MAINTENANCE
BEFORE ATTEMPTING TO REMOVE THE FLOW METER FROM THE LINE, CHECK THE SYSTEM TO CONFIRM THAT LINE
PRESSURE HAS BEEN REDUCED TO ZERO PSI. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN SERIOUS
PERSONAL INJURY OR DEATH AND/OR DAMAGE TO THE EQUIPMENT.
1 . Remove the flow meter from the line . Remove excess piping from meter .
OTEE:
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It is not necessary to remove the transparent dust guard from the meter to remove the meter from the line . If you
choose to remove the dust guard assembly, see
"Removal of Dust Guard" on page 12
2 . Thoroughly wipe off the entire flow meter surface using mild detergent or isopropyl alcohol .
DO NOT USE AROMATIC HYDROCARBONS, HALOGENATED HYDROCARBONS, KETONES OR ESTER BASED FLUIDS ON
POLYCARBONATE LENS. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE METER.
3 . Remove the inlet cap from the flow meter, noting the sequence of disassembly for later reference (during reassembly) .
4 . The internal parts are secured with a retaining ring . Remove the retaining ring and the internal wetted parts from the
flow meter .
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If internal parts do not slide freely from flow meter, use a wooden dowel inserted into the outlet port of the meter to
push the parts out .
5 . Place all parts on a clean work surface . Clean and inspect all parts . Replace any that appear worn or damaged .
Check inlet port O-ring for damage and replace if required .
FIELD REPLACEMENT OF THE SPRING, METERING CONE AND/OR PISTON/MAGNET ASSEMBLY MAY RESULT IN CHANGES
TO THE CALIBRATION OF THE FLOW METER.
6 . Reassemble the spring, then the piston/magnet assembly and the retaining ring into flow meter .
7 . Install the metering cone/spider plate assembly, retaining spring, and secure with the inlet cap .
8 . Reinstall the meter to the line .
Removal of Dust Guard
To remove the dust guard for cleaning or replacement, simply loosen the end fitting located at the bottom of the meter and
slide the end cap, dust bumper, and the dust guard off the bottom of the meter, taking care to avoid damaging the O-ring seal
between the end cap and the dust gland .
Quick Re-Coupling
This piston-type variable area flow meter is inherently less sensitive to shock and vibration than other variable area designs .
The unique magnetic coupling also eliminates the need for mechanical linkages that can wear or loosen over the functional
life of the meter .
However, a pressure spike or extreme flow surge can cause the piston to move at such rapid speed that it disconnects the
piston magnet and the external indicator ring . If this occurs, use one of these procedures to re-couple the magnet and the
external indicator ring:
• If the system permits, simply change flow rate from “no flow” to “full flow” allowing the moving piston to magnetically
re-couple to the indicator ring .
• For rigorous cyclical applications where de-coupling may occur frequently, consult the technical services staff for
further recommendations .
Maintenance
Page 12
September 2014
VAM-UM-00551-EN-03
www.
.com
1.800.561.8187
