ST51A/ST75A/ST75AV Mass Flow Meters MAINTENANCE
Fluid Components International LLC 65
4 MAINTENANCE
The FCI instrument requires little maintenance. There are no moving parts subject to wear in the instrument. The sensor assembly
exposed to the process media is composed of 316 SS and Hastelloy C.
Without detailed knowledge of the application surroundings and process media, FCI cannot make specific recommendations for periodic
inspection, cleaning or testing procedures. However, some general maintenance is offered below. Use operating experience to establish
frequency of maintenance.
Calibration
Verify the calibration of the output and recalibrate every 18 months at a minimum.
Electrical Connections
Inspect cable connections on terminal strips and terminal blocks. Verify that terminal connections are tight and physically sound with no
sign of corrosion.
Remote Enclosure
Verify that the moisture barriers and seals protecting the electronics in the local enclosure are adequate and that no moisture is entering
the enclosure.
Electrical Wiring
Inspect the system’s interconnecting cable, power wiring and flow element wiring on a common sense basis. Inspect the conductors for
corrosion and the cable insulation for signs of deterioration.
Flow Element Connections
Verify the seals are performing properly and that there is no leakage of the process media. Check for deterioration of the gaskets and
environmental seals.
Flow Element Assembly
Remove the flow element (insertion type, ST51A) or instrument/tee assembly (inline type, ST75A/ST75AV) for inspection based on
historical evidence of debris, foreign matter or scale build-up, or plant shutdown schedules. Check for corrosion, stress cracking and build-
up of oxides, salts or foreign substances. The thermowells must be physically intact and free of contaminants. Any debris or residue build-
up could cause inaccurate flow indication. If necessary, clean the flow element with a soft brush and available solvents (compatible with
stainless steel). Apply thread sealant to pipe threads before reinstalling the ST75A/ST75AV.
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