Delta Mobrey 306 Series Differential Pressure Switch


Delta Mobrey 306 Series Differential Pressure Switch is suitable for setpoints between -12.5mbar and 4bar with maximum working pressures up to 15bar. Designed in the mid-1970s and developed over subsequent years, the Performance Series switch range offers users the broadest range of options, the highest levels of set-point repeatability and the confidence of long term performance that a mature product such as this can prove.

The model 306 Performance Series differential pressure switches utilise a nitrile diaphragm based sensor. This, when coupled with a precision stainless steel mechanism designed to minimise friction in the moving parts, helps deliver the market leading performance customers have come to expect from the series.

  • Ranges available up to 4 Bar (60 psi)
  • Weatherproof IP66 enclosures in zinc alloy or stainless steel
  • ATEX and IECEx Ex d Flameproof models available
  • Environmentally and Hermetically sealed switch options
  • Set-point adjustable over the full range against a calibrated scale with tamperproof adjuster

Delta Mobrey 306 Series Advantages:

  • Better than 1% set-point repeatability
    • Users can expect a set-point repeatability performance better than 1% on all configurations with some configurations being significantly better
  • Extensive range of options
    • The Performance Series switches are available with an extensive range of materials, process connections, switch types, electrical entries, etc and offer customers many millions of different possible configurations.
  • More than 35 years experience in the field
    • Installed in a wide range of applications from nuclear power plants to offshore oil rigs, the Performance Series’ long experience in the field offers customers the reassurance that they can be relied upon to survive the test of time in the harshest environments.
  • Safety
    • All Performance Series models come with a safety vent to prevent the enclosure becoming pressurized in the event that the sensor is inadvertently damaged by excessive pressure


  • Precision stainless steel mechanism for arduous atmospheres and high humidity.
  • Safety vented or blow out device as standard.
  • Hermetically sealed microswitch option.
  • Models for fixed switching differential, adjustable differential and HI-LO operation.
  • Ranges available up to 4 bar (60 psi). Static pressure up to 15 bar (200psi).


The 306 Performance Series is suitable for a wide range of applications in:

  • Oil & Gas
  • Chemical
  • Petrochemical
  • Refining
  • Power
  • Food Industry

The choice of models available ensures that the 306 Performance Series is suitable for use in:

  • Corrosive atmospheres
  • Resistant to chemical attack

Delta Mobrey 306 Series Specification:

  • Accuracy:
    • Set point repeatability ± 1% of span at 20°C / 68°F ambient.
    • Scale accuracy ±3% of full scale
  • Storage Temperature: -25 to +60°C / -13 to +140°F
  • Ambient Temperature:
    • -25 to +60°C / -13 to +140°F
    • Special build is also available for temperature down to -60°C (-76°F)
  • Maximum Process Temperature: Subject to appropriate installation practice, the component parts will withstand up to +60°C (+140°F). For higher temperatures, refer to models 301 and S31
  • Enclosure classification: IP66 / NEMA 4X / Flameproof Ex d
  • Switch output:
    • SPDT or DPDT snap action microswitch (standard)
    • Hermetically sealed (optional)
  • Process Connection: Rc 1/4 (BSP) Others (optional)
  • Approximate weight: 1.7kg / 3.7lb to 3.74kg / 8.1lb depending on model

Download Data Sheet: Differential Pressure Switch 306 Series


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