Emerson 00809-0100-4102 manual DP Level Example, DP Flow example

Reference Manual	Section 2: Configuration
00809-0100-4102, Rev AA	May 2013

a.When configuring for level applications, select Linear under Select Scaled data options.

b.When configuring for flow applications, select Square Root under Select Scaled data options.

DP Level Example

Figure 2-3. Example tank

A

B

D

H L

C

A. 230 in.

B. 200 in.

C. 12 in.

D. 0.94 sg

A differential transmitter is used in a level application. Once installed on an empty tank and taps vented, the process variable reading is -209.4 inH2O. The process variable reading is the head pressure created by fill fluid in the capillary. Based on Table 2-2 on page 2-17, the Scaled Variable configuration would be as follows:

Table 2-2. Scaled Variable Configuration for Tank Application

Scaled Variable units:	inch
Scaled data options:	linear
Pressure value position 1:	0 inH2O
Scaled Variable position 1:	12 in.
Pressure value position 2:	188 inH2O
Scaled Variable position 2:	212 in.
Linear offset:	-209.4 inH2O

DP Flow example

	A differential pressure 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
Configuration	application, the flow rate at full scale flow is 20,000 gallons of water per hour. It is highly	17