8 Fault Analysis/Trouble-shooting
76
8.1.3 Probe broken wire/faulty probe
This message appears if the AC internal resistance (R
I
) of the ZrO
2
measuring cell
exceeds the permitted limit value of 300 Ω in measurement mode. The warning
“Internal resistance too high” generally appears before or after the above message.
• Possible causes:
• The probe (measurement signal terminals 33 – 34) has been disconnected
• Loose contact → check terminal connections, tighten if necessary
• Check the wiring, if it is OK → replace the probe
8.1.4 No probe dynamics
No probe dynamics were registered. Check the probe
NOTE:
The test is disabled on delivery.
Activate it via parameter groups 1330 to 1334.
A check takes place to determine whether the measurement value changes by more
than the parameterised threshold value within a time that is to be defined.
8.1.5 Fault in analogue outputs
• Check the parameter assignments of the analogue outputs (P530...P569).
• Check the computer electronics of the analogue outputs and replace if necessary.
It is possible that an analogue output that is not installed has been activated
(check installed outputs)
• See sections 4.7 and 10.7
• Influence exerted upon the ribbon cable of the display due to electromagnetic
interference
(order a ferrite core)
8.1.6 Incorrect O
2
value
If a control measurement produces a different O
2
value from the one displayed
• Have you taken the wet/dry measurement factor into consideration? See graph in
section 10.14. of the appendix
• Check/calibrate the O
2
measuring probe, see 7.1
• Replace the CO/H
2
measuring cell, see section 7.3.4
• Commission the new probe as described in 6
• Measurement value too high? Infiltrated air - check tightness of seal and hose
connections.
NOTE:
During counter-measurement, take note of whether the measuring device is
measuring wet or dry. In devices with an upstream measuring gas cooler, the
measurement is always dry. The same applies to devices that draw out the humidity
using a chemical substance. The combination probe measures damp. The difference
between wet and dry measurement can be seen in the graph in the appendix
(section 10.14).
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