OPERATING PRINCIPLE
The flow meter is a variable area instrument . A sharp-edged orifice
, located within the piston assembly
, forms an
annular opening with the contoured metering cone
. The piston assembly carries a cylindrical PPS/ceramic magnet
that
is magnetically coupled to an external indicating magnet
which moves precisely in direct response to movement of the
piston . A calibrated spring
opposes flow in the forward direction .
The Hedland variable area flow meters are the most readable products in their class . Brightly colored indicators move over the
graduated, linear flow scale
which contains bold, easy to read numeral and gauge marks . The enhanced resolution virtually
eliminates parallax problems associated with competitive, direct reading flow meters .
16
1
2
3
11
4
5
6
7
8
9
10
12
13
14
15
FLO
W
1 Orifice
9 Spider plate
2 Piston assembly
10 Retaining spring
3 Metering cone
11 Pressure seal
4 Internal magnet
12 End fitting
5 Flow indicator
13 End cap
6 Spring
14 Body
7 Flow scale
15 Guard
8 Retaining ring
16 Guard seal/bumper
Table 1: Meter components
Operating Principle
Page 5
September 2014
VAM-UM-00551-EN-03
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.com
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