Rosemount 2240S, Справочное руководство

Страница: 52 / 100

Reference Manual
300550EN, Rev AA
December 2010
Rosemount 2240S
5-10
Section 5. Configuration/Operation
Configuration Examples
The configuration of the WLS can basically be divided into three cases as
illustrated below:
Table 5-2. WLS configuration
The Water Zero Level is below the Tank
Zero Level.
In this case the Lower Sensor Limit (0%)
on the WLS is below the Tank Zero Level.
Note that when the Lower Sensor Limit
(0%) is below the Tank Zero Level this
results in X<0.
Example:
L
A
=500 mm, X= -50 mm.
LSL (0%)= -50 mm.
USL(100%) = 500 + (-50)=450 mm.
The Water Zero Level is equal to the Tank
Zero Level.
In this case the Lower Sensor Limit (0%) on
the WLS corresponds to the Tank Zero
Level.
Example:
L
A
=500 mm, X=0 mm.
LSL (0%) = 0 mm.
USL (100%) = 500 mm.
The Water Zero Level is above the Tank
Zero Level.
In this case the Lower Sensor Limit (0%)
on the WLS is above the Tank Zero Level.
Note that when the Lower Sensor Limit
(0%) is above the tank Zero Level this
results in X>0.
Example:
L
A
=500 mm, X=70 mm.
LSL (0%) = 70 mm.
USL (100%)= 500 + 70=570 mm.
Tank Zero
Level
Water Zero
Level
X<0
100%
0%
Tank Zero
Level
100%
0%
Water Zero
Level
X=0
Water Zero
Level
X>0
Tank Zero
Level
100%
0%