FLOW SWITCH TYPE 31D

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- specification

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- EARL air flow switches
- EARL flow switch type 41vS

Flow switch type 31d
Flow meter type 31az
Flow transmitter types 31afi, 31afp

These rugged and hard wearing float operated units measure and control gases and uncontaminated liquids. The units can be mounted in either horizontal or vertical pipes, DN 15 to DN 150, and are suitable for use with pressure ranges PN 10 to PN 320.

Operation

When the medium enters in the direction of flow as indicated by the arrow it displaces the float before escaping through a slot located in a cylindrical sleeve. A magnet attached to and moving with the float, transfers this movement to perform a function according to the type of unit. With the type 31d it operates one or more switch contacts, with the type 31az it operates the magnetic coupling of the indicator, and with type 31afp and type 31afi it operates the magnetic coupling of the pneumatic transformer.

Advantages

• Float operated units resistant to wear and tear.
• High sensitivity where it is required, e. g. in the lower range.
• Excellent set point repeatability.
• All metal units, suitable for high pressure.
• Solid plastic model for use with aggressive media.
• Explosionproof models available to several standards.
• Models available for use in maritime and tropical climates.
• Simple installation and connection.
• Units virtually maintenance free.
• Long term continuity of spares availability.

Suitability

• Protection against pumps running dry.
• Monitoring lubricating oil, cooling water, cooling air, hydraulic circulation systems and the circulation of cooling agents in refrigeration plants.
• Automatic control of filling and emptying processes.
• Flow control on steam generating boilers and heat exchangers.