Four years of research and development by Honeywell Ltd. of Toronto have resulted in a new safety device for the petroleum industry: the Optic Liquid Level Sensor (OLLS). The new product is designed to detect fluid levels in tank trucks or storage tanks during filling by means of a signal received from the control monitor transmitted via fibre optic cable to the sensor's probe, which protrudes into the storage tank or each of the product compartments on a tank truck. When an overfill condition occurs, a glass prism at the tip of the sensor's probe is submerged in the petroleum product, and at this time the pulsed light is refracted from the prism base into the product, causing a loss of electronic signal. The control monitor senses the loss and automatically ends the filling operation. The OLLS is safe and can be used for Class I, II and III petroleum products. As optic technology is used in the OLLS, no electrical power is present inside the product compartment. Safety features include an automatic shutdown system with any component failure; an intrinsically safe 24-volt DC, maximum 60 milliamp barriered control monitor, and an all solid state design to preclude mechanical failures. In addition to these, the control monitor also monitors ground faults. Thus, if resistance to ground is 10,000 ohms or greater, the control monitor will not alow a filling operation.

  • Corporate Authors:

    Transportation Development Agency Centre

    800 rene-Leveque Boulevard West, Suite 600
    Montreal, Quebec H3B 1X9,   Canada 
  • Publication Date: 1976

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Filing Info

  • Accession Number: 00142626
  • Record Type: Publication
  • Source Agency: Transportation Development Agency Centre
  • Files: TRIS
  • Created Date: Dec 15 1976 12:00AM