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The Visi-Float

Series Flowmeters are furnished in two models (see

Figure 1) each available in a broad choice of flow ranges with direct

reading scales for air, gas or water. 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 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 Visi-Float

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 flowmeter to the factory. It will

be checked for conformance at no charge. Before proceeding with the

installation of your Visi-Float

Flowmeter, check to be sure you have the

model and flow range you require.

LOCATION

Temperature, Pressure, Atmosphere, and Vibration:

Visi-Float

Acrylic Flowmeters are exceptionally tough and strong. They

are designed for use at pressures up to 100 psi (7 bar) and

temperatures up to 150°F (66°C). DO 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 panel should be free of excessive vibration 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 i.e.

˝ Iron

Pipe Size. Length of inlet piping makes little difference for normal

pressure fed flowmeters.

For flow meters on vacuum air service the inlet piping should be as short

and open as possible. This will allow operation near atmospheric

pressure and thereby insure the accuracy of the device. (Note that for

vacuum air service the flow control valve if any, should be on the

discharge side of the flowmeter. Either the TMV unit or a separate in line

valve may be applied.)

Discharge Piping: As on the inlet, discharge piping should be at least

as large as the flowmeter connection. In addition, for pressure fed

flowmeters on air or gas service the discharge piping should be as short

and open as possible. This will allow operation of the flow tube at near

atmospheric pressure and insure the accuracy of the device. This is of

less importance on water or liquid flowmeters since the flowing medium

is generally incompressible and moderate back pressure will not affect

the accuracy of the instrument as calibrated.

Series VF Visi-Float

Flowmeter

Specifications - Installation and Operating Instructions

Bulletin F-33

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

I

FULL OPEN

SPECIFICATIONS

Service: Compatible gases & liquids.

Wetted Materials:

Body: Acrylic plastic.

O-ring: Buna-N (Fluoroelastomer available).

Metal Parts: Brass standard, SS optional.

Float: SS, black glass, aluminum, K Monel depending on range.

Temperature & Pressure Limits:

Without Valve: 100 psig (6.9 bar) @ 150°F (65°C);

150 psig (10 bar) @ 100°F (38°C).

With Valve: 100 psig (6.9 bar) @ 120°F (48°C).

Accuracy: VFA = 5% FS; VFB= 3% FS.

Process Connection: 1/8˝ female NPT. VFB ranges 85 and 86 have

1/4˝ NPT back connections or 3/8˝ NPT end connections. These ranges

not available with brass valves.

Scale Length: VFA 2˝ typical length; VFB 4˝ typical length.

Mounting Orientation: Mount in vertical position.

Weight: VFA: 4.0-4.8 oz (.11-.14 kg). VFB: 7.2-8.8 oz (.20-.25 kg).

POSITION AND MOUNTING

All Visi-Float

Flowmeters must be mounted in a vertical position with the

inlet connection at the bottom and outlet at the top.

Surface Mounting: Drill appropriate holes in panel using the dimensions

shown in Figure 1. Hold the flowmeter in position in front of the panel and

install the mounting screws through the panel from the rear. Mounting

screws must not be longer than the panel thickness plus 1/4˝, or the

screw will hit the plastic and may damage the meter. The screws will

require additional force during the initial installation, since the insert

boots are of a collapsed thread type and must be expanded into the

plastic for the knurled surface to take hold. Insert boots will not have the

proper 10-32 threads until the first screw has been inserted to expand

IMENSION-IN INCHES

Model VFA

3 (1/8 female NPT)

1-5/8 (10-32 Thread)

1/2

1-3/16

1-1/4

2-1/16 (BV or SSV)

4-3/32

3/4 (EC)

3/32 (EC)

Model VFB

6-1/2

5-1/2 (1/8female NPT)*

3-1/2 (10-32 thread)

1/2

1-1/2

1-1/4

2-1/16 (BV or SSV)

6-19/32

1-3/8

3/4 (EC)

3/32 (EC)

*VFB ranges 85 and 86 have 1/4˝ NPT back connections or 3/8˝ NPT end connections.

Fig. 1

Model VFB Model VFA-SSV

1 2

DWYER INSTRUMENTS, INC 1

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Seite 1 - DWYER INSTRUMENTS, INC

The Visi-Float® Series Flowmeters are furnished in two models (seeFigure 1) each available in a broad choice of flow ranges with directrea

Seite 2

the boot. Pipe up inlet and discharge using pipe thread sealant tape orpipe thread sealant to insure against leakage.Surface Mounting on Piping On

Verwandte Modelle: VFA

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Dwyer VFB Bedienungsanleitung

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