Dwyer Series VFF Instruction Manual

 1-1/4 1-3/8
Г [31.75] i Г [34.93] 7
Direction of Flow —— — >
3-23/64
[85.33]
2-31/64
[63.10]
VISI-FLOATS FLOWSETTER
Model Number Range GPM Water
VFF-1 0.5-2.0
VFF-2 2.0 - 5.0
VFF-3 5.0 - 8.5
Dwyer® Visi-Float® Flowsetter flowmeters are furnished with integral
valves to aid in setting the desired flow rate. The meters can be installed
in any position. Installation, operation and maintenance are very simple
and only a few common sense precautions must be observed to assure
long, trouble-free service.
Calibration
Each Dwyer flowmeter is calibrated at the factory. If at any time during
the meter's life, you wish to recheck its calibration, do so only with
devices of certified accuracy. DO NOT attempt to check the Dwyer
flowmeter with a similar flowmeter as seemingly unimportant variations
in piping and back pressure may cause noticeable differences in the
indicated reading. If in doubt, return your Dwyer flowmeter to the factory.
It will be calibration checked for you for a small fee.
Location
Visi-Float Acrylic flowmeters are exceptionally tough and strong. They
are designed for use at pressures up to 100 psi and temperatures up to
150%. NO NOT EXCEED THESE LIMITS! The installation should not
be exposed to strong chlorine atmospheres or solvents such as
benzene, acetone, carbon tetrachloride, etc. The mounting location
should be free of excessive vibrations since it may prevent the unit from
operating properly.
Inlet Piping Run
It is good practice to approach the flowmeter inlet with as few elbows
and restrictions as possible. In every case the inlet piping should be at
least as large as the connection to the flowmeter.
Discharge Piping
As on the inlet, discharge piping should be at least as large as the
flowmeter connection.
Mounting
The flowmeter is designed to mount directly in line and in any orienta-
tion. When using flexible piping, it is recommended that the flexible
piping be supported to reduce vibration in the system.
Visi-Float® Flowmeter
Installation and Operating Instructions
BULLETIN F-41-VFF
SPECIFICATIONS
MeterBody ............. Acrylic plastic. Metering body
Etmgs: «reza dents 3/8 NPT Nickel plated brass
SONGS Ga calas 302 Stainless Steel
Target & Valve Body ...... Delrin
Valve Gal «vos a m mm eme 304 Stainless Steel
Retaining Ring .......... 302 Stainless Steel
O-Rings ......oserenoo. Buna-N
Seales - ua Heb ca Hot Stamped into acrylic body
Maximum Pressures ...... 100 PSIG (690 kPa) @105° (85°C)
and Temperatures ........ 150 PSIG (1034kPa) @100°F (38°C)
AGOUFGCY xv sms rss esis 10% of Full Scale
CODE - add to end
OPTIONS of model Number
Vito: O-AINgs :=-: NEHMEN EEE EEE -VIT
NBS Traceable Certificate ............. -NBS
of Calibration
Aluminum Tag ... cv viii ieee eas -AT
Available Without Dwyer Logo .......... -WL
SST FINES: 1 v0 «nda inns nomen -SS
Operation
To start system, open the system flow slowly to avoid possible damage.
The flow rate is read at the bottom of the target. Adjust the valve to
achieve the desired flow rate.
Maintenance
The only maintenance normally required is occasional cleaning to assure
reliable operation and good float visibility.
Disassemble
The flowmeter can be disassembled for cleaning by simply disconnect-
ing the piping, and removing the top and bottom fittings. Remove the
washer, spring, and target. Removal of the valve is not recommended
due to difficulty in removing the valve from the flowmeter body.
Cleaning
The flow tube and flowmeter body can best be cleaned with a little pure
soap and water. Use of a bottle brush or other soft brush will aid the
cleaning. Avoid benzene, acetone, carbon tetrachloride, alkaline deter-
gents, caustic soda, liquid soaps (which may contain chlorinated
solvents), etc. and avoid prolonged immersion.
Reassemble
Reinstall the spring, target, washer, and fittings. Make sure to reinstall
the target in the proper orientation. (Chamfered side towards inlet.) A
little stop cock grease or petroleum jelly on the O-Rings will help main-
tain a good seal as well as facilitate assembly. No other special care is
required.
Additional Information
For additional flowmeter application information, conversion curves,
factors and other data covering the entire line of Dwyer Visi-Float
flowmeters, ask for our full line catalog.
Printed in U.S.A. 1/00 443034-00