131 Flow Switches Delta Mobrey

The model 131 Flow Switch is suitable for setpoints between 2.5 m/s and 12.5 m/s, with a max flow rate up to 17.5 m/s.

Vane Operated Flow Switch is designed to provide protection and control in ducted air systems in flammable atmospheres. Its main application is to detect air flow in HVAC systems located in harsh environments and/or hazardous area. The sensing element is a freely pivoted, counter-weighted vane which at its rest position lies at right angles to the direction of flow. The action of the flow is to pivot the vane and operate a microswitch via a dustproof seal.


The unit is manufactured, checked and supplied in accordance with our published specification, and when installed and used in normal or prescribed applications, with the lid in place and within the parameters set for mechanical and electrical performance, will not cause danger or hazard to life or limb.


The 131 is suitable for a wide range of applications in many Industry sectors:

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


  1. Better than 1% set-point repeatibility

    Users can expect a set-point repeatability performance better than 1% on all configurations with some configurations being significantly better

  2. 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.

  3. 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.

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Enclosure: IP66 Protection

Wetted parts: Mild steel backplate – aluminium or stainless steel vane.

Process connection: Duct mounting.

Unit weight: 

  • 4.6kg – 9.4kg /10.2lb – 20.7lb
  • Air Flow.
  • 2.5 to 12.5 m/sec.
  • (500 to 2500 ft/min).
  • ATEX and IECEx.

Download Data Sheet: 131 flow switches

Ref: delta-mobrey.com