Precision Digital Corporation ProtEX-MAX PD8-6300, Инструкция по эксплуатации

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PD8-6300 Pulse Input Rate/Totalizer, Counter & Tachometer
Instruction Manual
11
Rate/Totalizer Features
ProtEX-MAX flow rate/totalizers can be programmed
for a wide variety of rate and totalizer applications.
They can display rate, total, grand total, or a
non-resettable grand total with a time base of
seconds, minutes, hours or days. The user can
program a totalizer conversion factor, a non-resettable
grand total, password protection, and several total
reset methods. The dual-line display can be
programmed to display rate and total at the same
time, or a variety of other rate, total and grand total
combinations.
Display Rate & Total at Same Time
One of the most useful features of the ProtEX-MAX
flow rate/totalizers is their ability to display both flow
rate and total at the same time. Whereas a single-line
display would have to toggle between the rate and the
total, the ProtEX-
MAX’s dual-line display can display
them both at the same time.
Totalizer Password Protection
The total and grand total can be password protected
so they can be reset only by authorized personnel.
Total Password Grand Total Password
Non-Resettable Grand Total
The user can set up the grand total to be
non-resettable by entering a specific password.
Once this is done, the grand total can never be reset.
Totalizer Conversion Factor
The user can enter a totalizer conversion factor that
allows the meter to display total in different units than
the rate. For instance, a customer could measure flow
rate in gallons per minute and total in hundredths of
acre-feet.
Rate in Units Per Sec, Min, Hr, or Day
The user may select a rate time base in units per
second, minute, hour, or day. The time base is the
amount of time over which the rate parameter will
totalize. For example, if the rate was ten (and stayed
constant for one minute) and the time base was in
minutes, then the total would increase by ten every
one minute.
Convert Pulse Input to Isolated
4-20 mA Output
One of the most useful applications for the PD8-6300
is to convert the pulse input from the flowmeter into
an isolated 4-20 mA output all the while displaying
flow rate and total on a big bright display as the
following graphic illustrates:
Programming
The meter may either be scaled (
SCALE
) without
applying an input, calibrated (
Cal
) by applying an
input, or the K-Factor menu may be used to match the
rate/totalizer with the flowmeter’s k-factor (pulse/unit
of measure).
Most flowmeter manufacturers provide the k-factor
information with the flowmeter. Enter the K-Factor
(
Factor
) menu and select the decimal point with
highest resolution possible and program the k-factor
value (i.e. pulses/gal). The meter will automatically
calculate the flow rate using the k-factor and the time
base selected.
Gate Function for Slow Pulse Rates
The gate function is used for displaying slow pulse
rates. Using the programmable gate, the meter is able
to display pulse rates as slow as 1 pulse every 999.9
seconds (0.001 Hz). The gate function can also be
used to obtain a steady display reading with a
fluctuating input signal.
Total & Rate Alarms
The ProtEX-MAX can be equipped with four alarms
(relays) that can be set up to activate on the rate or
total. In the case of the rate, the relays can be
programmed to trip on a high or low rate. In the case
of the total, the relays can be programmed to trip
when the total reaches a user-defined set point. A
variety of reset modes are available and the user can
also program time delays and fail-safe operation.
4-20 mA Output for Rate or Total
The 4-20 mA output can be assigned to the rate or
total.
Total Stored in Non-Volatile Memory
Total and Grand Total values, and all programmed
settings are stored in non-volatile memory for a
minimum of ten years if power is lost.