Maintenance
Page 10
April 2017
VAM-UM-00646-EN-04
6 Install the front cover and gasket To properly seat the cover gasket, tighten the cover
screws in a crisscross pattern
See
“Figure 6: Cover screw tightening sequence” on page 8
MAINTENANCE
Quick Recoupling
The 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 flow 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 recouple 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 recouple to the indicator ring
• Remove the cover and manually reattach the external flow indicator to the internal
magnet/piston assembly
• For rigorous cyclical applications where decoupling may occur frequently, consult
technical support
DISCONNECT ELECTRICAL POWER BEFORE REMOVING THE FLOW
METER COVER. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN SERIOUS
PERSONAL INJURY OR DEATH AND/OR DAMAGE TO THE EQUIPMENT.
Cartridge Cleaning
Body
End Fitting
Retaining Ring
Meter Spring
Cone
Internal Magnet
Indicator Magnet
Piston Assembly
Wave Spring
Pressure Seal
Figure 9: Cartridge Components
1 Disconnect the flow meter cable from the power source
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.
