


Dwyer Instruments VFLO | Venturi Flowmeter with Magnehelic® Gage
The aluminum construction of the Series VFLO Venturi Flowmeter with Magnehelic® Gage and its progressive venturi profile minimize pressure losses through the meter. All it takes to use the flowmeter in either a vertical or horizontal orientation is to rotate the Magnehelic® gage. Your differential pressure reading is shown in a large, readable, and accurate manner by the Magnehelic® gage. Every meter is calibrated under typical air conditions. Both SCFM and w.c. are read on the dual scale. Simple-to-read reference charts for a range of flow situations are included with the meter. It can handle applications using pressure and vacuum and comes in line sizes ranging from 1" to 4".

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- Specifications
- Features
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Accuracy | +/-2.5% FS |
Connection | Process: Female NPT of nominal line size. See Model Chart page |
Housing | Die cast aluminum case and bezel, with acrylic cover. Exterior finish is coated gray to withstand 168 hour salt spray corrosion test |
Manufacturer | Dwyer Instruments |
Material | Wetted: Aluminum, silicone, acrylic, polycarbonate, high carbon steel, low carbon steel, brass, paper, acrylic paint, enamel paint, alkyd coating, nickel plate, zinc plate, helsel FC, 300 series stainless steel, PTFE, Loctite® AV sealant, commercial black rubber, neoprene, samarium cobalt, nickel alloy steel cover, beryllium copper |
Maximum Operating Pressure | -20" Hg to 15 psig (-0.677 bar to 1.034 bar) MP option: 35 psig (2.41 bar). For applications with high cycle rate within gage total pressure rating, next higher rating is recommended |
Maximum operating temperature | 20 to 140°F (-6.67 to 60°C) |
Mounting | Orientation: Diaphragm in vertical position. Consult factory for other position orientations |
Overpressure | Relief plug opens at approximately 25 psig (1.72 kPa) |
Size | 4" (101.6 mm) diameter dial face |
Type | Venturi Flowmeter |
Weight | Gage only: 1 lb 2 oz (510 g), MP & HP 2 lb 2 oz (963 g) Venturi: see Model Chart page |
- Gradual Venturi profile helps to ensure a more accurate measurement to satisfy measurement criteria by reducing pressure losses through the meter.
- The clear, undistorted plastic face of the gauge makes it easy to read from a distance.
- A patented design that reacts quickly to pressure changes means that important circumstances are assessed without delay.
- Long service life and reduced downtime are achieved by combining high-quality components with a robust and durable casing.
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