This may lead to temporarily freeing fouled sensors thus leading the operator to assume proper operation when in fact the sensor actually requires cleaning and maintenance. The MagLift™ mechanism is a magnetically coupled testing mechanism which can only transfer sufficient force to the sensor to successfully test it if it is not fouled. The diagram on the right shows the testing sequence for level sensors equipped withMagLift™. For internal floating roof (IFR) tanks the Versalevel™-02 sensor is normally recommended. This is a dual displacer switch where the internal floating roof normally lifts the displacers sequentially (hi then hi-hi) to generate the alarms. As with the DuoCheck™ sensor, the Versalevel™ is tested using the MagLift™mechanism. Should the internal floating roof be sunk, or if product is on top of the roof, the displacers are sufficiently buoyant to activate the mechanism. For external floating roof (EFR) tanks the Versalevel™-X sensor is normally recommended. In EFR tanks, wind, ice and snow prevent the use on displacer-type sensors; hence, the Versalevel™-X employs a heavy float on a rod containing an internal tilt switch. The float/rod assembly is suspended from the tank shell, and must be tilted to a 45˚ angle to activate the alarm. As with the standard Versalevel™ sensor, the float on the Versalevel™-X is sufficiently buoyant so as to detect liquid if the roof has sunk or if water has accumulated on the roof. The Versalevel™-X is also useful for fixed roof tanks containing viscous, dirty, or sticky products. The Versalevel™-X is equipped with a pull-to-test lanyard which is attached to the bottom of the float/rod which tips the sensor up to an angle sufficient to activate the tilt switch. MagLift™ Operating Principle OMNTECMfg., Inc. 1993 Pond Road Ronkonkoma, NY 11779 Phone: (631) 981-2001 Fax: (631) 981-2007 E-mail: [email protected] Website: www.innovative-sensor.com Document No. 600221 Versalevel™-X For external floating roof tanks
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