Display Scaling - Automation Direct ProSense DPM2 Series User Manual

User Manual - DPM2 Series Process Panel Meters

Display Scaling

Display scaling is necessary when adapting display reading to a particular engineering unit.
Display range can be configured between -9999 and 9999 for the DPM2 or -1999 to 9999
for the DPM2L.
Display scaling is a linear process that consists in introducing two input values, referred as
Input 1 and Input 2, and their respective display values, referred as Display 1 and Display 2.
On the basis of this proportional relationship internal software calculates display value that
would correspond to a given input value. Decimal point position is selectable and completes the
engineering units indication configuration.
It is possible to scale display in an direct acting (increasing) or reverse acting (decreasing)
proportional mode depending on whether the second display value (DISP.2) is greater or less
than the first (DISP.1). In an increasing mode, display value increases proportionally to the
input value whereas in a decreasing mode, display value decreases.
Direct acting (increasing)
proportional mode
DISPLAY 2
DISPLAY 1
IMPORTANT IN "tEAC" MODE:
To ensure the best accuracy, both points 1 and 2 should represent extreme process limits.
The figure below shows an example for a 10 bar pressure sensor with a 4-20mA output signal.
Decimal point is situated between second and third digit of the display.
DISP.2
(10.00)
DISP.1
(00.00)
16
DISPLAY 1
DISPLAY 2
INPUT 1 INPUT 2
INP.1 INP.2
(04.00) (20.00)
DPM2 Process User Manual, 1st Edition
Reverse acting (decreasing)
proportional mode
INPUT 1 INPUT 2