Perseus Range - Intrinsically Safe Pressure Switches

  • ATEX/IECEx Intrinsically safe Gas & Dust version;
    II 1G Ex ia IIC T6 ...T2 Ga Tamb - 50 to +78°C...+93°C;
  • II 1D Ex ia IIIC T135°C Da Tamb - 50 to +70°C ot;
  • ATEX/IECEx Intrinsically safe Gas.
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  • ATEX/IECEx Intrinsically safe Gas & Dust version
    II 1G Ex ia IIC T6 ...T2 Ga Tamb - 50 to +78°C...+93°C
  • II 1D Ex ia IIIC T135°C Da Tamb - 50 to +70°C ot
  • ATEX/IECEx Intrinsically safe Gas
  • II 1G Ex ia IIC T5...T2 Ga Tamb -50°C to +72°C...+122°C with resistors
  • 1 x SPDT microswitch or 2 x SPDT microswitches for DPDT switching or adjustable deadband or dual independant switching
  • Internal adjustment scale
  • 316 Stainless steel or black anodised aluminium switchcase to IP66 and IP67 standards
  • Proven and documented SIL 2 IEC 61508 suitability.

Types of switches:

The Perseus pressure, vacuum, differential pressure, temperature, and level switches are designed for use in environments where explosive gases and dust can be present (e.g. Gas fields, Oil rigs and Chemical plants etc.) and have been ATEX and IECEx certified as detailed overleaf (SIL2 - IEC 61508 proven reliability). These switches are manufactured from a high quality casting which offers robust construction and protection to IP66 & IP67 for use within heavily polluted industrial environments. A special feature of the instruments is the separation of the flameproof and adjustment compartments allowing for safe on-site adjustment of the set point with power on and the switch in operation.

Perseus Exd switches must be installed in accordance with BS EN 60079-14.


The design features a simple form of adjustment against a calibrated scale. This enables a user to order switches set at a predetermined point or stock a mid range setting and adjust switches to suit the particular application. The set point can be safely adjusted with the switch electrically live. Adjustment is made by removing the access cover and rotating the set point adjuster using a suitable tommy bar or allen key. The setting is read from the centre of the set point adjuster against the scale. Rotation to the left will increase the set point and to the right decrease it.


Industrial Technical Services from Mississauga, Ontario is a single source Instrumentation and Automation company. We provide certified calibrations, PLC programming, custom controls and Panels.

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