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Dwyer Photohelic A3000 Switchgauge

Dwyer Photohelic A3000 differential pressure switchgauges combine the functions of a precise,  stable and repeatable differential pressure switch with an easy-to-read analog differential pressure gauge. Based on the time-proven Magnehelic differential gauge technology, the Dwyer Photohelic A3000 series offers a non contact, stable measurement. Additionally, Fluidic stock several ranges and are able to offer calibration services.


Photohelic A3000 switch setting is easy to adjust with external knobs on the gauge face. Alternatively, to prevent unwanted switch adjustment, the Dwyer Photohelic A3000 switchgauge can be offered with tamperproof knobs (supplied with universal key).  In the event of power failure etc, the Photohelic A3000 differential pressure gauge is unaffected by switch failure.


A plastic housing protects all the electronic components in the A3000. Solid state and integrated circuit electonics are on glass-epoxy printed circuit boards and self-extinguishing terminal boards. Dwyer Photohelic A3000 switchgauges can be wired for high-latching, low latching or a combination of both.


Dwyer Photohelic A3000 specs & benefits…

  •  Non-contact Magnehelic technology DP gauge
  • 2x DPDT form C relays for high and low pressure switching
  • Easy to read 4″ dial face with simple to set switch points
  • Form C Relays have latching feature for maximum application versatility
  • Gauge unaffected by failure of switch, loss of electrical power etc
  • Switch repeatability with 1%, gauge uncertainty to within 2%fs (range dependent)
  • Fluidic calibration and gauge rescaling services available


Fluidic are a recognised partner of Dwyer Instruments for Scotland and the North of England.  Our instrumentation engineers are product trained and are able to help with instrument selection within the full Dwyer Instrument supply scope.  Fluidic have supplied the Photohelic® DP switchgauge for more than twenty years. We offer multiple “Photohelic Solution” services and can supply calibration certification where desired.   Please call either office for more information (Glasgow 0141 641 5920,  Warrington 01925 572401).



  • Download Dwyer Photohelic A3000 Switchgauge Datasheet
  • Download Dwyer Photohelic A3000 Switchgauge User Manual
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