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8 Service and Maintenance
8.2 Checking the LT2
8.2.1 Checking the LT2's Measuring Input
Connect a digital voltmeter between terminals 33 (-) and 34 (+), in parallel to the probe. Com-
pare the measured voltage with the probe voltage displayed (U
S
).
Range: -30 mV … +300 mV.
If the difference is less than 1 mV, the LT2 is operating correctly.
If the difference exceeds 1 mV, repeat the above step with another digital voltmeter.
NOTICE
Check the accuracy of the digital voltmeter used.
If the difference persists → exchange the instrument.
8.3 Maintenance
Check the measurement system on a monthly, quarterly or semi-annual basis, depending on
the application.
8.3.1 Consumables
Lambda Probe Average lifetime
– natural gas and light fuel oil: 3 ... 5 years
– with heavy fuel oil, coal and biogas: 1 ... 3 years
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