A formed subsidiary of nagman gropu ofering comprehensive calibration solution with their product and systems. Visite :http://nagmanflow.com/

1. Gas meter calibration system
Nagman Flow System &
Solution
water Meter Test Bench, Flow Meter
www.manasmicro.com

2. Introduction
• Gas meter calibration system has become an essential nowadays.
Numerous methods are applied for performing gas meters’ calibration.
• Bell Prover: This is actually a calibrated vessel with well-known volume
characteristics. It is often used as a primary standard.
• The Bell Prover provides a certain volume to the gas meter under test
and thus a direct comparison between the meters' reading and the
volume’s value can be performed. This method is mainly used for
calibrating small domestic and diaphragm meters.
• Gravimetric method: A very precise weighing scale is used to define the
amount of gas that actually flows through the meter during the
calibration procedure. This method is measured to be very accurate.

4. GASCAL Series
 A Boon for Calibration of Domestic Gas Meters – OEMs,
Hotels, Hospitals & R&D Institutions.
 Flow Rates : 0.018 to 6 Cu.M/Hour
 Suitable for Gas Meter Sizes : G1.6, G2.5, G4, G6
 Bell Prover : Capacity 20/100/200 Litres
 Accuracy : ±0.2% & ±0.5% (Traceable to ISO/IEC 17025
Accredited Laboratory).
 Upstream/Downstream Pressure & Temperature
Measurement
 D.P. Gauges (for measurement of pressure loss) : 0 to 1.0
Inch of Water (0 to 250 Pa)
 Meter Clamping : Pneumatic
 Simultaneous Calibration of multiple Meters (Provision to
mount 2/4/6/8 Meters)

5. What is Flow Meter Calibration
 Test Bench: It is a
comprehensive system
which uses master meters
as reference standards. The
same amount of volume
flows through the master
meter and the gas meter
under test, and the two
meter readings are
compared to each other.
 This Gas meter Calibration
method is widely used by
many calibration
laboratories all over the
world. Depending on the

6. Before continuing with the analysis of the Test
Bench method of calibration, it is vital to give
some information about the metrological
characteristics of the most common types of gas
meters. The air enters through the filters and flows
through the master meter.
The flow is adjusted via the control valves and the
speed of the fan. The air passes through the
meter under test and returns to the room exiting
from the fan.
A temperature and a pressure sensor are placed
on each meter (master meter and meter under
test). The test bench must have the capability to

7. • 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.

8. 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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