PD6770 Field-Mount Loop-Powered Process Meter
Instruction Manual
9
Setup
Overview
Setting the 4-20 mA input for the desired display is
done using a calibrated 4-20 mA signal source and
the four potentiometers located on the front of the dis-
play module. The cover must be removed to access
these potentiometers. There is also a jumper array for
setting the decimal point.
Scaling Controls and Display
Control
Description
LO
4 mA display adjust.
LO FINE
4 mA precision display adjust.
HI
20 mA display adjust.
HI FINE
20 mA precision display adjust.
Setting Up the Meter
Setting the Decimal Point
A decimal point may be set using a three-position
jumper array located on the rear of the display
module. To access the jumper array, unscrew the
two captive screws that fasten the display module.
Remove the display module and place the jumper on
the desired pins as indicated on the board for decimal
point locations of D.DDD, DD.DD, DDD.D, or remove
it if no decimal point is desired.
Minimum & Maximum Input Span
A minimum input span of 20 counts is required be-
tween the 4 mA and 20 mA inputs. A maximum input
span of 2000 counts may be setup between the 4 mA
and 20 mA input.
The meter will not calibrate properly if these minimum
and maximum span ranges are not maintained during
scaling.
Calibrating the Meter
The meter is provided factory calibrated to display
-50.0 at 4 mA and 150.0 at 20 mA.
Apply a 4 mA signal and adjust the LO potentiometers
(coarse and fine) to display the desired reading. Apply
a signal between 16 and 20 mA and adjust the HI po-
tentiometers (coarse and fine) to display the desired
reading. Complete the calibration procedure by mak-
ing minor adjustments to the LO and HI fine potenti-
ometers as necessary.
