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12-7
Rosemount Tank Radar REX
Chapter 12 Sensor Installation
Installation Manual
308014EN, Edition 4
May 2013
For inventory management with TankMaster WinOpi the WLS is
configured in TankMaster WinSetup.
The Lower Range Value (4 mA) and the Upper Range Value (20 mA) are
given by the following formulas:
Upper Range Value (20 mA) = L
A
+ X
Lower Range Value (4 mA) = X
where L
A
is the active length of the Water Level Sensor, and X is the
distance between the Water Zero Level and the Tank Zero Level.
The configuration of the WLS can basically be divided into three cases
as illustrated below:
The Water Zero Level is below the
Tank Zero Level.
In this case the 4 mA point on the
WLS is below the Tank Zero Level.
Note that when the 4 mA point is
below the Tank Zero Level the 4 mA
value is negative, i.e. X<0.
Example: L
A
=500 mm, X=-50 mm.
4 mA value=-50 mm.
20 mA value=500 + (-50)=450 mm.
The Water Zero Level is equal to
the Tank Zero Level.
In this case the 4 mA point on the
WLS corresponds to the Tank Zero
Level. The 4 mA value=0.
Example: L
A
=500 mm, X=0 mm.
4 mA value=0 mm.
20 mA value=500 mm.
Water Zero
Level
X<0
wls_open_below_v3.eps
Tank Zero
Level
20 mA
4 mA
wls_open_zero_v2.eps
Tank Zero
Level
Water Zero
Level
20 mA
4 mA