Emerson Rosemount 5900S Reference Manual page 121

Reference Manual
00809-0100-5900
Calibrate
Prerequisites
Ensure that there is no liquid above the calibration ring
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 5900S 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 5900S from the Gauge Reference
2. Right-click the device icon and select the Properties → Geometry tab.
(10) See LPG/LNG antenna requirements.
(11) See Tank geometry.
Rosemount 5900S Radar Level Gauge
(11)
Point to the calibration ring.
This is referred to as the Ullage
• 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.
(10)
at the end of the still-pipe when
(11)
value defined by: Ullage = R - L, where
Configuration
September 2019
121