DWYER Series DTFA Variable-Area Flowmeter for Gases

RM 0.00



Series DTFA Variable-Area Flowmeter for Gases

Economical, Aluminum Body, 5% FS Accuracy

The Series DTFA Variable-Area Flowmeter 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.

Product Applications

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



  • 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



  • 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).


Models & Ordering

1/4″ connections

Model Description
DTFA-1A-10A Range 1.5-10 SCFM, 1/4″ npt connection
DTFA-1A-15A Range 2.0-15 SCFM, 1/4″ npt connection
DTFA-1A-20A Range 3.0-20 SCFM, 1/4″ npt connection
DTFA-1A-25A Range 3.0-25 SCFM, 1/4″ npt connection


1/2″ connections

Model Description
DTFA-2A-100A Range 10.0-100 SCFM, 1/2″ npt connection
DTFA-2A-30A Range 3.0-30 SCFM, 1/2″ npt connection
DTFA-2A-40A Range 4.0-40 SCFM, 1/2″ npt connection
DTFA-2A-50A Range 4.0-50 SCFM, 1/2″ npt connection
DTFA-2A-75A Range 5.0-75 SCFM, 1/2″ npt connection




Additional information


DTFA-1A-10A, DTFA-1A-15A, DTFA-1A-20A, DTFA-1A-25A, DTFA-2A-100A, DTFA-2A-30A, DTFA-2A-40A, DTFA-2A-50A, DTFA-2A-75A