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9. CONFIGURATION EXAMPLE
In this example a BA384NG Rate Totaliser is
required to display the total flow rate and the sum of
the total flow 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 BA384NG 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 BA384NG 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.
Using the
&
or
*
button select
dEbouncE
from the sub-menu and press
(
. Using the
&
or
*
button select
dEFAuLt
which will provide moderate
noise protection. If the Rate Totaliser is
subsequently found to miscount the
noise rejection can be increased. Enter
the selection and return to the
inPut-A
prompt in the configuration menu by
pressing the
)
button twice.
As both flowmeters are the same repeat
for input b using the
inPut-b
function.
See 6.6 and 6.7
Step 4
Select the interval between display
updates.
Using the
&
or
*
button select
uPdAtE
in the configuration menu and press
(
to reveal how frequently the Rate
Totaliser display is updated. Using the
&
or
*
push button select
0
.
5
(0.5
seconds i.e. 2 display updates per
second). Enter the selection and return
to the
uPdAtE
prompt in the configuration
menu by pressing the
)
button.
See 6.8
Step 5
Count
Using the
&
or
*
button select
Count
in the configuration menu and press
(
to reveal the existing arithmetic
relationship between input A and input b.
In this example the Rate Totaliser is
required to display the sum of the two
inputs, therefore using the
&
or
*
push button select
A
:
b
. Enter the
selection and return to the
Count
prompt
in the configuration menu by pressing the
)
button.
See 6.9
Step 6
Upper display
Using the
&
or
*
button select
di5P-1
in the configuration menu and press
(
to select whether flow rate or flow
total is shown on the upper 8 digit
display. The required maximum total of
100000 with 0.01 resolution can only be
accommodated on the top eight digit
display. Using the
&
or
*
button select
totAL
and press
)
to enter the
selection and return to the
di5P-1
prompt in the configuration menu.
See 6.10
