 2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
0.1-3
SERVICE MANUAL ON / OH-900 and ONH-2000
0.1 Overview of the ON/OH-900; ONH-2000 modifications………………………..…0.1-5
1 FAULTS
1.1 IR cell test displays ++++ see 2. 3 .............................................................................1.1-1
1.2 No gas flow.....................................................................................................................1.2-1
1.3 The flow rate is not stable .............................................................................................1.3-1
1.4 The base line of the TC cell cannot be adjusted to zero ............................................1.4-1
1.5 Analysis time too long....................................................................................................1.5-1
1.6 High blank value.............................................................................................................1.6-1
1.7 Erratic results..................................................................................................................1.7-1
1.8 The LED for the temperature regulation of the infrared cell or the thermoconductivity
cell does not flash...........................................................................................................1.8-1
1.9 No analysis start.............................................................................................................1.9-1
1.10 The message "No Water Flow" appears on the display ..........................................1.10-1
1.11 Furnace temperature too high.....................................................................................1.11-1
1.12 The base line of the TC cell is negative, see 2.12 ...................................................1.12-1
1.13 No furnace power during the analysis........................................................................1.13-1
1.14 The sample drop motor does not rotate.....................................................................1.14-1
1.15 Faulty electronic drivers...............................................................................................1.15-1
1.16 Noise or drift of the infrared baseline .........................................................................1.16-1
1.17 Furnace cut-off during analysis...................................................................................1.17-1
1.18 Beeper responding.......................................................................................................1.18-1
1.19 Saved data is lost.........................................................................................................1.19-1
1.20 The upper electrode becomes dark............................................................................1.20-1
1.21 The chopper motor doesn`t rotate..............................................................................1.21-1
1.22 The samples make bubbles ........................................................................................1.22-1
1.23 Spare parts kits ............................................................................................................1.23-1
1.24 Unstable current...........................................................................................................1.24-1
2 ADJUSTMENTS, TEST AND FUNCTION EXPLANATION
2.1 Gas flow controller adjustment and jumper settings ...................................................2.1-1
2.2 Pressure switch..............................................................................................................2.2-1
2.3 Infrared zero-baseline, control and adjustment...........................................................2.3-1
2.4 IR-source voltage setting...............................................................................................2.4-1
2.5 Temperature regulation of the IR-cell...........................................................................2.5-1
2.6 Pneumatics for furnace lift............................................................................................2.6-1
2.7 Flow rates .......................................................................................................................2.7-1
2.8 Furnace lift adjustment ..................................................................................................2.8-1
2.9 Linearization ...................................................................................................................2.9-1
2.10 Balance programming:.................................................................................................2.10-1
2.11 .......................................................................................................................................2.11-1
2.12 TC zero baseline adjustment ......................................................................................2.12-1
2.13 Diagnostic printout .......................................................................................................2.13-1
2.14 Temperature regulation of the TC Cell.......................................................................2.14-1
2.15 Water flow and furnace temperature sensing board ON21......................................2.15-1
2.16 The furnace control board PW13...............................................................................2.16-1
2.17
2.18 Sample drop motor and the motor switch adjustment ..............................................2.18-1
2.19 Hot extraction upgrade ................................................................................................2.18-1
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