Emerson 4500 사용자 설명서

Reference Manual

00809-0100-4027, Rev AA

December 2005

Rosemount 4500

3-16

HART Communicator

To configure the scaled variable with a HART Communicator, perform the 
following procedure:

1. From the HOME screen follow the fast key sequence for “Scaled 

Variable Configuration.”

2. Select OK after the control loop is set to manual.

3. Enter the scaled variable units. 

a. Units can be up to six characters long and include A — Z, 0 — 9, -, 

/,%, and *.

b. The first character is always an asterisk (*), which identifies the units 

displayed are scaled variable units.

4. Select the Linear Function, which will prompt for two data points.

5. Enter pressure value position 1. Pressure values must be within the 

range of the transmitter. Enter the lower known value point considering 
any linear offset.

6. Enter scaled variable position 1. Enter the lower known value point; this 

value must be no longer than seven digits.

7. Enter pressure value position 2. Pressure values must be within the 

range of the transmitter.

a. Enter the upper known value point.

8. Enter scaled variable position 2.

a. Enter custom unit equivalent to the upper known value point; this 

value must be no longer than seven digits.

9. Enter linear offset.

10. Select OK to acknowledge that the loop can be returned to automatic 

control.