Emerson Rosemount 5900C, Reference Manual

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Tank Reference height (R)
The Tank Reference Height (R) is the distance from the hand dipping nozzle (Tank
Reference Point) to the Zero Level (Dipping Datum Plate) close to, or at the bottom of the
tank. For the Array Antenna with hinged hatch the reference point is located at the hand
dip plate as illustrated in
Figure 4-2 .
Gauge Reference distance (G)
The Gauge Reference Distance (G) is measured from the Gauge Reference Point to the
Tank Reference Point, which is located at the top surface of the customer’s flange or
manhole cover on which the level gauge is mounted as illustrated in
Figure 4-1 and Figure
4-3 .
For the hinged hatch version of the Rosemount 5900C with Array Antenna, the Tank
Reference Point and the Gauge Reference Point are located at the same position i.e. at the
hand-dip plate on the Still Pipe Gauge Stand as illustrated in
Figure 4-2 .
Set G=0 for the Rosemount 5900C with Array Antenna hinged hatch version when using
the hand dip plate as the Tank Reference Point (see
Figure 4-2 ).
G is positive if the Tank Reference Point is located above the Gauge Reference Point.
Otherwise G is negative.
Figure 4-3: Definition of Gauge Reference Distance
A
B
G>0
G<0
A. Tank Reference Point
B. Gauge Reference Point
Minimum Level Offset (C)
The Minimum Level Distance (C) is defined as the distance between the Zero Level
(Dipping Datum Point) and the Minimum Level of the product surface (tank bottom). By
specifying a C-distance, the measuring range can be extended to the bottom of the tank.
If C>0, negative level values will be displayed when the product surface is below the Zero
Level. Select the
Show negative level values as zero
check box in Rosemount TankMaster
WinSetup if you want levels below the Zero Level to be displayed as Level=0.
Measurements below the Zero Level will not be approved if the C-distance=0, i.e. the
Rosemount 5900C will report an invalid level.
Configuration Reference Manual
September 2019 00809-0100-5901
126 Reference Manual