Dwyer Series VF Visi-Float® Variable Area Flowmeter

The Dwyer Series VF Visi-Float® Variable Area Flowmeters are a line of direct reading, precision machined, clear acrylic body flowmeters suitable for both gas and liquid applications. The fabrication of the Visi-Float® flowmeters 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.

Product Applications

  • Medical equipment
  • Laboratory equipment
  • Air samplers
  • Gas analyzers
  • Pollution monitors
  • Chemical injectors
  • Cabinet purging
  • Bodies are cut and precision machined from solid, clear acrylic blocks allowing for complete visual inspection
  • White background allows for better visibility of the float 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

Service : Compatible gases and liquids.
Wetted Materials : Body: Acrylic plastic; O-ring: Buna-N (fluoroelastomer available); Metal parts: Nickel plated 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% of FS; VFB = 3% of 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 to 4.8 oz (.11 to .14 kg); VFB: 7.2 to 8.8 oz (.20 to .25 kg).
Agency Approvals : Meets the technical requirements of EU Directive 2011/65/EU (RoHS II).

Datasheet: Dwyer_VF_Datasheet
Catalogue: Dwyer_Series-VF_Catalog
Manuals: Dwyer_VF_Manual

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