Dwyer VA Variable Area Glass Flow Meters

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Dwyer VA Variable Area Glass Flow Meters are designed with easy to read universal mm scale and supplied with correlation charts containing calibration data for air and water. Glass flow meters are suitable for metering carrier gases, liquid and gas measurement in pilot plants, laboratories, process flow and level indicating. Units are equipped with a standard 6-turn needle valve for flow rate control.

High precision metering valves with non-rising stems (sold separately) are available for high sensitivity control and resolution - particularly suited for very low flow rates. Flow meters are shipped completely assembled and ready for panel mounting. Use an optional acrylic tripod base to convert to self-standing bench mounting.

Dwyer VA Variable Area Features

Permanently fused ceramic scale with vertical locator line reduces parallax and eye fatigue saving time
Long operating life with thick polycarbonate front shield that protects tube from breakage and serves as a magnifying lens to enhance reading resolution
Standard 6-turn needle valve for flow rate control eliminating the need for a separate valve reducing cost
No additional installation required with optional acrylic tripod base which allows for self-standing bench mounting
High precision metering valves with non-rising stems are available for high sensitivity control and resolution for very low flow rate

Application

Gas or liquid metering
Chemical processing
Semiconductor systems
Water and air pollution analysis systems
Laboratory systems

Dwyer VA Variable Area Specification

Service	Compatible gases or liquids.
Wetted Materials	Flow tube: Borosilicate glass; Floats: Glass or SS (sapphire, Carboloy and tantalum are optional); Float stops: PTFE; End fittings: Anodized aluminum, 316 SS, brass or PTFE; Packings: Fluoroelastomer, none on VAX5XX models; O-rings: Buna-N on aluminum models and brass models, fluoroelastomer on SS models, PTFE on VAX5XX models.
Temperature Limits	250°F (121°C); VAX5XX: -15 to 150°F (-26 to 65°C).
Pressure Limits	200 psig (13.8 bar); VAX5XX: 100 psig (6.7 bar).
Accuracy	±2% FS @ 70°F (21.1°C) and 14.7 psia (1 atm absolute); VA1043, VA1243, VA1343, VA25425, VA25025: ±5% FS @ 70°F (21.1°C) and 14.7 psia (1 @ absolute).
Repeatability	±0.25% FS.
Scales	Universal 65 mm or 150 mm with correlation charts.
Turn-Down Ratio	10:01
Connections	Two 1/8" female NPT.
Mounting	Vertical.
Valve	6-turn needle (standard), optional 16-turn high precision valve.
Valve Orifice	Acetal on aluminum models and brass models, PCTFE on stainless steel models; PTFE on VAX5XX models.