Emerson 308014EN Manuel D’Utilisation

Chapter 12 Sensor Installation

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:

where L

 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.

wls_open_below_v3.eps

wls_open_zero_v2.eps