Belt filter predictive maintenance

Hi everyone
I have a peculiar problem. We have a belt filter which is pressurised inside a vessel. So internally there are no instruments to monitor the unit. We are facing frequent problem with the belt movement. Sometimes the belt starts to break and we cannot identify the issue untill the damage is severe. Outside we have two pneumatic solenoid valves and two proximity sensors. Solenoid moves the belt from one side to other once the proximity is sensed.
I am looking for Instrumentation which can be installed inside of the vessel. By the way, inside the vessel slurry mixed with acidic acid flows on the belt. Please point me in some direction. Thanks
 
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