Flow Meter Calibration

A stream meter is a test apparatus used to quantify the stream rate of process gases and liquids in modern plants and offices. The stream rate alludes to the speed at which a procedure liquid is traveling through pipelines, openings, or vessels at a given time. Control and instrumentation architects measure this incentive to screen and manage the speed and proficiency of modern stream procedures and gadgets. 

Preferably, test gadgets must be ‘reset’ every once in a while to counteract having mistaken readings. For instance, a washroom scale that demonstrates 10lbs when no one is using it should be recalibrated to show an underlying zero worth. 

In mechanical settings, stream meters are occasionally adjusted to guarantee that estimations are precise, enabling activities to continue in a protected and convenient way. For more information, we will walk you through some of the common calibration procedures.

Recalibration vs. Flow Meter Calibration

Stream meter calibration is an undertaking toward contrasting the pre-set scale or metering of a stream meter to a standard size of estimation and altering its measurement to fit in with the standard. Adjustment is a fundamental part of instrumentation in an expansive scope of enterprises that require high-exactness estimates with an insignificant level of mistake, for example, in Oil and Gas, Petrochemical, and assembling. 

Stream meters are aligned by contrasting and modifying their metering with relation to a predefined standard. Stream meter makers normally align their items in-house after creation or send them to an autonomous calibration office for a change. 

Stream meter calibration includes looking at the estimation of a stream meter in task to that of a standard stream estimation gadget under similar conditions and changing the size of the stream meter to be in close concurrence with the standard. 

Stream meter recalibration includes calibration of a stream meter which is as of now being used. Occasional recalibration is fundamental as stream meter readings will frequently go ‘out of stage’ after some time because of variable conditions associated with mechanical procedures. 

The fundamental contrast between the two methodologies is that stream adjustment is done before the meter is conveyed for use while recalibration is done after the stream meter has been in activity for some time. Programming devices can likewise be utilized to confirm the precision of estimates after a stream meter has been adjusted.

How To Calibrate

Fluid stream meter calibration should be possible in a few different ways, yet dependably includes correlation and change of the stream meter under test to adjust to a standard. In the U.S., flow meter calibration acquired from the National Institute of Standards and Technology (NIST) is the standard, while for a large portion of Europe, the adjustment standard starts from the Van Swinden Laboratory in the Netherlands.

Piston Prover Calibration, Gravimetric Calibration, and Master Meter Calibration are some of the generally known and used calibration procedure. 

Piston Prover Calibration

In this flow meter calibration process, a distinguished volume of liquid is constrained through a stream meter under test. The cylinder prover is a round-shaped and hollow gadget with a defined inner distance across. 

It contains a cylinder which produces volumetric stream by positive dislodging. The cylinder prover technique is perfect for ultrasonic stream meter adjustment, fuel stream meter alignment, and turbine stream meter adjustment to a high level of exactness. 

To do this procedure:

  • Put an aliquot of procedure liquid in the cylinder prover and stream meter under test. 
  • Acquire the volume of liquid that was dislodged in the cylinder prover by increasing its inner distance across by the length gone by the cylinder. 
  • Differentiate this incentive with the estimation got from your stream meter and change your stream meter’s alignment in like manner.

Gravimetric Calibration

This procedure is a standout amongst the most exact and financially savvy volumetric and mass stream meter calibration strategies. The gravimetric approach is perfect for fluid flow meter adjustment in oil, water cleaning, and petrochemical ventures. 

To do this: 

  • Put an aliquot (little part) of procedure liquid in a test meter and gauge it for an exact measure of time while it streams 60 seconds. 
  • Utilize an adjusted scale to get an exact estimation of the heaviness of test liquid. 
  • After the trial is finished, occupy the test liquid into a release holder. 
  • Get the stream rate of the aliquot by isolating its volumetric load by the test term. 
  • Contrast the determined stream rate with the stream rate of the stream meter and fine-tune it to the deliberate stream rate.

Master Meter Calibration

This calibration procedure thinks about the estimation of a stream meter under test to that of a calibration stream meter or the master stream meter working at the ideal stream standard and modifies its adjustment as it needs to be. The master stream meter is normally a gadget whose, for the most part, calibration is set to a national or universal standard. 

To perform: 

  • Put the flow meter in arrangement with the stream meter under test. 
  • Analyze the readings of the flow meter and the master flow meter utilizing a deliberate volume of fluid. 
  • Adjust the flowmeter under test to accommodate with the ace stream meter alignment.


Flow meter calibration ascertains the accuracy or exactness of a measuring device, for example, mass flow meters. There are primarily two elements that establish the definition, identifying the precise correction factors, and getting the deviance from the standard. Keep in mind that flow meters need regular calibration to guarantee proper functioning.


Author’s Bio:

Sylvia Hopkins is a writer and a blogger who specializes in email marketing campaigns and ghost blogging. She writes about flow measurement instrumentation, flow measurement application, and technology. When not working, Sylvia spends some quality time with her family and friends.

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