Emerson Rosemount 5900 Reference Manual page 86

Rosemount 5900 Series
4-12
Preliminary
6. When a Rosemount 2240 tank temperature multiplexer is used, the
vapor temperature is automatically mapped to the average temperature
of all spot sensors above the product surface. In case you like to map a
specific sensor, open the ATD Properties window and select the
Parameter Source tab to choose the desired temperature source device.
7. Configure the reference pins.
In the LPG Setup window click the Config Pins button to open the
LPG Configure Pins window:
Enter the reference pin position. The position is measured from the RTG
Reference Point to the actual position of the reference pin.
Since hand dipping can not be performed in high pressurized tanks, Emerson
Process Management / Rosemount Tank Gauging has developed a unique
method to verify level gauging in such tanks. The method is based on
measurements in a special radar wave propagation mode against a fixed
reference pin in order to verify the measurement.
NOTE!
The value entered in the Nominal Pos field refers to the mechanical distance
from the RTG reference point to the actual reference pin. This value will only
act as a starting point for the following verification process in which the
electrical distance from the RTG reference point to the reference pin is
calculated. In most cases the electrical distance deviates from the actual
mechanical distance.
Reference Manual
300520EN, Rev AA
November 2009
Section 4. Configuration