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9 Faults/Warnings
9.4 Warnings - Causes and Solutions
In general: Warnings do not affect the measurement functions.
9.4.1 LS2 Internal Resistance too High
This message is output if the AC internal resistance (R
I
) of the ZrO
2
cell exceeds the permis-
sible limit of 200 during operation.
Possible cause:
Probe aged (worn out) Obtain a spare probe and replace.
Measurement can continue, using caution. Check accuracy by counter-measurement,
see chapter 7 Operation
– Check fuses F2, see chapter11.4.3 Fuses
– Fault in supply section electronics replace
Check the Lambda Transmitter’s electronic:
Measure the AC voltage across LT2 terminals 33 and 34, using a multimeter.
The result in mV corresponds approx. to half the AC internal resistance.
9.4.2 Offset Voltage to Air Invalid
The voltage determined during offset compensation is not permissible.
Check whether probe is in air.
If yes - check probe voltage to air.
Permissible voltage range +5 … -30 mV.
9.4.3 Analogue Inputs 1/2/3/4 Input Value too Large/too Small
The input value at the relevant analogue input is outside the permissible range.
• Check parameters 574/584/594/604 (minimum) and parameters 578/585/595/605 (maxi-
mum). Parameters 570/580/590/600 indicate the current value.
• Check wiring poles reversed?
• Check source (connected instrument).
• Analogue input card defective? Replace it.
Access to the parameters is only possible with the display and control unit or the remote dis-
play software.
9.4.4 Configuration Error at Analogue Outputs
Parameters have been set for analogue outputs not physically found. Check parameters 539,
549, 559, 569 and 530, 540, 550, 560 and compare with the fitted cards.
If necessary, replace the analogue output cards and/or processor card.
9.4.5 Service Warning 1/Service Warning 2
See chapter 6.4.2 Setting up Service Warnings.
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