Loop Leader PD6620 Series Loop-Powered Rate/Totalizer Instruction Manual
42
Low-Flow Cutoff (
CUTOFF
)
The low-flow cutoff feature allows the meter to be programmed so that the output from a flowmeter always
displays zero on the meter at low flow rates.
The cutoff value may be programmed from 0 to 999999.9. The meter will display zero below the cutoff
value. The cutoff may also 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
bypass 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 pro-
grammed 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 resetting of and changes to the total and grand total, respectively.
In order to set a password, enter the
Password
menu and program a five-digit password. When the
Main
password 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
Setting Numeric Values
, page 23.
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
LOCKED
PASSWRD
PASS
MAIN
LOCK
00000
LOCK
12345
Enter Numeric
Password
PASSWRD
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