Stellar – Pressure Based Level Transmitter

Sapcon’s STELLAR is a pressure based level transmitter. It is a complete resource measurement solution for inventory estimation. The measurement is produced directly in units of volume and/or mass by deploying level measurement principles. It is ideal for applications dealing with fresh­water, distilled waster, fuel­ oil, lubricating oil, HSD. It is also useful for bulk measurement in shipping vessels.

  • Differential Pressure sensor by Druck GE
  • Depending on fluid type and approval requirement, proper DP sensor selection is needed.
  • Isolated 4-20mA output can give 1000 ohm output drive for 24 volt DC external power supply loop or 700 ohm from internal supply

Salient Features of Stellar Pressure Based Level Transmitter

  • Password Protection: Security against tampering or unintended editing
  • Password retrieval if forgotten or lost
  • Compatible With IPMS (Integrated Platform Management System)
  • Mass, Volume & Percentage Display: Strap-chart editing
  • Immune to turbulence: Rolling ­Pitching neutralizing algorithm
  • USB ­ RS485 Interface: Easy calibration, easy configuration

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Resource Monitor & Indicator

A RISC core microcontroller of the tank gauging hardware, utilizes the pressure ­to­ level information sent by the DPL­ sensor, and converts it faithfully to Volume and Mass depending on strap­-chart and density information provided in its configuration. 24 Bit ADC and 32 bit arithmetic along with spline ­curve based strap-chart evaluation algorithm ensures the true indication of volume and mass of the material inside the tank.

  • Low Power Consumption: Less heat, long life; Maximum 2.4 watt
  • Wide Range Power Supply: 90 to 265 V AC; supports all on­board supplies
  • High Resolution Output: 7 digits; down to 1 litre volume resolution
  • Mass, Volume & Percentage Display: Strap-chart editing
  • Galvanically Isolated 4-20mA 1000 Ohm series load @ 24 V DC loop supply
  • Thermal drift compensated stable operating characteristic
Mechanical Specifications


  • Cast Aluminium, weather­proof for local indication types and breather units
  • SS or MS (Powder-coated) panel for multiple panel and distribution box

Cable Entry

  • Single / Double compression gland


  • Screw: 1″ to 1 1/2″ BSP / NPT (M)
  • Flanged: As per order
  • Material: SS / MS (Plated) to hold DP sensor

Ambient Temperature

  • 0°C to 70°C



  • Single Channel: Wall mounting
  • Multi Channel: Panel mounting
Electrical Specifications


  • 85 to 265 V AC, 50 / 60 Hz

Power Consumption

  • Less than 2.7 VA


  • 4 to 20mA, Max load @ 24Volts: 1000 Ohm proportional to level, mass or volume

Calibration & Strap Chart Entry

  • On­board 8 digit display and 6 key keyboard. Also through RS­485 interface

Information Display

  • Level, mass & volume display selectable

Alarm Outputs

  • Two onboard relays selectable for level, mass or volume (independent combination)


  • PC interface for strap chart entry and tank technical database management. This will eliminate the tedious strap­chart entry in case of unit transfer from one tank to the other.


Data Entry

  • Single Channel: 6­ key keypad & PC interface
  • Multi Channel: 12 ­key keypad & PC interface


  • Strap-Chart (Tank Table),
  • Density
  • Two alarm relays for Level / Mass / Volume
  • 4­-20 mA for Level / Mass / Volume
  • Password Change
  • Password Lost and Retrieve
  • 2 point calibration for tank & sensor

Power Supply

  • 90 to 265 V AC @ 50/60Hz (2.4 W max), 24 V DC optional

Diagnostic Functions

  • Sensor Error, Under­-range, Over­-range, Strap-Chart Entry Error, Calibration Error

Alarm (2 Relays)

  • Settable in Level / Mass / Volume independently
  • Single point and 2 point alarms per relay
  • Fail­-safe selection Cover & Uncover delay settings

Alarm Outputs

  • Two onboard relays selectable for level, mass or volume (independent combination)

Accuracy & Conversion

  • Better than 0.5% of full scale smoother level to volume interpolation
Application Specifications
  • Fresh­water
  • Distilled water
  • Fuel­ oil
  • Lubricating oil
  • HSD
  • Bulk measurement in shipping vessels



  • CE Marking
  • ROHS compliance


Switching Indication