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World's smallest vibration limit switch

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article image The FTL 20 offers high reliability/low cost environmental and equipment protection.

CLAIMED by manufacturer Endress+Hauser as the world's smallest vibrating level limit switch for liquids, the Liquiphant FTL 20 offers industry-standard process connections and open fieldbus interfaces in a robust package.

Using the time-proven vibrating fork principle, the FTL 20 offers high reliability/low cost environmental and equipment protection.

Designed to replace float switches, capacitance or conductive limit switches, optic sensors and gap switches, the device includes a number of design enhancements which have resulted in reduced physical dimensions and reduced maintenance costs.

The FTL 20 has no moving parts and virtually eliminates measurement inaccuracies and performance breakdowns due to mechanical fouling and failure. Switching is not affected by build-up, foam, turbulence, currents or air bubbles.

Compact and suitable for installation in coolant vessels, lubrication tanks and pump housings, the unit is 149mm long overall and is available with either 1/2" and 3/4" threaded connections for universal application.

The vibrating fork is only 38mm long. All wetted parts are Type 316L stainless steel.

Suitable for use with liquids of any consistency or toxicity up to 100°C, the unit is particularly suitable for overspill protection and minimum or maximum level detection in liquid storage tanks.

It can also be installed in pipelines to detect low liquid levels and prevent pump burnout.

The FTL 20 is available with either ac or dc power. The ac model includes an integrated 'load-check' feature which protects the switch against accidental short circuit or overload.

And, claimed by Endress+Hauser as a first for a device of this nature, the FTL 20 switch offers an ASi-Bus interface option for integration into existing fieldbus systems.

The large LED is visible across a wide arc and indicates the switch's operational status. The device also has an in-situ test feature which eliminates the need to remove the unit for any performance and functionality checks.

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