Lamtec LT 2 Assembly And Commissioning Manual page 82

8 Fault Analysis/Trouble-shooting
8.2.6 D-P test gas calibration too low, not enough gas
8.2.7 D-P test gas calibration too high, dirty filter
8.2.8 Insufficient quantity of calibrating gas
8.2.9 Implausible test gas calibration, please repeat
8.2.10 Analogue input 1/2/3/4 input value too high/too low
Inadequate rise in pressure in preliminary filter during test calibration (<0.5mbar).
Possible causes:
There is no test gas at the test gas connection of the probe, or inadequate
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pre-pressure (0.3bar)
The shut-off plug valve in the PCB is not open.
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The test gas throttle in the PCB is not open sufficiently.
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The signal from the differential pressure sensor has drifted (recalibrate to "0").
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Probe preliminary filter cracked or broken (replace)
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Excessive rise in pressure in preliminary filter during test gas calibration.
Possible causes:
Test gas at the probe test gas connection has excessive pre-pressure.
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The signal from the differential pressure sensor has drifted (recalibrate to "0").
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Probe preliminary filter is dirty (clean)
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An insufficient rise in pressure is discovered during manual offset or test gas
calibration of the KS1-DK.
Possible causes:
There is no test gas or compressed air at the test gas connection of the probe,
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or inadequate pre-pressure (0,3bar)
The shut-off plug valve in the PCB is not open.
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The test gas throttle in the PCB is not open sufficiently.
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The signal from the differential pressure sensor has drifted (recalibrate to "0").
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Probe preliminary filter cracked or broken (replace)
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This message occurs when the probe temperature calculated from the probe voltage
and the concentration of gas lies outside the range of 800° - 1200° Kelvin.
Possible causes:
The O concentration entered under parameter 301 does not correspond to
-
2
that of the connected calibrating gas
Ageing/contaminated sensor? → replace.
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Infiltrated air - check tightness of seals and hose connections.
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The input value at the analogue input in question is outside the permitted range.
Range limits: parameters 574/584/594/604 (min. value) and 578/585/595/605 (max.
value).
The current input value can be read out via parameters 570/580/590/600.
Measures:
Check wiring → reversed polarity?
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Check source (connected device)
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Faulty input card? → replace
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