PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
62
Low-Flow Cutoff (
CUTOFF
)
The low-flow cutoff feature allows the meter to be programmed so that the often-unsteady output from a differential
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 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 programmed
parameter settings or undesired resetting of the total or grand total. There are three separate passwords available
that can be set independently of each other:
Main
,
Total
, and
Grand Total
. The
Main, Total,
and
Grand Total
passwords prevent access to the meter
Programming
Mode
.
Total
and
Grand
Total
passwords prevent resetting of
the total and grand total, respectively.
To set a password, enter the
Password
menu and program a five-digit password.
For instructions on how to program numeric values see
LOCKED
LOCK
00000
LOCK
12345
Enter
Numeric
Password
PASSWRD
Flashes
Momentarily
PASSWRD
ENTER
F3
MENU
ENTER
F3
ENTER
F3
PASS
MAIN
F2
F1
PASS
TOTAL
F2
F1
PASS
GTOTAL
