APT 1000 Intelligent Hydrostatic Level Transmitter

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DAT 57N APT 1000 Intelligent Transmitter

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APT 1000 Intelligent Hydrostatic Level Transmitter for Marine Tank Gauging


  • Robust all welded submersible construction
  • Choice of construction materials compatible with all common marine liquid measurement applications
  • Process connections and fixings for side of tank or submersible installation
  • Simple to install, accurate and stable, robust and reliable
  • Gauge or Absolute options with a wide measuring span and 0.1% performance
  • Dual -mode operation provides outputs as 4-20mA and RS485 Modbus
  • Fully Programmable for calibrated range and application parameters
  • DNV Type Approved an d IEC Ex /ATEX certified for hazardous areas (Zone 0)

PSM has drawn upon nearly 40 years of global marine application experience in developing the APT 1000 to provide a liquid level transmitter that delivers the highest possible standards in terms of performance, versatility, functionality and reliability.
The APT 1000 provides a reduced weight and size compared to previous generations and takes full advantage of advances in electronic design and sensing technology to provide enhanced accuracy and stability under varying operating temperatures. Body construction is all laser welded and internally encapsulated, eliminating any possibility of leaks, and all versions are IP68 certified suitable for full immersion to a minimum of 50 Metres WG. A choice of construction materials, Stainless Steel, Titanium, and Hastelloy, ensure corrosion resistance in all applications and all measurement ranges will tolerate an overload of 2 x nominal range with no adverse effects to performance or calibration.
The transmitters electronics are fully integrated within the body and incorporate a powerful micro-controller to precisely monitor and process the output of the pressure cell. On-board non-volatile memory allows each transmitter to be fully configured for its intended duty either during manufacture or subsequently while in operation.
The transmitter is certified according to ATEX and IECEx regulations for installation in a hazardous area and Type Approved by DNVGL as suitable for use in marine applications.

The APT 1000 is a duel-mode transmitter providing an analogue 4 -20 mA signal and a multi-drop RS485 Serial communication based on industry standard Modbus RTU protocol. Either or both outputs can be used in normal operation. The unit is fully programmable using the ACU1000 application available as free download from PSM.

When installing multiple digital mode enables significant cost and weight savings, removing the need for separate cable runs to each transmitter by utilising a single Multi-drop cable for both power and RS485 network. PSM RFM series termination and Safety barrier modules are used to save typically more than 50% of installation time and costs.

Partnering the APT 1000 PSM can offer display options to provide a complete tank gauging solution. The VPM4300 Series touch screen display provides a clear presentation of all tank data for smaller tank gauging systems, while our VPM+ and VPMS based packages provide comprehensive functionality for larger Vessels.
All systems provide full configuration capability for the APT1000 eliminating the need for specialist calibration equipment and both are capable of delivering tank level status via serial link to other onboard systems such as Load Computers or Alarm Monitoring Systems.