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Rosemount TankRadar Rex
Chapter 1 Checks and Adjustments
Commissioning Manual
308011En, Ed.2/Rev.B
June 2008
1.14 Data Acquisition Unit
1.14.1
Tank Information
•
Tank name
•
Unit ID
1.14.2
Distance
•
Check the distance between the Transmitter Head and the DAU.
The distance must not exceed 50 m.
1.14.3
Cable and Junction box
•
A shielded cable connected to ground must be used between the
RTG and the DAU. The shield shall be grounded in both ends. If
an extension cable is used, check that the junction box provides
good shielding too.
•
If a junction box is used, make sure that it is marked EExi.
1.14.4
Electrical check
DAU
•
Measure between 6-7 with X20 connected and disconnected. The
corresponding values are ~5.5 VDC and ~12VDC, respectively.
•
Make a note if the DAU is externally grounded.
1.14.5
Temperature
•
Check that the X1, X2 and X3 jumpers are selected according to
the current temperature range. Check that the reference resistor
corresponding to the selected temperature range is used. See
Installation Manual, chapter 4.3.
•
Sensors correctly connected