Greyline TFT32 Tank Farm Transmitter System

Standard features include:

TANK FARM TRANSMITTER SYSTEM SPECIFICATIONS

SCOPE: This specification covers a Tank Farm Level Monitoring System as manufactured by Greyline Instruments Inc., Massena, New York / Long Sault, Ontario. The system and instruments shall provide for local indication and control, RS485 serial transmission, and central PC computer monitoring of the network.

A. _PERFORMANCE SPECIFICATIONS

  1. To consist of one RS485 Transmitter/Enclosure per tank, with built-in digital display, signal relay and calibration keypad. Up to 32 Transmitters may be included in a multi-drop network.
  2. To include one sensor per tank, each connected to a RS485 Transmitter. Sensors may be: non-contacting ultrasonic, loop-powered pressure, or any existing 4-20mA transmitter. Sensors may transmit level or any other process variable including flow and pH.
  3. To include 18 gauge, 4-conductor, shielded multi-drop cable from TFT32 Transmitter to Transmitter up to 10,000 ft (3050 m) length to a PC computer, or to a dial-up modem and telephone line.
  4. To include RS485 to RS232 Converter for network connection to a PC computer.
  5. To include supervisory PC Software to monitor, display and datalog levels or process variables from all the RS485 Transmitters in the network. The network shall run independently of the PC and Software, providing reliable local indication and control even without PC connection.

B. _SENSORS

Sensors may be Ultrasonic, loop-powered pressure gage, or any other 4-20mA transmitter, and each Sensor shall be connected directly to one RS485 Transmitter/Enclosure. Sensors shall be selected by application considerations:

  1. ULTRASONIC SENSORS - constructed of PVC and Teflon, or all-teflon for chemical compatibility and shall include integral, automatic temperature compensation. Shall have a minimum deadband or blanking of 12" (305 mm) and a maximum range of 32 ft. (10 m), or a minimum deadband of 24" (610 mm) and a maximum range of 50 ft. (32 m). Operating frequency shall be 42 kHz with an ultrasonic beam angle of 8°. Ultrasonic Sensor operating temperature shall be from -40°F to 150°F (-40°C to 65°C). Intrinsically safe rating is optional for hazardous locations.
  2. PRESSURE SENSORS - two-wire, gage type shall be constructed of stainless steel with integral temperature compensation. Shall be threaded type for installation at the base of a tank, or submersible type for installation from the top of the tank. Shall be rated for operating temperatures from -20° to 190°F (-29° to 82°C)
  3. 4-20mA TRANSMITTERS - shall provide level, flow, pH or any other process variable to be monitored in the network and shall be:
    a) loop-powered (sink) Transmitters or
    b) separately powered (source) Transmitters

C. _SENSOR CONNECTING CABLE - shall be installed in grounded metal conduit

  1. ULTRASONIC SENSOR CABLE - Provide RG62AU coaxial cable 20 ft. (6m) continuous length, with each Sensor. Extended sensor cable shall be RG62AU coaxial to a maximum length of 500 ft. (152m). Cable shall be spliced with screw terminal connections in manufacturer's recommended steel NEMA4 Junction Box. Level and temperature signals shall be conducted on one single coaxial cable.
  2. PRESSURE SENSOR CABLE -
    a) threaded type Sensors shall include 2 ft. (0.6 m) long molded polyurethane jacket, 2-conductor, shielded with breather tube. Extended cable shall be 2-conductor 18 gage shielded, twisted pair to a maximum length of 10,000 ft. (3050m). Cable shall be spliced with screw terminal connections in manufacturer's recommended steel NEMA4 Junction Box.
    b) submersible type Sensors shall include polyurethane jacketed cable with strain wire and vent tube sufficient length for suspension from top to the bottom of the tank. Extended cable shall be 2-conductor 18 gage shielded, twisted pair to a maximum length of 10,000 ft. (3050 m). Cable shall be spliced with screw terminal connections in manufacturer's recommended steel NEMA4 Junction Box.
  3. 4-20mA TRANSMITTER CABLE - Shall be 2-conductor 18 gage shielded, twisted pair to a maximum length of 10,000 ft. (3050 m). Cable shall be spliced with screw terminal connections in manufacturer's recommended steel NEMA4 Junction Box.

