Open Tank Level Measurement - ABB Platinum standard Series Product Instruction

INSTALLATION
SETUP AND PHYSICAL INSTALLATION
3 - 10
(Fig. 3-7). The calculations are the same as those for an open
tank level measurement.
O U T P U T m A
4
-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 )
Figure 3-5. Open Tank Level Measurement
1. Refer to Figure 3-8
closed tank level
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 3-8.
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
h – h
2 1
h
2
h
1
20
ZE R O
15
S U P P R E S S IO N
= h x S G
1
10
S PA N = (h – h ) x S G
5
+250
(+62.2)
0
2
for a typical piping arrangement for
measurements in
+ –
2 1
T0 2219A
noncondensing
WBPEEUI110504A0