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Flow switch


The AC and DC powered Hedland Flow-Alert Flow Switch modules consist of a latching relay circuit housed in a sealed polypropylene enclosure.

The modules have a normally open dry relay contact that can be used to directly control alarms, warning lights, relays or be used to interface to a PLC. The relay will be latched on as the magnet inside the flow meter passes by the module, and remain latched on until the magnet passes in the other direction or power is interrupted.The set point is adjustable from 0 to 100% of full scale.

The Reed Switch Flow-Alert modules are housed in a sealed polypropylene enclosure. The reed switch module does not provide the latching function like the AC and DC powered units. When the magnet inside the flow meter comes within proximity of the module, the reed switch will change state.

The set point is adjustable from 0 to 100% full scale. Two reed switches providing low flow and high flow set points may be installed on a single flow meter.

Technical Specs

Model Flow-Alert Flow Switch
Measured Media Water, oil, air, compressed gasses
Temperature range 0 °C to 121 °C
Accuracy ±5% of full scale
Material Body:
  • Polysulfone

    Wetted parts:
  • Piston: Polysulfone
  • Cone: Polysulfone
  • Spring: T300 Stainless Steel
  • Retaining Rings: PH15-7MO Stainless Steel
  • Seals: Buna-N
  • Indicator Ring: Buna-N
  • Limit Indicators: Polypropylene
  • Magnet: Strontium Ferrite (switching units only)
  • Fittings: C360 Brass, PVC, T303 Stainless Steel

    Connection:
  • T303 Stainless Steel, PVC, brass, polysulfone
  • Flow Range Oil & water:
    2 - 15 LPM (0.5 - 4.0 GPM) up to
    40 - 380 LPM (10 - 100 GPM)
    Air & gases:
    5 - 20 L/SEC (10 - 45 SCFM) up to
    75 - 475 L/SEC (140 - 1000 SCFM)
    Connection Size Available in 1/2 to 2 inch ports
    Pressure 325 psi (22 bar) maximum for oil & water
    125 psi (8.6 bar) maximum for air & gases
    Switch options MICRO SWITCH - Single(1) or Double(2) prewired single-pole, double-throw (SPDT)
    REED SWITCH - Single(1) or Double(2) prewired single-pole, single-throw (SPST-NO) normally open or single-pole, single-throw (SPST-NC) normally closed
    Connection MICRO SWITCH - Pig-tail conductor (standard) with water-tight strain relief
    REED SWITCH - 4 pin


    Available models:

    1/2" NPTF female, swivel
    brass fitting
    H624-704
    H624-707
    H624-710
    H624-716

    H624-604
    H624-607
    H624-610
    H624-616

    H624-504
    H624-507
    H624-510
    H624-516


    1/2" NPTF female, swivel
    303 SS fitting
    H626-704
    H626-707
    H626-710
    H626-716

    H626-604
    H626-607
    H626-610
    H626-616

    H626-504
    H626-507
    H626-510
    H626-516


    1/2" BSPT female, swivel
    brass fitting
    H627-704
    H627-707
    H627-710
    H627-716

    H627-604
    H627-607
    H627-610
    H627-616

    H627-504
    H627-507
    H627-510
    H627-516


    3/4" NPTF male, swivel
    brass fitting
    H625-704
    H625-707
    H625-710
    H625-716
    H625-718
    H625-728
    H625-604
    H625-607
    H625-610
    H625-616
    H625-618
    H625-628
    H625-504
    H625-507
    H625-510
    H625-516
    H625-518
    H625-528


    3/4" BSPT male, swivel
    brass fitting
    H630-704
    H630-707
    H630-710
    H630-716
    H630-718
    H630-728
    H630-604
    H630-607
    H630-610
    H630-616
    H630-618
    H630-628
    H630-504
    H630-507
    H630-510
    H630-516
    H630-518
    H630-528


    3/4 or 1 inch nominal, swivel sweat
    brass fitting
    H620-604
    H620-607
    H620-610
    H620-616
    H620-618
    H620-628


    1" NPTF male, plastic
    polysulfon fitting
    H621-704
    H621-707
    H621-710
    H621-716
    H621-718
    H621-728
    H621-604
    H621-607
    H621-610
    H621-616
    H621-618
    H621-628
    H621-504
    H621-507
    H621-510
    H621-516
    H621-518
    H621-528


    1" nominal socket weld
    PVC fitting
    H628-704
    H628-707
    H628-710
    H628-716
    H628-718
    H628-728
    H628-604
    H628-607
    H628-610
    H628-616
    H628-618
    H628-628


    1" NPTF male, swivel
    PVC fitting
    H629-704
    H629-707
    H629-710
    H629-716
    H629-718
    H629-728
    H629-604
    H629-607
    H629-610
    H629-616
    H629-618
    H629-628
    H629-504
    H629-507
    H629-510
    H629-516
    H629-518
    H629-528


    Switch
    H526-004
    H526-006
    H526-008-NO
    H526-008-NC
    H526-008

    Data sheet

    Catalogue



    See also
    Flow switch
    The AC and DC powered Hedland Flow-Alert Flow Switch modules consist of a latching relay circuit housed in a sealed polypropylene enclosure.

    The modules have a normally open dry relay cont.....
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    Liquid Flow Switch
    RCM general purpose Flo-Gard II flow switches (liquid) reed switches make or break contacts by detecting the position of a magnet permanently attached to the bellow. Our reed switches can also be or.....


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