INSTALLATION
SETUP AND PHYSICAL INSTALLATION
3 - 10
WBPEEUI110504A0
(Fig.
). The calculations are the same as those for an open
tank level measurement.
1. Refer to Figure
for a typical piping arrangement for
closed tank level measurements in noncondensing
atmospheres.
2. Make the connection from the lower tap of the tank to the +
(high pressure) side of the transmitter.
3. Make the connection from the upper tap of the tank to the
- (low pressure) side of the transmitter.
4. Observe the conventions outlined in Figure
.
5. The output of the transmitter is proportional to the level of
the liquid above the cell times the specific gravity of the liquid.
If the zero point of the desired level range is above the cell, the
lower range value must be changed to reflect this. Refer to
Figure 3-5. Open Tank Level Measurement
T0 2219A
20
15
10
5
0
-250
(-62.2)
D IF F E R E N T IA L P R E S S U R E
IN . H O (kPa )
2
O U T P U T m A
+ 250
(+62.2)
4
S PA N = (h – h ) x S G
2
1
Z E R O
S U P P R E S S IO N
= h x S G
1
+
–
h
2
h – h
2
1
h
1
Содержание Platinum standard Series
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