Seminar on, “ CALIBRATION TECHNIQUES FOR MAGMETERS” Presented By, Bhushan Patil Guided By, Prof. A.S. Kulkarni

Wide area of use Process industry Chemical plants Pharmaceutical industry

Obstruction flow meters Velocity flow meters – Including Moving Member meters Positive Displacement meters Variable area meters Electronic meters

Process media Liquid Gas Density (Specific Gravity) Viscosity Pressure Temperature Velocity

Good Accuracy Means Good Repeatability Good Repeatability Does Not Necessarily Mean Good Accuracy Poor Repeatability Means Poor Accuracy

Advantages Over Other Technologies No moving parts No pressure drop Flow rate independent of viscosity, temperature, and density Minimum upstream piping requirements Electronics interchangeable without regard to size

Measure dirty liquids with solids Electronics interchangeable without regard to size Measure highly corrosive fluids Very large turndown Linear output

Faraday's Law, states that the voltage induced across any conductor as it moves at right angles through a magnetic field is proportional to the velocity of that conductor.

Mathematical Representation:- E=K*B*D*V Where E=The induced voltage generated K=The unit conversion constant B=The magnetic field strength D=Distance between the probes V=velocity of conductor

No Moving Parts Very Wide Range ability Ideal For Slurries Unobstructed Flow Path

Liquid Must Be Conductive Physical Pressure and Temperature Limits

Calibration is required for: Testing a new instrument Testing an instrument after it has been repaired or modified Periodic testing of instruments Testing after the specific usage has elapsed Prior to and/or after a critical measurement

When observations are not accurate or instrument indicators do not match the output of a surrogate instrument After events such as: An instrument has had a shock, vibration, or exposure to adverse conditions, which can put it out of calibration or damage it. Sudden weather changes

Safety procedure Wastages Quality

It is a comparison of measuring equipment against a standard instrument of higher accuracy to detect, correlate, adjust, rectify and document the accuracy of the instrument being compared.

Density Viscosity Pressure Temperature Conductivity Hazardous or corrosive

Calibration interval Maintain minimum risk

On sight calibration Laboratory calibration GRAVIMETRIC CALIBRATION VOLUMETRIC CALIBRATIO

A flow meter can be calibrated gravimetrically by weighing the quantity of liquid collected in a vessel. The vessel is weighed and the weight (in air) of the fluid collected is noted

M=W *{ 1+ρ air * [ 1 / ρ f - 1/ ρ w ] } Where M = is the mass (kg), W = is the measured weight (kg) ρ air = is density of air (kg/m 3 ), ρ f = is density of the fluid (kg/m 3 ), ρ w = is density of the calibration weights (8,000 kg/m 3 )

The measurement of the quantity of liquid collected may be carried out volumetrically by collecting a known volume of liquid in a container

Field calibration with radiotracer transit time method Reference meter Tracer method Insertion meter Clamp-on ultrasonic meters

Meter must be in condition There should not any uncertainty

Correct instrument will be adjusted More compatible with multifunction calibrators

Entire loop is not verified within tolerance Mistakes on re-connect Less efficient use of time to do one calibration for each loop instrument as opposed to one calibration for the loop

Chemical industry Water and wastewater Hydraulic transport, liquid products with up to 50% solids content Paper and wood pulp production Pharmaceutical Food and beverages Filling and dispensing processes Highly abrasive slurries High-pressure industrial processes Partially filled pipelines

Need of calibration definition of calibration Calibration of fluid and its conditions Calibration frequency Methods Expectation Advantages Disadvantages

Richard Paton,” National Engineering Laboratory, Scotland”, UK NEL Technology for life] magazine/2010/february/automation-basic-magnatic- flowmeters/technology