Series DS In-Line Flow Sensor

Brand: Dwyer Instruments, LLC

The Series DS In-Line Flow Sensors are two Series of averaging Pitot tubes for compatible gases and liquids that provide accurate and convenient flow rate sensing, for schedule 40 pipe, when purchased with suitable differential pressure gauge with appropriate range.

The Series DS-300 Averaging Flow Sensors are designed to be inserted in the pipeline through a compression fitting and available for pipe sizes from 1 to 10" (2.5 to 25.4 cm).

Accessories include adapters with 1/4" SAE 45° flared ends compatible with hoses supplied with the Model A-471 Portable Capsuhelic® Gauge Kit.

The Series DS-400 Averaging Flow Sensors are designed for insertion lengths up to 24" (61 cm) and include a pair of 1/8" NPT x 1/4" SAE 45° flared adapters which are compatible with hoses used in the Model A-471 Portable Capsuhelic® Gage Kit.

The supplied solid brass mounting adapter has a 3/4" dia. compression fitting to lock in required insertion length and a 3/4" male NPT thread for mounting in a threaded branch connection (not included).
  • Multiple sensing point measurement and built-in averaging capability eliminates the need for "traversing" the flowing stream with single point velocity pressure measurement saving time
  • Extremely reliable, proven technology, Pitot tubes, have been used in flow measurement for years
  • All models include convenient and quick-acting quarter-turn ball valves to isolate the sensor for zeroing with 1/8" female NPT valve assembly process connections.
  • Furnished with instrument shut-off valves on both pressure connections with 1/8" female NPT connections rated at 200 psig (13.7 bar) and 200°F (93.3° C)
  • Where valves are not required, they can be omitted at reduced cost
  • The Series DS-400 Averaging Flow Sensors are quality constructed from extra strong 3/4" dia. stainless steel to resist increased forces encountered at higher flow rates with both air and water
  • Economical flow indication when used with appropriate differential pressure gauge
  • Rugged construction yields, non-clogging, stable design


Bushing Material

  • Brass

Connection Material

  • Steel

Flow Rate

  • 19 to 22,00 scfm (32 to 37,378 m³/hour) - Air
  • 4.8 to 2,000 gpm (22 to 9100 LPM) - Water

Maximum System Pressure

  • psig: 200 (1,379, bar: 13.8)


  • Air
  • Water


  • Bracket Kit

NPT Connection

  • 1/8” NPT Female
  • 3/4” NPT Male
  • 3/8” NPT

O-Ring Material

  • Buna-N

Pipe Size

  • 1” to 24”

Pressure Range

  • Inches WC: 2 to 100

SAE Connection

  • 1/4” SAE Female

Temperature Range

  • 93° C (200° F)

  • Remediation
  • Natural, Flare, Flue, Stack Gas
  • Boiler Feedwater
  • Cooling Water
  • Superheated, Saturated, or Geothermal Steam
  • Combustion or Compressed Air
  • Oil Flow Monitoring
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