Install Instructions

©Copyright 2016 Dwyer Instruments, Inc. Printed in U.S.A. 8/16 FR# 443560-00 Rev. 1
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [e-mail]
INSTALLATION DOS AND DON’TS
To obtain satisfactory operation from a HFPC & HFPS meters, the following points
should be considered:
DO:
• Install a pressure gauge near the inlet of the meter
• Place throttling valves at the outlet of the meter
• Use pipe sealer on the connections
• Install solenoid valves at meter outlet (as far downstream as possible)
• Mount in any orientation: vertical, horizontal or upside down
DO NOT:
• Place restrictions between the meter’s pressure gauge meter inlet
• Use in systems where reverse ow is possible
• Place meter in non-aligned piping
• Over-ow the meter by more than 150% of maximum reading
• Operate at pressures and temperatures greater than specied
• Be mounted near hot pipes or equipment which can cause damage to the pressure
vessel
• Use in systems where the assembled piping is not supported. Externally applied
piping forces may cause the meter to rupture or malfunction.
OPERATION
The meters are tubular, with all internal wetted parts sealed within the body casing
(5). Running through the center of the body casing is a tapered center shaft which is
centered in the bore. Encircling the shaft is a sharp-edged, oating metering poppet
(6). The metering poppet is held in the “no ow” position by the biased return spring
(4). As the ow moves through the meter it creates a pressure differential across the
oating orice disk, forcing the disk and transfer magnet against the return spring. As
ow increases, the pressure differential across the metering poppet increases, forcing
poppet to move along the tapered center shaft. As ow decreases, the biased return
spring forces the poppet down the tapered center shaft, returning to the “no ow”
position.
Figure 1 (Flow Meter Cross Section)
Reading the Meter
Notice the black reference line which runs 360° around the metering poppet. This
reference line moves under the scale in direct relation to the movement of the poppet.
When uid is owing, the ow rate through the meter is read by lining up the black
reference line with the closest rate line on the ow scale.
Specic Gravity or Density Effect
Standard meters are calibrated for WATER with a specic gravity of 1.0. The oating
disk meter is affected by uid density as are most other similar type meters. HFPC &
HFPS meters have less of this effect because of the sharpness of the oating orice
disks being used. The indicated ow reading will read high for heavier uids and low
for lighter uids. A corrective factor can be applied to the standard scale or a special
scale can be added at additional costs. When measuring uids with other specic
gravities, the basic equation below can be used to develop corrected readings.
CONTAMINATION AND FILTRATION
Recommended Filtration
System ltration of at least a 74 micron lter or a 200 mesh screen is recommended. It
has been found that if inadequate ltration has caused meter failure, it will normally fail
in the open position. Some systems may require a magnetic lter. IMPORTANT: Meter
damage caused by excessive contamination is not covered under warranty.
Stabilized Contamination
The goal of ltration is to create effective protection from system contamination.
Proper ltration stabilizes contamination to allow uid components to function properly.
A uid system is considered stabilized when, “contamination in” equals “contamination
out”. Proper ltration must reduce initial contamination to a stabilized level within an
acceptable time period. The system should be stabilized in time to prevent premature
wear or damage to meter components.
MAINTENANCE
Upon nal installation of the Series HFPC and HFPS Plastic Flow Meters, no routine
maintenance is required. A periodic check of the system calibration is recommended.
The Series HFPC and HFPS is not eld serviceable and should be returned if repair
is needed (eld repair should not be attempted and may void warranty). Be sure to
include a brief description of the problem plus any relevant application notes. Contact
customer service to receive a return goods authorization number before shipping.
For WATER Meters use: 1.0/Specic Gravity x scale reading