Flow meter & Instrument Verification

 Flow meter


Flow meter & Instrument Verification.


The methods we use are all carried out in accordance with industry standards namely the methods laid out in the National Engineering Laboratory (NEL) we suggest the following procedures are looked at carefully before making any changes to your onsite instrumentation.


 In Situ Flow Meter Verification (Wetted Verification), Best Practice.


 Flowlee carries out In situ flowmeter & Instrument verification as a preventative measure to help maintain environmental records & data, In situ verification gives you a percentage error accuracy between the Instrument under test & the reference meter carrying out the test. Alternatively In situ verification can be carried out as a resolve to Investigate any issues you may be currently experiencing with your Instrumentation & application upgrade requirements.

We believe that In an ideal world all flow meters would be verified  In situ, hence avoiding differences In fluid & the Installation that changes the calibration of the flow meter in question. In practice In situ verification can only currently be achieved with two devices these are an ultrasonic reference meter or an Insertion probe reference meter. When installed by Flowlee services our reference meters can be traced back to a calibrated benchmark to achieve a +/- 2% accuracy this Is also supported by our two meter reference test procedure that allows us to cross reference our own Instrumentation whilst on site.


We stress that you should not carry out a wetted calibration or apply any offset calibration factors to any flow meter following an In situ verification, our preferred method Is to monitor the Instrument In question over a period of time enabling us to build a clear picture before jointly making a decision that best suits you the customer. If you require a wetted calibration we suggest that you utilise our calibration facility allowing us calibrate your Instrument against a certified test platform.


In Situ Flow Meter Verification Checks Can Show That The Calibration Of The Flow Meter Primary Has Not Shifted.


Flow meter verification can usually be achieved In one day & always requires a full bore pipe & full access to your Instrument primary & secondary devices. Using the most advanced transit time ultrasonic flow meters we can carry out a verification non Intrusively by clamping our transducers onto the pipe In question, additionally we require a section of pipe that has the correct up & down stream clear diameters to carry out the test accurately. One of the ultrasonic flow meters strengths Is that the Instrument can be checked for calibration against diagnostics & the applications sound speeds when Installed.

Additionally If you have a tapping point available we can also Install an insertion probe that can measure your flow profile before being setup for a verification test.


In Situ Electronic Calibration Of  Equipment ( Dry Calibration) Secondary Practice.


Some In situ calibration equipment Is designed to verify or calibrate the flow meter secondary, or transmitter. Some of these calibrators are designed to transfer calibration information to/from other systems such as maintenance management systems. These devices allow us to check the calibration of the unit in question but to find out the meters accuracy you must either remove the meter from the field or have It calibrated at a test facility or carry out an In situ flow meter verification to acquire a percentage error offset.


Instrument Verification & Calibration.


Additionally Flowlee Services carries out In situ verification & calibrations on a number of field based Instruments, these include pressure & temperature devices & operating systems, moisture & oxygen analyzers, flue gas analyzers. Please contact us about your Instrument verification & calibration requirements as there Is a number of Instruments that we work with that may not be currently listed on our site. 


Calibration Facility.


UKAS-accredited (ISO/IEC 17025:2005) flow laboratory, backed by five decades of experience, provides high accuracy & compliance with quality assurance requirements to manufacturers worldwide. Flow rate between 2.5kg/s and 440 kg/s can be delivered & differential pressures measured up to 2500 mbar. Pipes with bore ranging from 50 mm to 500 mm can be handled in the 18m-long test line.