BDS SYSTEMS INC.
TANK ALARM TELEMETRY SYSTEM
Model 440

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Master Terminal Unit Remote Pipeline Unit

The Model 440 Series System was developed to monitor tank product levels and alert pipeline personnel of a potential tank overfill. Over dedicated lines, this duplex system continuously transmits data between the Master Terminal Unit and the Remote Pipeline Unit. When a tank's high level monitoring device detects a high alarm or if transmission is broken, the system alerts pipeline and terminal personnel of a problem. The system supports up to four (4) normally open or normally closed contacts.

FEATURES
  • Transmits and receives tank high alarm information over a voice grade telephone line
  • Four (4) transmit channels, four (4) receive channels, two-way duplex operation
  • Operates over any distance where telephone lines exist
  • The Master Terminal Unit & Remote Pipeline Unit have the same electronics
  • Suitable for monitoring alarms, starting or stopping pumps, opening or closing valves
  • Ready and easy to install and service, no extra parts required
  • Input/Output wiring on plug-in terminal blocks
  • LED’s continuously display system’s operation
  • Transmits information in two directions, can be wired for loop back operation
  • Small size, reliable & flexible
  • All solid state electronics - lightning, noise and surge protection circuitry
  • Enclosure - polycarbonate NEMA 4X water and dust-tight

OPERATION

The TANK ALARM TELEMETRY SYSTEM monitors, transmits and receives tank high level alarm information. The system consists of the Master Terminal Unit (MTU) and the Remote Pipeline Unit (RPU). The MTU transmits the status of up to four (4) input channels (dry contact closures) over a twisted pair of wires or a voice grade telephone leased line to the RPU. The RPU will activate up to four (4) form "C" relay output relays thus reproducing the status of the original MTU’s inputs. At the same time and in an identical manner, up to four (4) input channels at the RPU can be transmitted back to the MTU. The loop back feature provides the means of returning the received signal back to the originating unit. This provides fail safe verification that the original transmitted signal was received by the other unit and that the output relay was activated. Illuminated LED’s on the MTU and RPU indicate that the input signals have been transmitted and the output signals have been received. An illuminated communication fault LED (red) indicates that the communication link between the two units has failed or has been lost.

In a normal open (NO) high alarm condition, the MTU (Channel #1) provides a 12 volt DC loop through the terminal’s tank High alarm circuit. The High alarm input information is transmitted to the RPU where a relay (Channel #1) is energized, providing a dry contact closure for the pipeline’s High alarm circuit. An illuminated LED at the MTU indicates the information has been transmitted, while an illuminated LED at the RPU indicates the information has been received. With this loop back feature for this alarm, the RPU transmits this input information back to the MTU, illuminating the channel #1 received LED. The High/High alarm on channel #2 operates the same as the High alarm on channel #1. Channel #3 and #4 are spares available for additional information. A High or High/High alarm at the terminal (RPU) is transmitted to the pipeline (MTU), and the loop back feature transmits this information back to the terminal (RPU).

SPECIFICATIONS
  • MASTER & REMOTE UNITS (each unit)
    • Four (4) transmit channels monitor a closed loop (12 volt loop voltage supplied)
    • Four (4) receive channels provide energized relay form "C" contacts
    • ENCLOSURE: Polycarbonate NEMA 4X (watertight & dust-tight) suitable for wall mounting
    • Input/Output wiring connections, enclosed type, plug-in terminal blocks
    • LED’s continuously show operational status (Transmit, Receive, Comm Fault)
    • Lightning and surge protection circuitry
    • Telephone connection RJ11 or terminal block
    • POWER: 115VAC, 60Hz
    • EQUIPMENT: Enclosure fiberglass, clear screw cover with display LED's
    • DIMENSIONS (overall): 11 X 8 ½ X 3 1/8 inches, Weight: 2 ½ lbs. each
     Specifications subject to change without notice
    Meets Colonial Pipeline’s Terminal High Tank Level Alarm requirements for monitoring a terminal's High and High/High tank alarms and transmitting this information back to the Colonial Pipeline office.
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