


Dwyer Instruments VFA-25 | Flowmeter | Range 3-25 LPM air
A range of transparent acrylic body flowmeters with a clear acrylic body and precise machining that are ideal for gas and liquid applications is represented by the Model VFA-25 Visi-Float® Flowmeters. Visi-Float® flowmeters are manufactured with over 60 years of acrylic instrument machining knowledge. The 2" (51 mm) and 4" (102 mm) scales in this series come with optional precision metering valves.

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- Specifications
- Features
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Accuracy | 5% of FS |
Approvals | Meets the technical requirements of EU Directive 2011/65/EU (RoHS II) |
Connection | Process: 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 |
Length | Scale: VFA 2" typical length VFB 4" typical length |
Manufacturer | Dwyer Instruments |
Material | Wetted: 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 |
Mounting | Mount in vertical position |
Range | 3-25 LPM air |
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) |
Type | Visi-Float® Flowmeters |
Weight | 4.0 to 4.8 oz (.11 to .14 kg) |
- Attractive design with bodies that are cut and precisely machined from transparent, solid acrylic blocks permits full visual examination.
- Improved reading accuracy because to the float's distinct appearance against a smooth white background.
- With direct reading scales that are hot stamped into the plastic, there is no need for difficult conversions, and the product's operational life is extended.
- High repeatability due to tapered bores that are precisely machined.
- Reasonably priced installation with choices for back or end connections and metal mounting inserts that may be directly supported by system pipes.
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