Eaton Crouse-Hinds MTL Z1920C Instruction Manual
Also see for Crouse-hinds series: Operating instructionsInstruction manualOperating instructionsOperating instructionsInstruction manual
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10INM MTL 130-0175 Rev 46 FAULT FINDING AND SERVICINGWARNINGThe internals of the sensor unit operate at elevated temperatures. Take greatcare when working on an analyser that has power applied or has only recentlybeen turned off.NOTEFor those instruments supplied as separate electronics and sensor units, to be inter-wiredon site, always check the interconnecting wiring first. Tests are mostly described as beingperformed from the electronics end. If an open circuit condition is found, it is advisable torepeat the tests at the sensor head before drawing a firm conclusion.NOTESome tests described assume that the repairer is familiar and comfortable with electricalapparatus and simple test equipment. Apart from standard small tools, other items requiredto perform the tests described are a) digital multi meter - hand held 3½ digit type capableof resolving 0.1mv dc, 0.1ma dc and up to 30v ac. b) potentiometer trim tool. The mostconvenient way of repairing the instrument is to carry a full set of spares and substitutingknown good modules for those identified as faulty using the tests described here.6.1 Error ‘HELP’ MessagesIf a data error is detected by the microprocessor it is reported by displaying ‘HELP’ followed bya number. The meaning of these messages is as follows.HELP 1 - After finding user calibration data corrupt the backup was found to be corrupt too.Return to factory.HELP 2 - Will not be seen. Factory calibration data is corrupt. If the backup is OK it will besilently restored.HELP 3 - After finding factory setup data corrupt the backup was found to be corrupt too.Return to factory.HELP 4 - User calibration and/or setup data is corrupt. Press the UP (↑) key to recover.Factory default values are loaded for alarms, output range, cell calibration etc.After a few seconds the instrument will automatically go into the EDIT menu.After working through the edit screens (alarm settings and output range) in thenormal way, the instrument goes automatically into the CALIBRATE mode. Aftercalibrating at the high and low points, the instrument reverts to normal operation.6.2 Oxygen Sensor Resistance CheckingThe sensor temperature must be at normal operating temperature when this test is carried out.Note also that the full working temperature of the sensor is not reached until the instrumenthas been on for about 10 minutes. Pass air across the sensor via the calibration connection orthe sample inlet and check the resistance of the sensor across terminals 6 and 7 using a digitalmulti-meter set to read at least 1000 ohms. If the resistance of the sensor is more than 1000ohms and its response is sluggish, it is likely that it is faulty. |
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