DataLoop™ LI23 Loop-Powered Process Meter
Instruction Manual
MN302100 Rev 3
39
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 0.1 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.
In order to set a password, enter the
Password
menu and program a five-digit password.
For instructions on how to program numeric values see
Setting Numeric Values
, page 18.
Making Changes to a Password Protected Meter
If the meter is password protected, the meter will display the message
LOCKED
when the
Menu
button is
pressed. 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 password protection, access the
Password
menu and clear the entered 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 re-
quire a password to access
Programming Mode
.
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
Flashes
Momentarily
