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BABBITT LS8500 Owner's Manual

Presence/absence switch
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LS8500 Presence/Absence Switch
OWNERS MANUAL
♦ INSTALLATION
♦ CALIBRATION
♦ TROUBLESHOOTING
♦ WARRANTY
Reference Manual
2020 Rev.2
P.O. Box 70094
Houston, TX 77270
(713) 467-4438

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  • Page 1 Reference Manual 2020 Rev.2 LS8500 Presence/Absence Switch OWNERS MANUAL ♦ INSTALLATION ♦ CALIBRATION ♦ TROUBLESHOOTING ♦ WARRANTY P.O. Box 70094 Houston, TX 77270 (713) 467-4438...

  • Page 2: Table Of Contents

    www.babbittinternational.com Reference Manual 2020 Rev.2 TABLE OF CONTENTS Page 1. Description -------------------------------------------------------------------- 1 A. General Description ------------------------------------------------ 1 B. Specifications ------------------------------------------------------1-2 2. Theory of Operation/ Ordering Information ------------------------------ 3 3. Installation ---------------------------------------------------------------------3 A. Inspection ------------------------------------------------------------ 3 B. Physical Installation of Probe ------------------------------------- 3 C.
  • Page 3 High voltage that may be present on leads could cause electrical shock. Make sure the main power to the Babbitt LS8500 Presence/Absence switch is off and the lines to any other external power source are disconnected or not powered while wiring the instrument.

  • Page 4: Description

    A. General Description The LS8500 is a point level switch that detects the presence or absence of material in a pipe. The basic unit is made up of a solid stainless steel flange attached to an explosion proof housing. Inside the explosion proof housing is a transmitter that is connected to the receiver board by a twisted, shielded pair of wires.
  • Page 5 Reference Manual 2020 Rev.2 C. Ordering Information LS8500 - 115VAC - FP - 4” 150# - PR Model # (LS8500) Power Supply: (115VAC 24VDC 12VDC 220VAC) Sensor Type: (FP-Flange Probe or TC-Tri-Clamp) Sensor Size: Flange Model: (PR-Partial Ring or FR-Full Ring)

  • Page 6: Theory Of Operation/ Ordering Information

    2. THEORY OF OPERATION The LS8500 employs a radio frequency (RF) balanced impedance bridge circuit to detect if the sensing element is in contact with the material that is to be sensed. When material is not in contact with the sensing element, the bridge is balanced by turning the adjustment pot to find the threshold where the red led goes out.

  • Page 7: Installing The Receiver

    Reference Manual 2020 Rev.2 NOTE: LS8000 AND LS8500 ELECTRONIC COMPONENTS ARE INTERCHANGABLE...

  • Page 8: Typical Applications And Wiring Diagrams

    Reference Manual 2020 Rev.2 NOTE: LS8000 AND LS8500 ELECTRONIC COMPONENTS ARE INTERCHANGABLE.
  • Page 9 www.babbittinternational.com Reference Manual 2020 Rev.2...
  • Page 10 www.babbittinternational.com Reference Manual 2020 Rev.2...

  • Page 11: Calibration

    2020 Rev.2 4. CALIBRATION PLEASE READ THE ENTIRE CALIBRATION PROCEDURE BEFORE CALIBRATING THE LS8500. If no time delay is required, turn the time adjustment pot completely CCW and set S1 down, S2 up. The potentiometer has 20 turns and freewheels at the end of its travel without damage. You may hear “clicks” at the end of travel.

  • Page 12: Sensitivity Calibration

    No routine maintenance is required other than keeping the interior of the unit clean and free of dirt, dust and other contaminants.The LS8500 consists of three main sub-assemblies. These are the enclosure with the flange probe, the transmitter module and the receiver card. The following troubleshooting guide will assist in determining how to correct most of the problems which may occur in the field.
  • Page 13 www.babbittinternational.com Reference Manual 2020 Rev.2 PROBLEM POSSIBLE CAUSE SOLUTION RED LIGHT cannot be Transmitter module not connected Plug transmitter into flange. adjusted to turn on. to flange. No power to unit. Check for correct power. Blown on-board fuse. Replace fuse. Bad receiver card.

  • Page 14: Warranty

    2020 Rev.2 6. WARRANTY All components of the LS8500 are warranted to be free from defects in material and workmanship for a period of two years from the date of purchase. This warranty applies to general purchaser and to components installed, serviced and operated according to instructions.

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