Because the instrument is essentially solid-state, there are no moving parts, seals or bearings. This virtually eliminates the need for maintenance. It is usual for XL7 viscometers to run on-line continuously for many years and maintain full performance without any intervention whatsoever.
Instruments may sometimes be required to be checked annually as part of a Quality Management procedure, but this is by no means a mandatory requirement for the XL7. However, it can be useful or reassuring to check calibration from time to time, so the processor unit includes diagnostic parameters for this purpose. Hydramotion also offer an inspection and calibration service if this is required.