Loop Leader PD6620 Series Loop-Powered Flow Rate/Totalizers
Instruction Manual
34
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 disabled to display negative
values.
Noise 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 determines the length of time
over which the signal is averaged. The filter level can
be set between 1 and 16 seconds or turned off. The
higher the filter level, the longer the averaging time
and so the longer it takes the display to settle to its
final value. Setting the filter level to off disables the
filter function.
Noise Filter Bypass (
BYPAS
)
The noise filter bypass changes the behavior of the
meter so that small variations in the signal are filtered
out but large abrupt changes in the input signal are
displayed immediately. The bypass value determines
the minimum amount of signal change to be displayed
immediately. All signal changes smaller than the by-
pass value are filtered or averaged by the meter. The
noise filter bypass may be set between 0.0 and 99.9%
of full scale.
Enabling Password Protection (
PASSWRD
)
The
Password
menu is used for programming security
to prevent unauthorized changes to the programmed
parameter settings. There are three password types
available:
Main
,
Total
, and
Grand
Total
. The
Main
password prevents access to the meter
Programming
Mode
.
Total
and
Grand
Total
passwords prevent re-
setting of and changes to the total and grand total, re-
spectively.
To set a password, enter the
Password
menu and
program a five-digit password. When the
Main
pass-
word has been enabled, the lock icon will display in
the lower right of the display (PD6622/26 only).
For instructions on how to program numeric values
see
Making Changes to a Password
Protected Meter
If the
Main
password is enabled, the meter will display
the message
LOCKED
when the
Menu
button is
pressed. If the
Total
or
Grand Total
passwords are
enabled, the meter will display the message
LOCKED
when trying to reset or change the total or grand total.
Press the
Enter
button while the message is being
displayed and enter the correct password to gain
access to the menu. After exiting
Programming Mode
,
the meter returns to its password protected condition.
Disabling Password Protection
To disable the
Main, Total, or Grand Total
passwords,
access the
Password
menu and clear the desired
password either by pressing and holding the
Right
Arrow
button until all digits reset to zero or manually
changing all of the digits to zero. When the
Enter
button is pressed, the meter will display
UNLOCKED
and will no longer require a password to access
Programming Mode
, or a password to reset or change
the total or grand total, depending on which password
was cleared.
Note:
If the meter is password protected and the
password has been forgotten, the password may be
overridden using the master password:
50865
Programmable Function Keys User Menu
(
USER
)
The
User
menu allows the user to assign the front
panel function keys F1, F2, and F3, and the digital in-
put (a digital input located on the input signal con-
nector) to access some of the menus or to activate
certain functions immediately (e.g. reset max & min,
hold relay states, etc.). This allows the meter to be
greatly customized for use in specialized applications.
LOCKED
PASSWRD
PASS
MAIN
LOCK
00000
LOCK
12345
Enter Numeric
Password
PASSWRD
Flashes
Momentarily
USER
USER
F1
USER
F2
USER
F3
USER
DI
USER
HINT
F1
DISP FN
F1
MENU FN
F1
TIMER.FN
F1
BATCH.FN
F1
HOLD FN
F1
RST FN
F1
DISABLE
HINT
OFF
HINT
ON
F1
ALARM.FN
