FW-N410-P-M_v0203_01_EN
Page 28
cubic feet. The more accurate the K-factor, the more accurate the
functioning of the system will be.
Example 1: Calculating the K-factor.
The flowmeter generates 2.4813 pulses per liter and the selected unit is m
3
. A
cubic meter consists of 1000 liter which gives 2.4813 pulses*1000 liter=2481.3
pulses per m
3
. So, the K-Factor is 2481.3. Enter for the Flowmeter K-Factor:
24813 and for the flowmeter K-Factor decimals: 1.
Example 2: Calculating the K-factor.
The flowmeter generates 6.5231 pulses per gallon and the selected engineering
unit is gallons. So, the K-Factor is 6.5231. Enter for the Flowmeter K-Factor:
65231 and for the Flowmeter K-Factor decimals: 4
.
The N410-P calculates automatically the internal K-Factors for selected
measuring units for PRESET (SETUP 1.1) and Flowrate (SETUP 3.1).
4.2.9.
EXPLANATION OF SETUP 7 - CONTROL
Two mechanical control outputs are available to control relays or valves.
RELAY 1
is always used
as the main batch control relay, its function is fixed and cannot be charged.
The second relay as well as the transistor output can be used for the desired function:
•
Batch: the function is equal to relay 1.
•
Preclose: used for two-stage control.
•
Alarm: in case of a no flow alarm
•
Pulse: for use as a scaled pulse output.
BATCH RELAY 2
7.1
Function according to:
Off, batch, preclose, alarm, pulse
BATCH TRANS 1
7.2
Function according to:
Off, batch, preclose, alarm, pulse
PRECLOSE QUANTITY
7.3
According to the setting “Preclose”, the switch-off moment of the output is
based on the remaining quantity before the end of batch. With value zero
(0), this function is disabled.
WIDTH (PULSE)
7.4
The pulse width determines the time that the output will be switched; in
other words the pulse length. This pulse length determines also the
maximum frequency based on a 50/50 duty cycle.
1 .
Maximum frequency = 2*pulse length (in seconds)
The pulse width is set in milliseconds in the range 0.001 - 9.999 sec.
Value “zero” disables the pulse output.
If the frequency should go out of range - when the flowrate increases for
example - an internal buffer will be used to "store the missed pulses": As
soon as the flowrate slows down, the buffer will be "emptied".
It might be that pulses will be missed due to a buffer-overflow, so it is
advised to program this setting within its range!
AMOUNT
7.5
A pulse will be generated every time a certain quantity is added to the
total (preset). Enter this quantity here while taking the displayed decimal
position and measuring unit into account (according to PRESET).
PULSE
7.6
With this function, it is determined if a pulse will be generated according to
the quantity batched or according to accumulated total.
With
setting “batch” the pulse generator will be set to zero when a new
batch is started and does not reflect the complete totalized volume.
