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133-RCU Redundant Communication Interface Unit

SBEM’s Redundant Communication Interface Unit 133-RCU is a robust and advanced solution designed for global tank inventory management systems. Engineered for real-time, uninterrupted monitoring, the 133-RCU provides hot standby redundancy and ensures continuous data flow from SBEM’s Smart Tank Data Transmitters and Servo Gauges to the control room. Capable of managing up to 32 tanks, it delivers accurate tank level, temperature, interface level, and density data with less than two seconds of update time. Featuring an 11-digit LED display and built-in keyboard, operators can configure alarms, calibrate gauges, and schedule data prints. It includes programmable alarms for four levels and one temperature per tank, along with leak detection capabilities. The 133-RCU offers direct MODBUS outputs to three hosts and is housed in a modular 19-inch rack mountable system with in-built diagnostics, surge protection, and galvanic isolation. It is ideal for oil, gas, and chemical industries where reliability and data accuracy are critical.

  • Features
    • Hot standby and redundancy
    • Configured for redundant operation to provide uninterrupted data to control room
    • Real-time, on-line, indication of level in mm and temperature in C (with tank number) for up to 32 tanks
    • Accepts inputs from SBEM Smart Tank Data Transmitter and Servo Gauge
    • Indication of alarm and diagnostic data
    • Indication of interface level and density (in case of Servo Gauge)
    • Direct printing of tank data at pre-programmed interval
    • Keys for full operator access to Servo Gauge functions, including calibration
    • Direct MODBUS output for up to 3 hosts
    • User programmable alarms for 4 levels and 1 temperature alarm per tank
    • Leak alarm with programmable rate
  • Specification
    Specification Details
    CIRCUITRY
    Microprocessor Based
    CPU Z-80, 4 MHz
    RAM 8K Battery backed
    RTC In-built
    LEVEL AND TEMPERATURE INDICATION
    Input / Output / Command ASCII coded signal from SBEM Smart Tank Data Transmitter and Servo Gauge via 2-way 1/2 wire RS 485 bus
    Display – 11 digit, 1/2” high 7-segment LED to simultaneously display:
    – CU connection no. (2 digit)
    – Level in mm (5 digit)
    – Temperature in °C (4 digit)
    – Indication of interface level and density (in case of Servo Gauge)
    Data Update Less than 2 seconds
    COMMUNICATION
    With STDT &/or Servo Gauge On RS 485 port, Baud rate 1200 (standard), 2400 (optional)
    With Computer On RS 232C port, Baud rate 2400 (standard), 4800 (optional)
    With Printer On RS 232C port, Baud rate 1200 (fixed)
    Note * IBM compatible PC-AT minimum
    * Dot matrix printer with serial interface card
    PROGRAMMING AND OPERATOR INTERFACE
    Keyboard In-built keyboard with 13 keys for operator interface – to select tank no., for tank data display and program alarms, date/time, auto printing time interval.
    7 additional keys provide operator full access to the Servo Gauge functions.
    ALARM ANNUNCIATION (IN-BUILT)
    Level Alarms Programmable 4 alarms per tank – LL, L, H, and HH
    Temperature Alarm Programmable 1 alarm per tank – TH
    Leak Alarm Programmable
    Alarm Indication Alarm annunciated on display – display flashes showing tank no. and alarm type.
    On acknowledgment, alarms stop flashing on the keyboard, and display returns to normal tank data display.
    Alarm values are stored in non-volatile RAM.
    POWER SUPPLY
    Voltage 110/230 VAC, ± 10%, 50 Hz, 67 VA
    CABLING
    Connections From STDT &/or Servo Gauges in field to ITU in control room
    Configuration Up to 16 transmitters can be looped on a single cable loop.
    Power (110 VAC) 2 core, 1.5 mm² copper / 2.5 mm²
    Signal (RS 485) 2 core (1 twisted pair)
    Impedance Rmax = 200 Ω, Cmax = 1 F
    Distance Up to 1200 Mtrs. (More distance possible with Line Drivers)
    PROTECTION
    Isolation Opto isolators provide galvanic isolation between input/output signals and processor circuits.
    Surge Protection Surge protection using Metal Oxide Varistors.
    SELF DIAGNOSTICS
    System Monitoring In-built on-line diagnostics checks transmitted signals and displays error messages.
    Off-line diagnostics checks internal circuitry.
    Surge protection using Metal Oxide Varistors.
    ENVIRONMENT
    Ambient Operating Temperature 0°C to +50°C
    Relative Humidity 95% maximum, non-condensing
    MOUNTING & ENCLOSURE (OPTIONAL)
    Mounting Type Table top / flush panel mounting, enclosure 19” full rack – IP 30
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