5
3.8 Analysis takes too long 46
3.8.1 Additional reasons for excessive analysis duration could be: 47
3.8.1.1 One of the IR-sources is unstable: 47
3.9 Development of dust when closing the furnace 50
3.10 Irregular results 50
3.11 The results are always 0.0000% or 00.0ppm: 51
3.12 Combustion tube - life time is too short 51
3.13 IR-cell temperature control is out of range 53
3.14 Breaker turns off at the beginning of combustion 53
3.14.1 Further causes could be found in the oscillator circuit 55
3.15 Breaker turns off at the end of the analysis 57
3.16 Furnace - large collection of dust when opening 58
3.17 No or low oxygen pressure 59
3.17.1 Possible faults on the front panel of the analyzer 59
3.17.2 On the rear-side of the analyzer: 60
3.17.3 Inside the analyzer: 60
3.17.3.1 Oxygen solenoid valve (V5) may be defective 60
3.17.3.2 Outflow valve does not close 61
3.17.3.3 If the voltage on the outflow valve is constantly at 24 V, then: 61
3.17.4 Other faults 61
3.18 No oxygen flow 61
3.19 Status window message: "Waiting for stability" 61
3.19.1 Reasons for instability: 62
3.19.1.1 Too low deviation value 62
3.19.1.2 Too high noise 62
3.19.1.3 Too high drift 62
3.20 Furnace opens with delay after the end of analysis 62
3.21 Oxygen pressure falls when the furnace opens 64
3.22 Combustion without starting analysis 65
3.23 Crucible cracks or melts 68
3.24 Analysis doesn’t start / no peak on screen 68
3.25 Vibrations on setting 2 68
3.26 Analysis cycle stops before the peak begins 69
3.27 Chopper motor doesn‘t rotate 70
3.28 Sample burns but no peak on the screen 70
3.29 IR signal does not come down to the base line at the end of analysis 70
3.29.1 Too long combustion of a very low carbon sample 71
3.29.2 Copper oxide has a bad quality 72
3.29.3 Path window is not sealed or it is broken 72
3.29.4 Flow stops during analysis 73
4 Adjustments, tests and working instructions ................................................................................... 74
4.1 Gas flow controller adjustment and jumper settings 74
4.1.1 Jumper settings 75
4.1.2 Gas flow regulation 76
4.2 Infrared base line adjustments 78
4.2.1 Infrared cell modification - general information 78
4.2.2 General test points 81
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