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Dwyer Series VFA & VFB Visi-Float® Flow Meter

Visi-Float® Flow Meter
Series VFA & VFB

The Visi–Float® flowmeter bodies are cut and precision machined from solid, clear acrylic plastic blocks. This construction not only produces a handsome finished product, but permits complete visual inspection. As a result, the Visi-Float® flowmeters are especially popular for medical and laboratory equipment applications.

Scales are easy to read — The front scale location and white background provides excellent visibility. The direct reading scales are hot stamped into the plastic and will not wear off. Mid–range calibration is established with a master flowmeter. Accuracy is ±5% of full scale for VFA models, ±3% for VFB. Scales average 2 long on the VFA models, 4 long on VFB.
Durable and attractive construction — The machined acrylic bodies of the Visi–Float® flowmeters are practically unbreakable. Fabrication is backed by over 60 years of experience in acrylic instrument machining. The tapered bore is precision machined to a smooth surface that provides perfect visibility of the indicating float. The VFA and VFB models are available with either brass or stainless steel inlet and outlet connections and are tapped for 1/8˝ NPT thread. VFB models 85 and 86 have either 1/4˝ back or 3/8˝ end connections. All standard models employ Buna–N “O” rings for leak proof operation and are available with either back or end connections for horizontal or vertical piping. Precision metering valves in brass or stainless steel are available for most VFA and VFB models.
Easy installation — All Visi–Float® flowmeters have metal mounting inserts on rear for panel mounting. They can also be supported directly by system piping.
OEM Specials — Special flowmeter designs can be supplied to meet a wide range of requirements and specific applications. These include: on-off plunger and push-to-test valves, special gas or fluid calibration, special ranges, scales, name brand or other identification. Pointer flags can be furnished for instant visual reference. For specific information, please supply an outline of your requirements.

Service Compatible gases & liquids.
Wetted Materials
Body Acrylic plastic
O-ring Buna-N (Viton® available).
Metal Parts Brass standard, stainless steel optional.
Float Stainless steel, 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% of full scale; VFB= 3% of full scale.
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. 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


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