Rockwell Automation EK-44750C Enwatch Unit - Manual (Page 20)

Rockwell Automation Publication GMSI10-IN001A-EN-P - May 2013
20 Enwatch Unit
Setting Up Sample Measurements
This section gives examples of setting up measurement definitions in the
Emonitor software.
DC or Other Numeric Measurements
Suppose you have a transducer with an output of -2 V to 2 V and a linear scale
from -10° F to 100° F. How do you set up the transducer in the Emonitor
software?
If the volts reading is R, then the data stored in the Emonitor software is:
(R / calibration + DC offset)
Input range volts: (X, Y)
Scale value: (A, B) volts
Data in the Emonitor software = (R - X) x ((B-A) / (Y-X)) + A
Calibration value in transducer setup: [(Y-X) x 1000mv / eu]/(B-A)
DC Offset in transducer setup: A - (B-A) x X / (Y-X)
1. In the Emonitor software, select Setup>Calibration and set up the
calibration for the Temperature transducer.
EXAMPLE Input range: (-1.31 V, +0.87 V)
Scale value: (100° F, 200° F)
Calibration: [(0.87 - (-1.31)) x 1000] / (200 - 100) = 21.8
Offset: 100 - (200 - 100) x (-1.31) / (0.87-(-1.31)) = 160.09
Input type should be DC coupled and the jumper setting on board needs to be set
as DC couple as well.