Dwyer HFO In-Line Flow Alarms
Dwyer HFO In-Line Flow Alarms

Dwyer HFO In-Line Flow Alarms

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Dwyer HFO In-Line Flow Alarms provide continuous monitoring and control of flow rate levels. The flow alarm can be configured to open or close contact for an increasing or decreasing set point. Available in 1/4″, 1/2″, 1″ or 1-1/2″ female NPT process connections, in aluminum, brass or 304 SS body.

Flow includes Flow Transmitters, Flow Sensors, Flow meters, Sight Flow Indicators and Water Meters. Mass Flowmeters, Controllers, Flow Indicators and Controllers are ideal for the measurement of flow rates.

Flow Switches come as a paddle, thermal, piezo, and shuttle/piston. Flow meters indicate flow rate. The different sensors include dial, in-line, ultrasonic, orifice plate, totalizing meters, variable area, venturi, or switch output. The different designs of the flow meters have a variety of applications.

Flow indicators with an electrical contact output at a specific flow rate with switch output. Applications include chemical processing, wastewater processing, lubrication systems, drain lines, process control, and pump testing.

Dwyer HFO In-Line Flow Alarms Features

  • Provides two 10 A SPDT limit switches with field adjustable alarm settings for application control and integral direct reading scale provides local indication of flow rate
  • Increased application versatility with no inlet or outlet straight plumbing requirement and can be mounted horizontally, vertically, or inverted
  • Outdoor or harsh environment installation capable with rugged cast aluminum construction and NEMA 4X (IP65) enclosure


  • Waste water processing
  • Lubrication systems
  • Process control
  • Solar systems
  • Drain lines
  • Pump testing
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Dwyer HFO In-Line Flow Alarms Specification

Service Compatible gases or liquids.
Wetted Materials Body: Aluminum, brass or 304 SS; Seals: Buna-N or fluoroelastomer; Magnet: PTFE coated Alnico; Other internal parts: 304 SS.
Viscosity 500 SSU.
Temperature Limits 170°F (76°C).
Pressure Limits Aluminum Body: 600 psig (41 bar); Brass body: 3500 psig (240 bar); 304 SS body: 6000 psig (413 bar).
Enclosure Rating NEMA 4X (IP66).
Accuracy Measuring ±4% FS over entire range; ±2.5% over center third of the measuring range.
Repeatability ±1% of full scale.
Switch Type SPDT, 10A @ 250 VAC; 0.5A @ 125 VDC (resistive).
Shipping Weight 1/4 to 1/2″ female NPT models: 3 lb (1.4 kg); 3/4 to 1″ female NPT models: 4.5 lb (2.0 kg); 1-1/2″ female NPT models: 12 lb (5.4 kg).

Ref: dwyer-inst.com

Download Data Sheet: Series HFO In-Line Flow Alarms

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