21
Reference Manual
00809-0200-4802, Rev BA
Section 2: Configuration
May 2013
Configuration
DP Level example
Figure 2-3. Example tank
A differential transmitter is used in a level application where the span is 188 inH
2
O (200 in. *
0.94 sg). Once installed on an empty tank and taps vented, the process variable reading is
-209.4 inH
2
O. The process variable reading is the head pressure created by fill fluid in the
capillary. Based on Figure 2-3, the Scaled Variable configuration would be as follows:
DP Flow Example
A differential transmitter is used in conjunction with an orifice plate in a flow application where
the differential pressure at full scale flow is 125 inH2O. In this particular application, the flow
rate at full scale flow is 20,000 gallons of water per hour. It is highly recommended to use the
low flow cutoff function in order to have a stable output and avoid problems due to process
noise at a low flow or no flow condition. A low flow cutoff value that is practical for the flow
element in the application should be entered. In this particular example, the low flow cutoff
Scaled Variable units: inches
Scaled data options: linear
Pressure value position 1: 0 inH
2
O (0 mbar)
Scaled Variable position 1: 12 in. (305 mm)
Pressure value position 2: 188 inH
2
O (0.47 bar)
Scaled Variable position 2: 212 in.(5385 mm)
Linear offset: -209.4 inH
2
O (-0.52 bar)
20 mA
4 mA
230 in.
200 in.
0.94 sg
12 in.
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