Dwyer DR Direct Read Variable Area Glass Flow Meters
Dwyer DR Direct Read Variable Area Glass Flow Meters

Dwyer DR Direct Read Variable Area Glass Flow Meters

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Dwyer DR Direct Read Variable Area Glass Flow Meters are ideal for the direct flow measurement of air, water, and other commonly used gases. These flow meters are designed with direct read scales with no need for correlation charts. They feature borosilicate glass tubes in 150 mm or 65 mm scales with aluminum and SS metering valve options. Flow meters are shipped completely assembled and include standard panel mounting hardware for quick installation.

Tapered bore in-line indicators for flow rate. Ideal for high purity or corrosive liquid applications, gas and liquid applications, air samplers and medical applications. Flow meters are shipped assembled and ready for panel mounting.

Dwyer DR Direct Read Variable Area Features

  • Permanently fused ceramic scale with vertical locator line, reflective lens background and 1.5 X magnification lens 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
  • Optional needle valve for flow rate control eliminating the need for a separate valve reducing cost
  • Increased protection with included safety blow-out back panel for added safety


  • Film processing
  • Paper manufacturing
  • Chemical processing
  • Semiconductor industry
  • Water and air pollution analysis equipment
  • Metals processing
  • Industrial fuel and energy conservation
  • Cylinder gas metering
  • General laboratory and industrial applications
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Dwyer DR Direct Read Variable Area Specification

Service Compatible gases or liquids.
Wetted Materials Flowtube: Borosilicate glass; Float: 316 SS (black glass as indicated); Float stops: PTFE; End fittings: Anodized aluminum or 316 SS; O-rings: Buna-N on aluminum models and fluoroelastomer on SS models.
Temperature Limits 250°F (121°C).
Pressure Limits 250 psig (17 bar).
Accuracy ±5% FS @ 70°F (21.1°C) and 14.7 psia (1 atm absolute).
Repeatability ±0.25% of scale reading.
Scales Direct reading 65 mm or 150 mm scales for air or water.
Turn-down ratio 10:01
Connection 1/8″ female NPT.
Mounting Vertical.
Valve 6-turn needle (standard on models with valve).

Download Data Sheet: Series DR Direct Reading Glass Flow Meters

Ref: dwyer-inst.com

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