Dwyer DTFA Series Dial Variable-Area Flow Meter for Gases measures gas flow rates with ±5% of full-scale accuracy at an affordable price. Rugged aluminum construction ensures great compatibility and the strength to withstand system pressures of up to 3000 psig (200 bar). Available in either 1/4″ or 1/2″ NPT connections. Comes pre-calibrated for horizontal in-line mounting.

Dwyer offers different types of Dial Flowmeters for various applications. Flow meters measure water, oil, gas, or air flow rates. Applications include calculating required fill or drain times for tanks, water towers, backflow prevention, heat exchangers, and oil & gas equipment.

Dwyer DTFA Series Features

  • Durable metal construction ensures great reliability and the strength to withstand system pressures of up to 3000 psig (200 bar)
  • Shatter proof construction, unlike glass tube variable area flowmeters, yields long operation life
  • Preform precisely in high temperature, high vibration, shock-prone environments


  • Monitoring pressure drop across filters or strainers
  • Flow scale based on differential pressure
  • Liquid level is given pressure differential between bottom and top of the tank
  • Hydraulic equipment
  • Oil & gas equipment
  • Heat exchangers
  • Backflow prevention
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Dwyer DTFA Series Specification

Service DTFW: Compatible liquids; DTFA: Compatible gases.
Wetted Materials Body: 316 SS, brass or aluminum; Spring: 302 SS or PTFEcoated; Range spring: 302 SS; Magnet: PTFE-coated; Metering cone: Acetal or PTFE; Seals: Buna.
Temperature Limits -40 to 200°F (-40 to 93°C).
Pressure Limit DTFW-3S: 1500 psig (100 bar); All other DTFW models: 3000 psig (200 bar); DTFA: 3000 psig (200 bar).
Accuracy Liquid/oil calibration: ±2% FS; Air calibration: ±5% FS.
Repeatability ±1% FS.
Size Diameter dial face 2.5″ (63.5 mm).
Process Connection See model chart on catalog page.
Weight DTFW-1B and 1S: 3 lb (1.36 kg); DTFW-2B and 2S: 5 lb (2.27 kg); DTFW- 3S: 10 lb (4.54 kg); DTFA-1A: 3 lb (1.36 kg); DTFA-2A: 5 lb (2.27 kg).

Download Data Sheet: Dwyer Series DTFA Dial Variable-Area Flow Meter for Gases

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