Rosemount TankRadar Rex DAU 2100, Service Manual

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Rosemount Tank Radar Rex
Chapter 3 Device Description
3-14
Service Manual
308012En, Ed.2
May 2013
Input Register
Measured data is continuously stored in the
Input registers
of DAUs,
RTGs and FCUs. By viewing the contents of device input registers you
can check that the device works properly.
The following summary lists some frequently referred database registers:
Correction values
System configuration
Tank Dimensions
Unit ID Every RTG, DAU and FCU has a unique Unit ID
which is used to identify the unit when installing a
Rex system.
RTG address The assigned Modbus slave address for the RTG.
Default value: 246.
DAU address The assigned Modbus slave address for the associ-
ated DAU. Default value: 247.
FCU address The assigned Modbus slave address for the associ-
ated FCU. Default value: 245.
Tank Connec-
tion Length,
TCL The electrical distance from the Transmitter Head
Electronics to the RTG Reference Point (the electri-
cal distance is not equal to the physical distance).
The TCL value is different for different gauge types/
antennas. When configuring a Rex transmitter in
TankMaster WinSetup you can choose between
predefined or user-defined antennas (see Tank-
Master WinSetup Reference Manual). For a user-
defined antenna TCL must be manually entered.
For predefined antennas TCL is automatically set.
Tank Refer-
ence Height (R) The Tank Reference Height (R) is the distance
between the Tank Reference Point and the Zero
Level (Dipping Datum Point) at the bottom of the
tank.
RTG Reference
Distance (G) The RTG Reference Distance (G) is the distance
between the Tank Reference Point and the RTG
Reference Point. The RTG Reference Point is
located at the top surface of the customer’s flange
or manhole cover on which the gauge is mounted
as illustrated in Figure 3-12. For Still Pipe Gauges
the RTG Reference point is located at the hand-dip
mark on the Still Pipe Gauge Stand.
G is positive if the Tank Reference Point is located
above the RTG Ref Point. Otherwise G is negative.