Omega VF User guide

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SERIES VF | VISI-FLOAT® ACRYLIC FLOWMETER

FEATURES/BENEFITS

• Bodies are cut and precision machined from solid, clear acrylic blocks allowing for complete visual inspection

•Whitebackgroundallowsforbettervisibilityoftheoatincreasingreadingaccuracy

• Direct reading scales are hot stamped into the plastic eliminating the need for troublesome conversions and increasing

product operating life

• Precision machined tapered bore enables high repeatability

• Low installation costs with back or end connection options with metal mounting inserts that can be supported directly by

system piping

DESCRIPTIONAPPLICATIONS

• Medical equipment

• Laboratory equipment

• Air samplers

• Gas analyzers

• Pollution monitors

• Chemical injectors

• Cabinet purging

The Series VF Visi-Float® Acrylic Flowmeter is a line of direct reading,

precision machined, clear acrylic body owmeters suitable for both gas and liquid applications. The fabrication of the Visi-Float® owmeter is backed by over 60 years of experience in acrylic instrument machining. This series consists of 2˝ (51 mm) and 4˝ (102 mm) scales with optional precision metering valves.

SPECIFICATIONS

Service Compatible gases and liquids.

Wetted Materials Body: Acrylic plastic; O-ring: Buna-N (uoroelastomer available); Metal parts: Brass standard, SS optional;

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

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

Temperature and 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).

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 are not available with brass valves.

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

Mounting Connection Mount in vertical position.

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

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DIMENSIONS

FULL OPEN

HOW TO ORDER

Use the bold characters from the chart below to construct a product code.

SERIES

VFA: 2˝ (50.8 mm) scale VFB: 4˝ (101.6 mm) scale

RANGE

VFA

-1: 0.1 to 1 SCFH air

-2: 0.2 to 2 SCFH air

-3: 0.6 to 5 SCFH air

-4: 1 to 10 SCFH air

-5: 2 to 20 SCFH air

-6: 4 to 30 SCFH air

-7: 5 to 50 SCFH air

-8: 10 to 100 SCFH air

-9: 20 to 200 SCFH air

-21: 0.06 to 0.5 LPM air

-22: 0.15 to 1 LPM air

-23: 0.6 to 5 LPM air

-24: 1 to 10 LPM air

-25: 3 to 25 LPM air

-26: 6 to 50 LPM air

-27: 10 to 100 LPM air

-32: 6 to 50 CC/min water

-33: 10 to 100 CC/min water

-34: 20 to 200 CC/min water

-41: 0.6 to 5 GPH water

-42: 2 to 10 GPH water

-43: 3 to 20 GPH water

-44: 8 to 40 GPH water

VFB

-50: 0.3 to 3 SCFH air

-91: 1 to 10 SCFH air

-51: 2 to 20 SCFH air

-52: 4 to 40 SCFH air

-53: 10 to 100 SCFH air

-54: 10 to 150 SCFH air

-55: 20 to 200 SCFH air

-90: 0.3 to 3 SCFM air

-60: 100 to 1000 CC/min air

-65: 0.2 to 4 LPM air

-66: 1 to 10 LPM air

-67: 1 to 20 LPM air

-68: 3 to 30 LPM air

-69: 4 to 40 LPM air

-82: 2 to 30 CC/min water

-80: 0.5 to 12 GPH water

-83: 1 to 20 GPH water

-84: 6 to 40 GPH water

-81: 6 to 60 GPH water

-85: 0.2 to 2 GPM water

-86: 0.6 to 5 GPM water

DIMENSIONS in [mm]

Model VFA Model VFB

A 4 [101.6] 6-1/2 [165.1] B 3 [76.20]

1/8˝ female NPT

C 1-5/8 [41.28]

10-32 thread D 1/2 [12.70] 1/2 [12.70] E 1-3/16 [30.16] 1-1/2 [38.10] F 1-1/4 [31.75] 1-1/4 [31.75] I 2-1/16 [52.39]

(BV or SSV only) K 4-3/32 [104.0] 6-19/32 [169.9]

L 1 [25.40] 1-3/8 [34.93] M 7/8 [22.23] (EC only) 7/8 [22.23] (EC only)

N 3/32 [2.381] (EC only) 3/32 [2.381] (EC only) *VFB ranges 85 and 86 have 1/4” NPT back connections or 3/8” NPT end connections.

VFA -1 -SSV -NIST

5-1/2 [139.7] 1/8˝ female NPT* 3-1/2 [88.90] 10-32 thread

2-1/16 [52.39] (BV or SSV only)

OPTIONS

-ARB: Arbitrary scale

-AT: Aluminum tag

-EC: End connections

-NIST: NIST traceable calibration

certicate

-PF: Adjustable pointer ag

-PTFE: PTFE valve seat

-SPCL: Special cleaning

-SS: Stainless steel wetted parts

-VIT : Fluoroelastomer O-rings

-WL: Without logo

VALV E

BLANK: Standard (no valve)

-BV: Brass valve

-SSV: Stainless steel valve

ACCESSORIES

Model Description RKA RK-RMB

Regulator kit for Series VFA Regulator kit for Series VFB

Regulator Kits

Available as optional extras for the Visi-Float for use where inlet air pressure uctuates widely and constant ow is required. The regulator maintains a constant pressure differential of approximately 3 ±0.15 psig. Supply pressure must be at least 3 psig above the owmeter discharge to operate. The standard regulator may be used up to 200 scfh.

owmeter models. Recommended

ORDER ONLINE TODAY!

dwyer-inst.com/Product/SeriesVF

DWYER INSTRUMENTS, INC.

Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.