Rosemount TankRadar Rex DAU 2100, Service Manual

Page: 24 / 154

Rosemount Tank Radar Rex
Chapter 3 Device Description
3-10
Service Manual
308012En, Ed.2
May 2013
3.1.6 Internal calculations
TankRadar Rex is designed to make inventory calculations directly in the
gauge to be used by a DCS system, or give precise inputs for tank
calculations in another computer. The gauge can receive and process
signals from analog and digital pressure transmitters, water bottom
sensors etc. All measured data are transmitted on the field bus and can
be further processed in the control room by the TankMaster PC software
or by the plants host computer/DCS system. Due to the high processing
capacity, inventory calculations can be made by the signal processor in
the gauge without any separate field computer.
Figure 3-10. Hybrid tank gauging combines radar and pressure mea-
surement to get density and mass information online.
The gauge calculates:
• Total observed volume using the tank strapping table
• Mass (if pressure sensor connected)
• Observed density (if pressure sensor connected)
• Level (corrected for thermal tank wall expansion)
• Temperature
• Oil/Water interface level
Strapping table data downloaded from the Rosemount TankMaster PC
software are resident in the gauge.
All data is calculated according to updated API and ISO standards. The
temperature calculations include API algorithms to handle elements
close to the bottom.
The level value is software corrected for changes in tank reference
height.
Both metric and USA/UK units are supported.