PD6600 Series Loop-Powered Process Meters
Instruction Manual
41
Advanced Scaling and
Calibration (
SCALE.CAL
)
This menu offers options to scale or calibrate the
meter.
Scaling the Input (
SCALE
)
The scale menu in the
Advanced
menu is the same
as the scale menu in the
Input
) on page
scaling the meter.
Calibrating the Input (
CAL
)
To scale the meter without a signal source, refer to
), page
The meter can be calibrated to display the process in
engineering units by applying the appropriate input
signal and following the calibration procedure. The
CAL
menu can be used either with a calibrated
current source or with a live signal coming from a
4-20 mA transmitter connected to the process being
measured.
During calibration, the mA input value will be
displayed as
INP 1
and
INP 2
. Adjust the input
source until the desired mA value is shown.
The use of a calibrated signal source is required.
Follow these steps to calibrate the input:
1. After accessing the
SCALE.CAL
menu, press
the
Right-Arrow
button to scroll to the
Calibration
menu (
CAL PV
) and press
Enter
.
2.
Select the appropriate units for the desired
process variable, then press
Enter
. For
4. The meter displays
INP 1
. Apply a known
signal and press
Enter
. The display will flash
while accepting the signal.
5. After the signal is accepted, the meter displays
DSP 1
. Enter a corresponding display value
for the input signal, and press
Enter
to accept.
6. The meter displays
INP 2
. Apply a known
signal and press
Enter
. The display will flash
while accepting the signal.
7. After the signal is accepted, the meter displays
DSP 2
. Enter a corresponding display value
for the input signal and press
Enter
to accept.
8. After completing calibration, the
SAVE?
display
will need to be acknowledged using the
Enter
key before calibration will take effect.
Low-Flow Cutoff (
CUTOFF
)
The low-flow cutoff feature allows the meter to be pro-
grammed so that the often-unsteady output from a dif-
ferential pressure transmitter at low flow rates always
displays zero on the meter. The cutoff value may be
programmed from 0.1 to 99999. The meter will display
zero below the cutoff value. The cutoff can be disa-
bled to display negative values.
PV
SCALE.CAL
CAL
UNITS
UNITS
VOLUME
UNIT
GAL
DSP 1
GAL
Flashes
Units
SCALE
PV
CAL
PV
INP 1
04.000 mA
DSP 1
+00,000.00
DSP 2
GAL
Flashes
Units
INP 2
20.000 mA
DSP 2
+00,100.00
SAVE?
Note:
The
SAVE?
prompt is not displayed
if
no changes have been made to the scaling.
