A flow meter is a test device used to calculate the flow rate of process fluids and gases in industrial plants and facilities. The flow rate denotes to the speed at which a process fluid is moving through pipelines, orifices, or vessels at a given time. Control and instrumentation engineers measure this value to screen and regulate the speed and efficacy of industrial flow processes and devices. Ideally, test devices must be ‘reset’ from time to time to stop having inaccurate readings. For example, a bathroom scale that indicates 10lbs when nobody is standing on it needs to be recalibrated to specify an initial zero value. I n industrial settings, Liquid Flow Calibration is performed to ensure that measurements are accurate permitting operations to proceed in a safe and timely manner.

1. Flow Meter Calibration
Nagman Flow System &
Solution
water Meter Test Bench, Flow Meter
www.manasmicro.com

2. Introduction
• A flow meter is a test device used to calculate the flow rate of process
fluids and gases in industrial plants and facilities. The flow rate denotes
to the speed at which a process fluid is moving through pipelines,
orifices, or vessels at a given time.
• Control and instrumentation engineers measure this value to screen and
regulate the speed and efficacy of industrial flow processes and
devices.
• Ideally, test devices must be ‘reset’ from time to time to stop having
inaccurate readings.
• For example, a bathroom scale that indicates 10lbs when nobody is
standing on it needs to be recalibrated to specify an initial zero value.
• I n industrial settings, Liquid Flow Calibration is performed to ensure that

4. Electro-Magnetic Floe Meter
Electro-Magnetic Floe Meter
Size : DN 3 to DN 3000 mm
Flow Velocity : 0.5 m/s to 15 m/s
Accuracy : ±0.5%, ±0.2% of Reading

5. Coriolis Mass Flow Meters
Coriolis Mass Flow Meters:
Size : DN8~DN300
Flow Range : 8 to 2500000 Kg/hr (for
liquids)
4 to 2500000 Kg/hr (for gases)
Accuracy : 0.1% 0.2% 0.5% of Normal Flow
Range

6. Positive Displacement Flow Meter
Positive Displacement Flow Meter:
Size : DN 15 ~ DN 400
Max. Flow Range : 0.3 m3/hr to 1800 m3/hr
(Will vary based on the measured media &
temperature)
Accuracy : 0.1% 0.2% 0.5%

7. Vortex Flow Meter:
Size : DN 25 to DN 300
Flow Range : 1.3 m3/hr to 2000 m3/hr
(Water)
8.0 m3/hr to 10000 m3/hr (Air)
Accuracy : ±1.0% of Reading
Positive Displacement Flow Meter
Turbine Flow Meter:
Size : DN 4 to DN 200
Flow Range : 0.02 m3 /hr to 680 m3 /hr
Accuracy : 1.0% or 0.5% of Rate

8. What is Flow Meter Calibration
 Flow meter calibration is the procedure of comparing
the pre-set scale or metering of a flow meter to a
standard scale of measurement and adjusting its
metering to conform to the standard.
 Calibration is a vital aspect of instrumentation in a
broad range of industries that require high-accuracy
measurements with a tiny percentage of error e.g. in
Oil & Gas, Petrochemical, and manufacturing.

9. • Flow meters are calibrated by comparing and
adjusting their metering to agree with a predefined
standard.
• Flow meter manufacturers normally calibrate
their products in-house after production or send
them to an independent calibration facility for
adjustment.
• Flow meter calibration comprises comparing the
measurements of a flow meter in operation to that
of a standard flow measurement device under the
same conditions and regulating the scale of the
flow meter to be in close agreement with the
standard.

10. PROCESS FLOW METER
CALIBRATION SYSTEM
Meter Sizes : From DN10 up to DN 400
(More Sizes optional)
Flow Rates : From 1 to 25000 LPM or More
Lines : 1, 2 or 3 to suit
Calibration Campaign Time : To suit, from
30 Seconds
Calibration Methods : Gravimetric /
Volumetric / Comparison
Calibration Accuracies : 0.2% up to 0.05%
Calibration Media : Water (Correction
Factors for other liquids)

11. • Process Flow Calibration involves calibration of
a flow meter which is at present in use. Periodic
recalibration is needed as flow meter readings will
often go ‘out of phase’ over time due to variable
conditions involved in industrial processes.
• The main difference amid the two procedures is
that flow calibration is done before the meter is
sent out for use while recalibration is done after
the flow meter has been in operation for a while.
• Software tools can also be used to verify the
correctness of measurements after a flow meter
has been calibrated.

12. Head Office & Factory
Nagman Complex, No. 168/7, Chennai-Bangalore NH-4,
Chembarambakkam,
Chennai – 600 123.
Tamil Nadu.
INDIA.
Phone : +91-44-66777054, 66777055
Email : sales@nagmanflow.com, marketing@nagmanflow.com
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