PRESSURE SWITCH TYPE 188

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- EARL 241-244-246 Low pressure control switches and meters

Pressure switch type 188

The rugged and hardwearing pressure switches series 188 are used to control pressures in the range 0.1 to 1600 bar.

Operation (bellows operated units)

The pressure acts upon a spring loaded metal bellows. On reaching the adjusted set point, the bellows operates via a push rod the micro switch. In case of the explosionproof model, a permanent magnet fixed to the bellows acts on the explosionproof sealed contact located adjacent to the rising tube. In case of bellows breakage this model switches to the safe side thus staying sealed. The set point is either fixed or adjustable.

Operation (bourdon tube operated units)

The pressure acts upon a bourdon tube and moves its free end having constant reproducibility. Dependent on model the free end operates one or two inductive proximity sensors or metal encapsulated reed contacts. Set point fixed or adjustable.

Die ankommende Strömung trifft auf die Windfahne und lenkt sie in Strömungsrichtung aus.
Der am Fuße der Windfahne befestigte Permanentmagnet betätigt den Wächterkontakt.
Der Schaltpunkt ist nicht einstellbar.

Advantages

• Simple construction make the units highly reliable.
• High grade steel model for use with aggressive media or in aggressive environment.
• Models available in sea-water resistant gun metal for use in marine or tropical climates.
• Explosionproof models available to several standards.
• The units operate in any position.
• No maintenance needed.
• Long-term continuity of spares availability.

Suitability

• Pump pressure control.
• Air pressure control.
• Controlling of liquid levels under atmospheric pressure.
• High pressure gas control.
• Leakage control.
• Compressor control.