Emerson Rosemount 5900C, Reference Manual

Page: 143 / 322

Calibrate
Prerequisites
Ensure that there is no liquid above the calibration ring
(10)
at the end of the still-pipe when
calibrating the gauge. Then the calibration ring is the only object that will be detected by
the gauge. The product level presented by the Rosemount 5900C will be equal to the
position of the calibration ring measured from the Zero Level near the bottom of the tank.
Procedure
1. Check the distance measured by the Rosemount 5900C from the Gauge Reference
Point
(11)
to the calibration ring.
This is referred to as the Ullage
(11)
value defined by: Ullage = R - L, where
•
R
is the tank height measured from the Tank Reference Point to the Zero Level.
For LPG tanks the calibration ring is used as Zero Level and the Tank Reference
Point is equal to the Gauge Reference Point.
• L is the product level measured from the Zero Level.
If the Ullage value is not equal to the actual distance between the Gauge Reference
Point
and the calibration ring, you will need to adjust the
Calibration Distance
parameter.
2. Right-click the device icon and select the Properties
→
Geometry tab.
(10) See LPG/LNG antenna requirements .
(11) See Tank geometry .
Reference Manual Configuration
00809-0100-5901 September 2019
Rosemount 5900C Radar Level Gauge 143