PD663 Explosion-Proof Loop-Powered Meter
Instruction Manual
11
Signal Input Conditioning
Function (
Fnc
)
The PD663 provides linear and square root signal
input conditioning functions for inputs from linear and
non-linear transmitters.
Linear (
Lnr
)
Meters are set up at the factory for linear function
using two-point linearization. Multi-point linearization
with up to 32 points may be used. The linear function
provides a display that is linear with respect to the
input signal between each set of input points.
Square Root (
sqr
)
The square root function is used to linearize the signal
from a differential pressure transmitter and display
flow rate in engineering units.
Information Menu (
info
)
The
Information
menu is located in the
Advanced
see, page
It shows software identification number, version
number, and calibration temperatures. To determine
the software version of a meter:
Go to the
Information
menu (
info
) and press
Enter
button.
The meter will automatically scroll through the
software release number and software version. The
meter temperatures at the time of last internal
calibration in
°
C and
°
F are displayed for calibration
troubleshooting. Pressing the
Enter
,
Right
, or
Up
buttons will progress the information display.
Following the information display, the meter will exit
the
Advanced
features menu and return to run mode.
Input Signal Filter (
FIL
)
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
), 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
)
There is
no need to recalibrate
the meter for
milliamps when first received from the factory.
The meter is
factory calibrated
for milliamps prior
to shipment. The calibration equipment is traceable
to NIST standards.
The internal calibration allows the user to scale the
meter without applying a signal. The use of a
calibrated signal source is necessary to perform the
internal calibration of the meter. Check calibration of
the meter at least every 12 months.
Notes:
The signal source must have a full-scale accuracy
of 0.01% or better between 4 and 20 mA in order
to maintain the specified accuracy of the meter.
Allow the meter to warm up for at least 15 minutes
before performing the internal calibration
procedure.
The
Internal
calibration
menu is part of the
Advanced
features menu.
Press and hold the
Menu
button for 5 seconds to
enter the
Advanced
features menu. Press the
Up
arrow button to scroll to the
Internal Calibration
menu
(
ICAL
) and press
Enter
.
The meter displays
4.00
mA. Apply a 4.00 mA signal
and press
Enter
. The display flashes for a moment
while the meter is accepting the signal.
After the signal is accepted, the meter displays
20.00
mA. Apply a 20.00 mA signal and press
Enter
. The
display flashes for a moment while the meter is
accepting the signal.
Error Message (
Err
)
An error message indicates that the calibration
process was not successful. After the error message
is displayed, the meter will revert to input 2 calibration
settings. The error message might be caused by
inadvertently leaving the signal at the previous level
or not maintaining a 0.40 mA minimum span. Press
the Menu button to cancel the current calibration
process if necessary.
