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8-28
STRAIN
0
8
Scaling to
Display
Engineering
Units
Figure 8-7. S3 and S4 Main Board Jumper Positions
DISPLAY
BD
C
B
A
S3
SIGNAL INPUT BD
MAIN BD
J9
J2
J1
J3
AC POWER BD
W1
W3
W2
S4
A
T1
B
C
R38
J10
(FACTORY CONFIGURED)
8.4 CURRENT INPUT, PROGRAMMING THE METER FOR A
DESIRED DISPLAY
An easy way to program your unit is to follow the example and step by
step procedure below and just modify it for your exact requirements.
EXAMPLE: An end user wants to scale the meter for a 5000 PSI,
4-20 mA current output, pressure transmitter. He wants the meter
to display in tenths of a PSI from 0 to 5000.0 PSI. The pressure
sensor requires 12-30 Vdc excitation power.
The two most common methods of scaling, Method I scaling without
simulating a known load, and Method II scaling by simulating known
loads will be demonstrated. Sometimes end users simulate known
currents instead of known physical standards (pressures), which is
covered in Method II. A third method, Method III, is for a unique
case where you are scaling with a known load and you want the
display to have 3 or more decimal places. Method III is a little
complicated and should only be used, if you are looking for really
accurate results and you desire a display with 3 or more places to the
right of the decimal point.
A. Set the correct jumpers on the meter. (Refer to Section 6 for
additional information.) Install jumpers S3A & S3C and S4B
on the main board.
B
Содержание DP461-S
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