D. _RS485 TRANSMITTER/ENCLOSURE

  1. The Indicating Transmitter shall be housed in a wall-mount, watertight NEMA4X (IP67) enclosure with clear, polycarbonate cover. Mounting hardware shall be included.
  2. Transmitter shall include a large 4-digit LCD display with 3/4" (19 mm) high digits that shall be visible without opening the enclosure cover.
  3. The transmitter shall provide for field-calibration via built-in 2-key calibration system.
  4. Calibration data shall be permanently stored through power interruptions without requirement of a back-up battery.
  5. Field calibration shall allow keypad selection of measurement span, operating modes, and display units in any engineering units including percent, inches or centimeters.
  6. Transmitter shall permit field programmable damping and spike rejection to smooth output as required.
  7. Transmitter operating temperature shall be from -13°F to 140°F (-25°C to 60°C).
  8. Transmitter shall have isolated RS485 serial output with selectable baud rates from 2400 to 19200.
  9. Provide one signal relay contact rated 1 ampere. Relay shall be programmable for single set point alarm, pump control, temperature and/or signal/echo loss alarm.
  10. Transmitter electronics shall be surge protected on DC power input, sensor and RS485 output.
  11. Transmitter power input shall be 24VDC with power consumption of 120mA (3 watts) or less. AC power input shall be optional.

E. _ADDITIONAL CONTROL RELAYS

  1. Additional control relays shall be housed in watertight NEMA4X (IP 66) fiberglass enclosures and may installed at any location in the network.
  2. Each Relay board/enclosure shall include 12 control relays rated 5 ampere SPDT.
  3. Up to 10 Relay Boards may be installed in the network.
  4. Individual control relays may be assigned to any TFT32 Transmitter at any location in the network. Up to 5 additional relays may be assigned to one TFT32 Transmitter.
  5. Control relays shall be independently programmable by PC software for alarms or pump control with adjustable ON/OFF set-points.
  6. Control relays shall function by direct communication with TFT32 Transmitters for system reliability without a PC monitoring the network.

F. _SYSTEM POWER SUPPLY

  1. Shall be housed in a watertight NEMA4X (IP 66) enclosure and installed at a convenient location within the network. Shall accept 120VAC 50/60Hz (240VAC 50/60Hz optional) power input and deliver 24VDC power output. Shall be rated for 150W power output or sufficient to provide 24VDC power to all RS485 Transmitters and Relay Boards in the network.

G. _RS485/RS232 CONVERTER

  1. Shall be installed within 25 ft. (8 m) of the PC computer to convert RS485 serial network signals to RS232 for direct connection to the PC COM port.

H. _PC SOFTWARE

  1. System shall include password-protected PC software for Windows™ 3.1+, 95 or NT. Software shall be supervisory in function and shall not be necessary for operation of Transmitters, Control Relays and Sensors in the network.
  2. Software shall provide for display of level (or any other process variable), in any engineering units, for up to thirty-two RS485 Transmitters in the network.
  3. Software shall display relay status of each RS485 Transmitter's built-in relay, plus any additional relays installed in the network.
  4. Software shall provide for independently programmable data logging of each tank level (or other process variables). Separate data log files shall be written on the PC computer's Drive for each Transmitter in the network.
    - Inventory Logging shall store date and time-stamped values at up to 6 preset times each day.
    - Trend Logging shall permit continuous data logging at independently programmable time intervals of 10 seconds or greater.
  5. PC software shall provide for multiple dial-up locations where one or groups of RS485 Transmitters are connected to the network by modem. Software shall automatically scan the entire network and enable dial-up connection to multiple remote modems.
  6. Optional client software for PC LAN networks shall be available for LAN users to monitor RS485 Transmitters and to write separate data logging files. LAN client versions of software shall not permit calibration changes. Client software shall operate on any LAN protocol compatible with Windows™ 3.1+, 95 or NT.

I. _ADDITIONAL FEATURES FOR INSERTION IN SPECIFICATION AS REQUIRED:

  1. Transmitter power input shall be 100-130VAC 50/60Hz with maximum power consumption of 5 watts or less.
  2. Transmitter power input shall be 200-250VAC 50/60Hz with maximum power consumption of 5 watts or less.
  3. Include manufacturer's recommended sensor cable Junction Box for extended sensor cable lengths.
  4. Sensor shall be rated intrinsically safe or explosion proof for Class I,II,III, Div. I,II, Groups C,D,E,F,G hazardous locations.
  5. Include extra Relay Board(s) housed in watertight NEMA4X enclosure. Each Relay Board shall contain 12 control relays rated 5 ampere SPDT. Individual relays may be assigned to any TFT32 Transmitter in the network.
  6. Include V.32 modem for each dial-up location.

J. _MANUFACTURER

The RS485 Transmitters shall be Model TFT32 Tank Farm Transmitter as manufactured by Greyline Instruments Inc., and warranted against defects in materials and workmanship for one year. PC software shall be Greyline TFS Tank Farm Supervisor for Windows™, and optional Greyline TFC Tank Farm Client for LAN's. Control Relay Boards shall be Greyline Model RB12-24V.