Dwyer instruments, inc – Dwyer CPF User Manual

Page 8

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000

www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.

Fax: 219/872-9057

e-mail: [email protected]

APPARENT
METER READING
MIGRATION
(reading changes
but flow appears
constant)

LEAKAGE

Frequently caused by use of soft disc type
valves, which may need to be replaced with a
valve more suited to flow control.
Can also be indicative of changing fluid
conditions (density, viscosity, etc.). Problems
with other elements of the flow system, including
leaks, clogged filters, pump/compressor wear,
etc. may first appear as a change in meter
reading — one of the functions of a flowmeter.

If at the junction of the body and sight tube, it is
indicative of either (a) damaged O-ring (most
common); (b) damaged sight tube; or (c)
damage to the gland section of the body. It may
also be caused by improper reassembly of the
flowmeter in the field. If there is leakage at the
pipe connections to the meter, it is probably
caused from over-tightening pipes on a prior
installation (or the initial installation, particularly
with PVC or CPVC flowmeters).

Verifying the proper fluid conditions are known and
applying correction formulae as needed will
remedy problems associated with changing fluids.
Cleaning, servicing, and replacement and/or repair
of other system components may be required.

Replace any damaged parts immediately; using
the proper assembly procedures indicated in this
instruction and the assembly detail drawings.
Remove the body and inspect for damage — if
none is visible, check pipe threads, reapply proper
thread lubricant/sealant, and reinstall.
If leak persists, replace meter body.

NOTE: All Series PVF and CPF flowmeters are hydrostatically pressure tested before they are shipped. Dwyer Instruments, Inc. encourages you to
contact the factory with any questions regarding proper installation and operation of Series PVF and CPF flowmeters.

Printed in U.S.A. 10/09

FR# R1-443618-00 Rev.1

F-23:TEMPLATE 10/27/09 4:07 PM Page 8

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