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139 M series Servo gauge

SBEM’s Servo Gauge Series 139M is a globally recognized, high-precision instrument designed for accurate measurement of product level, interface level, density, and temperature (with an external sensor). It integrates advanced microprocessor technology and a high-sensitivity weight sensor that continuously monitors the equilibrium tension of a suspended displacer, enabling real-time and on-demand density measurements. Compatible with HART® protocol pressure transmitters, the system ensures optimal accuracy, while features like wave integration, automatic calibration, and compensation for tank deformation enhance operational efficiency. The Servo Gauge 139M supports two-wire RS-485 transmission, allowing data from up to 16 gauges to be looped efficiently. It offers remote and local calibration and alarm functions. It complies with SIL2 safety standards, making it ideal for inventory management in tank farms and bulk storage operations. With robust SS316 construction, explosion-proof certification, and compatibility with MODBUS, STI, CIU, and temperature averaging sensors, the 139M is a dependable solution for global industries seeking high-accuracy level and density measurement systems.

  • Features
    • SIL2 Certified
    • Level, Interface Level and Density measurement in one instrument
    • Average temperature measurement with external temperature sensor
    • Two density measurement options viz., on demand spot / average density (Density profile on request) and real time average density (using pressure transmitter)
    • Two wire transmission bus allows looping, reduces cabling
    • Automatic calibration of product level and compensation for density variation
    • Automatic compensation for wire weight and tank deformation
    • Wave integration in level measurement
    • Accepts external current input and contacts to transmit data to control room
    • Local and remote repeatability check
    • Field calibration and checking through a portable programming unit possible without opening the
  • Specification
    Specification Details
    LEVEL AND INTERFACE LEVEL MEASUREMENT
    Measuring Range 0-27000 mm (Standard), 0-37000 mm (On request)
    Level Accuracy ± 0.6 mm*
    Sensitivity ± 0.1 mm*
    Repeatability ± 0.1 mm*
    Interface Accuracy ± 2 mm*
    Resolution 1 mm or 0.1 mm (Selectable)
    Displacer Speed 2400 mm/min (Maximum)
    Displacer Diameter 90 mm (Standard), 45 mm & 65 mm (Optional)
    DENSITY MEASUREMENT ACCURACY
    On Demand ± 0.005 gm/cc
    Real Time ± 0.08% *
    Note * With a pressure transmitter of accuracy ± 0.04% of URL.
    Accuracy of real-time density measurement is a function of the accuracy of the pressure transmitter.
    TEMPERATURE MEASUREMENT
    Measuring Range -200°C to +200°C
    Accuracy ± 0.2°C
    Resolution 0.1°C
    Sensor Type RTD Spot / Averaging (Multi-point / Multi-element), Maximum 14 nos.
    LPG MASS MEASUREMENT
    Accuracy ±1.3% of reading with SG density, ± 0.3% of reading with manually entered density
    Resolution 0.01 Metric Tonnes
    ENVIRONMENT
    Ambient Operating Temperature -10°C to +60°C (Standard), -50°C to +85°C
    Storage Temperature -50°C to +85°C
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