8 Fault Analysis/Trouble-shooting
78
8.2 Warning indicator via LED line in the LT 2/KS1-DK
As a rule, warnings do not have any influence on measurement function.
Indication via LED line, LEDs 7 to 12, LED 12 lights up
LED
12 11 10 9 8 7 Warnings
No warning active
Internal resistance too high
Offset outside limits
No reference air
D-P offset calibration too low, not enough gas
D-P offset calibration too high, dirty filter
D-P test gas calibration too low, not enough gas
D-P test gas calibration too high, dirty filter
Insufficient quantity of calibrating gas
(2)
Probe absolute pressure too high/too low
(2)
Probe temperature too high/too low
Faulty probe temperature sensor
(2)
Invalid test gas calibration
(2)
Implausible test gas calibration, repeat
Analogue input 1: Input value too high/too low
Analogue input 2: Input value too high/too low
Analogue input 3: Input value too high/too low
Analogue input 4: Input value too high/too low
Analogue outputs configuration error
Service warning 1
Service warning 2
No probe dynamics
(1)
Dynamics test initiated
(1)
(1
)
– Only relevant when used with integrated O2 control
(2)
– Not relevant to the version described here
8.2.1 Internal resistance of probe 1 too high
This message appears if the AC internal resistance (R
I
) of the ZrO
2
measuring cell
exceeds the permitted limit value of 200 Ω in measurement mode.
Possible causes:
Probe has aged (worn) → purchase replacement probe and replace old probe
Measurement can only continue to operate with reservations. Check measurement
accuracy, see section 7.
- Check F2 fuses, see section 10.6 of appendix
- Fault in power pack electronics → replace
Checking the LT 2K electronics:
Measure the alternating voltage over terminals 33-34 of the LT 2 using a multimeter.
The display in mV roughly corresponds to the display of half the AC internal resistance
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