Dwyer CPF - Manual (Page 2)

INSTALLATION
PREPARATION: Series PVF and CPF flowmeters are ready to
install as-is, although the sight tube may need repositioning so
the scale is visible after installation. First, remove the protective
caps from the connection ports. ALSO, REMOVE THE PLASTIC
SHIPPING TUBING ABOVE THE INLET CAP IN THE METER
CORE TUBE! Check that the float moves freely within the core
tube, and that no packing materials are in the meter.
MAXIMUM FLOWS (WITHOUT EFFECTING ACCURACY)
FOR UNDERSIZED PIPES CONNECTED DIRECTLY TO FLOWMETER INLETS
PIPE NPS
1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
4
6
DATA
(ID)
2
0.132
0.243
0.387
0.679
1.100
1.904
2.592
4.272
6.096
9.413
16.209
36.784
MAX. *
GPM LIQ.
1.72
2.98
4.74
8.31
13.47
23.32
31.74
52.29
74.56
115.2
198.4
450.0
ATMOS
0.864
1.59
2.53
4.44
7.20
12.5
17.0
28.0
39.9
61.6
106
241 50 PSIG
3.80
7.00
11.1
19.5
31.7
58.8
74.6
123
176
271
467
1059 100 PSIG
6.74
12.4
19.8
34.7
56.1
97.2
132
218
311
480
827
1878
MAX. SCFM AIR @ †
200 PSIG
12.6
23.2
37.2
64.9
105
182
248
408
582
804
1549
3514
* Data per Cameron Hydraulic Data. Based on 5 FPS max. liquid velocity having no effect on Series
PVF and CPF flowmeters accuracy if the inlet pipe is smaller than the meter connections.
† SCFM = 0.445 x (psig + 14.7) x (ID)2. Based on 20 FPS max. air velocity having no effect on Series
PVF and CPF flowmeters accuracy if the inlet pipe is smaller than the meter connections.
The Series PVF and CPF Flowmeters are heavy bodied meters
for corrosives and high purity fluids. They are economically priced
meters ideal for acids or de-ionized water, making them suited for
water & wastewater treatment facilities. The flowmeters are com-
prised of all plastic wetted components for maximum corrosion re-
sistance. They have a full-scale accuracy of ±2% and can be
disassembled quickly without the meter being removed from the
pipeline for easy cleaning. The Series CPF flowmeters are avail-
able with standard 3/4˝, 1-1/2˝, 3˝ and 4˝ female NPT. Optional
flange connections also available.
SAFETY PRECAUTIONS
Personnel safety should be considered before pressurizing and
operating the system. There are numerous possibilities for error
in system operation and maintenance as well as component
installation. Because human eyes must necessarily come into
close proximity with the flowmeter to read it, it is recommended
that safety shielding be used with the meter along with safety
glasses. Another protective measure is to use a sheet of
transparent, high-impact material in a broad area in front of the
meter. If hazardous, toxic, or flammable fluids are being
metered, recommended safeguards should include methods to
protect personnel from splash or rebound. A method of quick,
safe removal of dangerous fluids should also be included.
RECOMMENDED PIPING: Series PVF and CPF flowmeters
generally have no special straight run or other piping
requirements. Inlet piping should be the same size as the meter
connection. Some effect on meter accuracy may occur at high
flow velocities if inlet piping guidelines are violated. Please refer
to the table below. When installing on different size pipe, use
standard pipe adapters and come into the meter inlet with a
nipple 8 diameters long of the same size for greatest accuracy.
Control valves should be mounted on the outlet side of the
meter. The use of a three valve manifold around the meter is
suggested (per Figures 2 & 3) as it allows uninterrupted process
flow while the meter is being cleaned.
SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: Series PVF: PVC, fluoroelastomer O-rings;
Series CPF: CPVC, fluoroelastomer O-rings.
Temperature Limits: See operating limits (Next page).
Pressure Limits: See operating limits (Next page).
Accuracy: ±2% of full scale.
Repeatability: ±1/2% of indicated flow rate.
Process Connections: 3/4˝, 1-1/2˝, 3˝ and 4˝ female NPT with
optional flange connection available.
Weight: 3 lbs (1.4 kg) for 3/4˝, 9 lbs (4.1 kg) for 1-1/2˝, 14 lbs
(6.4 kg) for 3˝, and 18 lbs (8.2) for 4˝.
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