PRECISION DIGITAL PD6720 Series, Instruction Manual

Page: 15 / 25

PD6720 Field-Mount Loop-Powered Rate/Totalizer
Instruction Manual
15
Calibrating the Meter ( Cal )
To scale the meter without a signal source
refer to
Scaling the Meter (
SCale
).
The meter can be calibrated to display the process in
engineering units by applying the appropriate input
signal and following the calibration procedure.
The use of a calibrated signal source is strongly
recommended.
1. Press the Up arrow button to scroll to the
Calibration menu (
CAL
) and press Enter .
2. The meter displays
Inpt1
. Apply a known
signal and press Enter .
The display will flash while accepting the
signal.
3. After the signal is accepted, the meter displays
dspl1 Press Enter .
Enter a corresponding display value for the
signal input, and press
Enter to accept.
4. The meter displays Inpt2 . Apply a known
signal and press Enter .
The display will flash while accepting the
signal.
5. After the signal is accepted, the meter displays
dspl2 . Press Enter .
Enter a corresponding display value for the
signal input and press
Enter to accept.
After completing calibration the save? display will
need to be acknowledged using the Enter key before
calibration will take effect.
Minimum Input Span
The minimum input span is the minimum difference
between input 1 and input 2 signals required to
complete the calibration or scaling of the meter.
The minimum span is 0.10 mA.
If the minimum span is not maintained, the meter
reverts to input 2, allowing the appropriate input
signals to be applied.
Re-Calibrating the Internal
Calibration Reference (
ICaL )
The Internal Calibration (
ICAL
) menu, located in the
Advanced features menu, is used to recalibrate the
internal calibration reference. Recalibration is
recommended at least every twelve months. Refer to
Input Signal Filter
( FILTER )
The noise filter is available for unusually noisy signals
that cause an unstable process variable display. The
noise filter averages the input signal over a certain
period. The filter level can be set to low (
LO
), medium
(
med
), high (
HI
), or off (
OFF
). The higher the filter
setting, the longer the averaging time and so the
longer the display may take to find its final value.
The filter contains a noise filter bypass feature so that
while small variations in the signal will be filtered out,
large, abrupt changes to the input signal are
displayed immediately.
Internal Calibration (
ICAL
) page 21 for instructions.
Setting the Time Base (
t.base
)
The meter calculates total based on rate and a time
base of units per second, minute, hour, or day.
Press the Enter button, at any time, to accept a
setting or Menu button to exit without saving changes.
Setting the Total Conversion Factor
(
totCF
)
Total Conversion Factor is used to convert to a
different unit of total display. For example, to display