The Series RMV II Rate-Master
®
flowmeters employ a target-
type design combined with a magnetic linkage driving a pointer
over a direct reading scale. This unique construction delivers ±5%
of full scale accuracy while enabling leakproof operation at pres-
sures to 3000 psig (206.7 bar). Solid machined brass meter body
is ideal for air or water flows. Dial face body fits standard 4-1/2˝
mounting hole layouts per ANSI B40.1. Inlet and outlet threads are
3/4˝ female NPT. A 1/2˝ reducing bushing is available at extra cost.
Scales are calibrated for air or water at standard conditions.
CALIBRATION
All standard RMV II Rate Master
®
flowmeters are calibrated at the
factory for use with scale in a vertical position and should be
installed that way for maximum accuracy.
The unit will normally retain its accuracy tolerance for the useful life
of the device. If you want to check the accuracy, do so only with
instruments of certified accuracy. Do not attempt to check accura-
cy with other flowmeters piped in series. Even minor variations in
piping and back pressure can cause significant differences in indi-
cation. If in doubt, return the flowmeter to the factory for a calibra-
tion check.
LOCATION
Select a location where the flowmeter can be easily read and ambi-
ent temperature will not exceed 200°F (93°C). The mounting sur-
face and piping to the flowmeter should be free from excessive
vibration. If pulsing flow or vibration causes excessive pointer oscil-
lation, contact the factory for ways to provide additional dampen-
ing.
Because the device operates through a magnetic coupling system,
magnetic material located near the brass flow block can affect
accuracy. To minimize the effect of outside interference, keep mag-
netic materials at least 3 inches (7.6 cm) away from unit.
Inlet Piping
It is a good practice to approach the flowmeter with as few
elbows, restrictions and size changes as possible. Inlet piping
should be as close to the flowmeter connection size as possible to
avoid turbulence which can occur with drastic size changes. The
length of inlet piping has little effect on normal pressure fed
flowmeters.
For vacuum service the inlet piping should be as short and open
as possible to allow operation at or near atmospheric pressure,
thus maintaining the accuracy of the device. Note that for vacuum
service, any flow control valve must be installed on the discharge
side of the flowmeter.
Outlet Piping
Piping to the outlet should be at least as large as the inlet con-
nection. For pressure fed flowmeters on air or gas service, the pip-
ing should be as large and short as possible. This is so pressure
within the device will be at or near atmospheric for maximum
accuracy. This is less important on water or liquid flowmeters since
the flowing media is generally not compressible and therefore back
pressure will not affect the calibration of the instrument.
Series RMV II Rate-Master
®
Flowmeter
Specifications - Installation and Operating Instructions
Bulletin F-59
SPECIFICATIONS
Service: Compatible gases & liquids & oils.
Wetted Materials: Brass, 302 SS, sintered barium ferrite,
polyacetyl.
Temperature Limit: 200°F (93°C).
Pressure Limit: 3000 psig (206 bar).
Pressure Drop: 0-5 GPM: 3.2 PSID; 0-10 GPM: 5.3
PSID; 0-20 GPM: 10.4 PSID.
Accuracy: ±5% of full scale.
Size: Diameter dial face 4.5˝ (114.3 mm)
Process Connections: 3/4˝ female NPT.
Weight: 2 lb, 14 oz (1.3 kg).
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, IN 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyer-inst.com
5-7/8 DIA.
[149.2]
120˚
TYP.
(3) 7/32 DIA. (5.556)
HOLES ON 5-3/8 DIA.
(136.5) BOLT CIRCLE
4.440
[112.8]
3/4⬙ NPT
1.250
[31.75]
1.0
[25.4]
.350
[8.890]
4.645
[118.0]
1.300
[33.02]
*FITS IN ANSI STANDARD 4.940 [125.5] PANEL CUTOUT.
F-59:F-59 8/19/09 8:30 AM Page 1
(106 Seiten)
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