7 Service and Maintenance727.3 MaintenanceDue to the extensive self-diagnosis, the LT2/KS1-DK measurement system is largelymaintenance-free. Maintenance is restricted to calibration and, when necessary,cleaning the preliminary filter from dust and other deposits, and the replacement of theZrO 2 measuring element at the given intervals.7.3.1 Checking the measurementCheck the measurement monthly, quarterly or six-monthly, depending on theapplication, see section 7.17.3.2 Wearing partsKS1-DK combination probeAverage service life 3-5 years (depending on the fuel).
