Oval gear flow meter stalled or not counting — how to troubleshoot?

Three common causes of rotor stalling:

1) Debris in measuring chamber (most frequent): check for a torn filter element, disassemble and clean the gear chamber, replace the filter; 2) Fluid solidification: HFO and resins solidify at low temperature and seize the gears — steam-trace to restore fluidity, then rotate by hand; 3) Gear wear: long-term service on low-lubricity fluids (e.g. gasoline) widens gear clearances — return the measuring insert for replacement.

Prevention: choose mesh size per viscosity, drain filters regularly, purge lines before long shutdowns.