Flow-Tech Industries variable area meters are a simple rotometer-type device designed to give reliable and economical flow measurement with full-scale accuracy. It is a long-time industry standard for a wide range of liquids and gases, ideal for applications requiring visual flow measurement, including liquid measurement for leak detection, reverse osmosis and ground water remediation. Our advanced line of variable meters also provide for gas measurement, blanketing systems, air drying equipment, gas purge and nitrogen generators. All meters can be provided with or without purge valves and/or alarms.

Our rotameter and variable area flow meters feature:

  • 1/8 inch to 2 inch in line sizes
  • Flow rates from 0.6 GPH on liquids, 2.2 SCFM on air
  • Pressures to 4,000 PSIG without valve, 1500 PSIG with valve
  • Fittings and Valve Materials: Stainless Steel, Bronze, PVC, and Teflon®
  • Tube Materials: Acrylic, Polysulfone, and Borosilicate Glass

Rotameter Flow Meter Brands Available

King Instruments Flow Meters

King Instruments Flow Meters Houston, TX

King Rotameter Houston, TX

Flow Meter Features:

  • Versatile removable glass tube
  • Materials: 316L SS, Hastelloy, Teflon, Borosillicate Glass, Polysulfone, PVDF, Acrylic
  • Direct reading scales
  • Liquids and gas
  • To 450 GPM – water
  • To 350 SCFM – air
  • Purge valve
  • Various connection sizes and orientations

Variable Area Flow Meters


Hedland Flow Meters Houston, TX

Basic In-line Flow Meters
Hedland offers a complete line of over 15,000 variable area flow meters to measure oil, phosphate esters, water and water-based fluids, as well as air and other compressed gases. In addition to the basic in-line model, these variable area flow meters are available in high temperature models and test kits with pressure gauge.

  • Rugged, durable construction featuring aluminum, brass and stainless steel bodies
  • Most models available in sizes from 1/4" to 3"
  • Accuracy of ±2% of full scale
  • Temperatures to 240 °F (116 °C); 400 °F (204 °C) for high temperature models
  • Pressures up to 6000 psi (414 bar)
  • Operates in any position
  • No flow straighteners or special piping required
  • 360° rotatable scales
  • Custom scales available

For more information about rotameter flow meters, call our main number at 281.479.9700. You can also contact a Flow-Tech sales representative via email at [email protected].

Corporate Headquarters
1515 W. 13th Street
Deer Park, TX 77536


E-mail:[email protected]
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