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The meters are connected to this instrument, part of a system designed to prove that each meter is accurate. Known as a small volume prover, the FMD003 gives Instrumentation Engineering Technology students and Instrumentation apprentices experience in automated process control and measurement systems.
“Proving a meter gives accurate and repeatable readings is important for everything from controlling a process to calculating royalties based on volume,” says SAIT instructor Ed Bons (EET ’73).
This prover is unidirectional, meaning a motorized piston in the canister moves in one direction to displace a specified volume.
Software drives each displacement, called a run. A printout compares volumes from multiple runs — usually taking five minutes — with the volume shown on a meter. If there’s a difference, the meter is adjusted to align with the prover.
This prover can displace two gallons; the largest in the FMD line displaces 168.
In SAIT’s lab, this machine is used to prove 20 types of meters commonly found in industry.
Water in the prover can be heated until it steams or cooled to near freezing so students can see how weather affects meters — important because provers are often mounted on a trailer for use in the field.