Accusonic 8510+ series Reference Manual page 77

Transducer Maintenance B-3
For fixed-window transducers (Models 7605 and 7625) the active elements of can be replaced from outside
the conduit, but cleaning of the acoustic window requires dewatering the conduit. These can be found on
Figures 10-5 and 10-6 on page B-15.
If the transducers are subjected to high temperatures (> 140), which can occur if the pipe is dewatered and
exposed to strong sunshine, the coupling grease between the transducer element and the window can
deteriorate. If this occurs, or whenever the transducer element is removed for inspection or replaced, a
1/32" (1mm) layer of grease should be applied to the flat face of the transducer element. Appropriate grease
obtainable from Accusonic.