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HawkSentry HSFS3 Universal Single or Dual Flow Switch

HawkSentry HSFS3 Universal Single or Dual Flow Switch

Compatible with all HawkVFlo Variable Area Flow Meters, HawkSentry 3 flow switch is a great choice for a variety of single or dual alarm applications. HawkSentry 3 provides a high/low or high and low level switch with a dry contact relay output and is DC powered. This alarm system can be added to most HawkVFlo flow devices to provide intelligent process automation as well as safety capabilities. The red LED alert light brings immediate attention to process conditions. Typical applications include process lube oil flow, gas flows, biodiesel fuel manufacturing, chemical processing, biomedical, coolant system, water and wastewater treatment facilities.


  • Process gas flows
  • Biodiesel fuel manufacturing
  • Hydraulic fracturing/shale gas/gas & oil
  • Chemical processing
  • Biomedical
  • Coolant system
  • Water and wastewater treatment facilities

Product: HSFS3

Principle of Operation

HawkSentry 3™ flow switch consists of two main componenets - the HawkVFlo variable area flow meter and the HawkSentry 3™ switch assembly.  HawkSentry 3™ is a single or dual alarm set point. The Hall Effect Sensor is enclosed in a field enclosure rated either NEMA 4X or NEMA 7, depending upon the area classification. The sensor is then mounted over the HawkVFlo flow meters measuring tube. The assembly can be adjusted either up or down depending on high flow switching or low flow switching.  

  • Adds reliable alarm switching to most HawkVFlo flow meter models
  • Warns of undesired flow deviations in process lines such as seal water, coolants, water and waste treatment, lubrication, boiler feed water & anneasling atmospheres
  • Reliable single or dual alarm
  • Non-contacting electronics - electronics never come in contact with the flow media

Single or Dual Relay Option: N.O. or N.C. 10 amp rated Form C
Supply Voltage: 10 _ 31 VDC
Load Current Max: 250 mA
Voltage Drop: <1 V
Protection Class: NEMA 4X or NEMA 7 Cl 1, Div 1 IP66/67

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