EARL 241-244-246 LOW PRESSURE CONTROL SWITCHES AND METERS

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- EARL 188 pressure switch

Low pressure control switches and meters for
Differential pressure type 241
Negative pressure type 244
Positive pressure type 246

These spring supported diaphragm units are designed for long term operation and are used for the precise control and measurement of pressures in industrial plant, high value machines and apparatus.

They are capable of controlling and measuring low pressures from 0.1 mbar to 2.5 bar whilst remaining undamaged by high media pressure often experienced with differential pressure.

The set point of the control unit is available either fixed or adjustable.

Operation

The movement of the diaphragm is used to operate either a micro switch, explosionproof switch protective gas switch, an inductive switch or a pneumatically operated contact.

For units with local indicator the movement of the diaphragm is transferred via magnetic coupling directly to the indicator.

Advantages

• The units are sensitive and the simple construction makes them highly reliable.
• High static pressures do not damage the unit or affect adjustment.
• Reliable and suitable for long term operation.
• Models available for use in maritime and humid tropical climates.
• No maintenance needed.
• Long term continuity of spares availability.

Suitability of differential pressure switches

• Flow control in combination with differential pressure sensors, such as Pitot tube, orifice plate or Venturi tube.
• Filter control.
• Level control of pressurised containers.
• Leakage detection.
• Control of pressure fluctuations in compressors.
• Differential pressure control in gas turbines.
• Flap valve control.
• Burst control of containers.
• Suction sided pump control
• Pressure control of forced ventilation
• Ventilation control of supply and exhaust air.