BEKA BA384E, Manual

Page: 38 / 68

38
8.8 Output pulse width:
durAtion
When the output pulse is derived from the least
significant digit of the composite total, the output
pulse width in milliseconds is defined by this
function. One of 11 pulse widths may be selected:
0.1
0.5
1
2.5
5
10
25
50
100
250
500
Using the
&
or
*
push button select
durAtion
in
the pulse output sub-menu and press
(
to reveal
the existing pulse duration. The value can be
changed by pressing the
&
or
*
push button to
select the required value followed by the
)
button
to return to
durAtion
prompt.
Note: This function only appears in the pulse
output sub-menu when the output pulse is
derived from the least significant digit of the
total display.
8.9 Stored pulses
If the
diVidE
and
durAtion
functions are configured
such that the output pulse frequency with the
specified pulse width can not be output in real time,
the number of pulses will be stored and transmitted
at the maximum possible speed.
When total-A or total-b are reset to zero, any stored
pulses which have yet to be transmitted will be
discarded.
Stored pulses which have yet to be transmitted will
not be retained when the BA384G Rate Totaliser
power supply is interrupted.
9. CONFIGURATION EXAMPLE
In this example a BA384G Rate Totaliser is required
to display the total rate of flow, the total flow and the
sum of the flow rate and total in two pipes. Identical
flowmeters are fitted in each pipe which have a
K-factor of 105 pulses per litre with a magnetic pick-
off output.
The BA384G is required to display rate of flow in
imperial gallons per hour with a resolution of one
gallon and total flow in cubic metres with a maximum
total of 100000 and a resolution of 0.01 cubic
metres. Linearisation is not required. Totalisation is
to stop when the flow rate on each input falls below
10 gallons per hour. The display is to be updated
twice per second.
For this application the operator needs to reset the
total display to zero from the totalising mode, but
should not be able to reset the grand total. To
prevent tampering the instrument configuration
menu is to be protected by security code of 1209
9.1 Configuration procedure
The BA384G Rate Totaliser may be configured on-
site without disconnection from the power supply or
from the flowmeters.
Step 1 Enter the configuration menu
Enter the configuration menu by
simultaneously pressing
(
and
)
.
Assuming a security code has not
already been entered the instrument will
respond by displaying
FunCtion
which is
the first function in the configuration
menu.
See Fig 10.
Step 2 Select a linear function
With
FunCtion
displayed press
(
to
reveal the function of the Rate Totaliser.
Using the
&
or
*
button select
5td
to
switch off the linearisers and provide a
linear function. Press
)
to enter the
selection. See 6.4
Step 3 Select the type of input & debounce
Using the
&
or
*
button select
inPut-A
in the configuration menu and
press
(
which will reveal the sub-menu.
Again using the
&
or
*
button select
inP . TYPE
and press
(
to reveal the
current input. The Rate Totaliser is
required to work with a magnetic pick-off
so using the
&
or
*
button select
CoiL
followed by
)
to return to the
inP . tYPE
prompt in the sub-menu.