofadjustable parameters. The order of the sequence is as follows:Alarm 1 Set point Alarm 1 Mode Alarm 1 Hysteresis Alarm 2 Set point Alarm 2 ModeAlarm 2 Hysteresis Analogue Output top scale value Return to measurement mode.NOTEOnly the LED indicators are available for the concentration alarms. No relay output isprovided on this model.ALARM 1 - Set pointThis is the first parameter to be displayed when the Edit button is pressed and held for eightseconds. The display will show “E xxxx”, and the Alarm 1 LED will flash. “xxxx” is the valueof the alarm set point and the flashing LED indicates that it is the set point of alarm 1. To theright of the display a % or ppm symbol is displayed to indicate the units of the value displayed.To change the value of the set point, press the up/down arrows until the display shows therequired value. Observe the “%” and “ppm” symbols to ensure the correct setting. Whenthe buttons are first pressed the value changes slowly and the least significant number canbe changed by giving the buttons a short “click”. If the button is kept depressed the rateaccelerates rapidly to enable large changes in value to be achieved quickly. Once the requiredvalue is displayed, press the Edit button once to store the value in the analyser’s memory.Simultaneously the display will change to show “E x” and the Alarm 1 LED will continue toflash. |
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