BEKA BA334NG, Руководство пользователя

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8. CONFIGURATION EXAMPLE
In this example a BA334NG Rate Totaliser is
connected to a turbine flowmeter having a K-factor
of 105 pulses per litre with a magnetic pick-off.
The BA334NG 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 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 totalisation 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
8.1 Configuration procedure
The BA334NG Rate Totaliser may be configured on-
site without disconnection from the power supply or
from the flowmeter.
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 lineariser 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
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
existing input. The Rate Totaliser is
required to work with a magnetic pick-off
therefore 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
pulse edge 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
prompt in the
configuration menu by pressing the
)
button twice. 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 Upper display
Using the
& 
or
 *
button select
di5P-1
in the configuration menu and
press
(
to select whether flow rate or
total flow 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 display.
Therefore using the
& 
or
 *
button
select
totAL
and press
)
to enter the
selection and return to the
di5P-1
prompt in the configuration menu.
See 6.9
Step 6 Lower display
Using the
&

or

*
button select
di5P-2
in the configuration menu and
press
(
which will show if the lower
display is
on
or
oFF
. The Rate Totaliser
is required to display both total flow and
the rate of flow so the lower display is
required. Using the
&

or

*
button
select
on
and press
)
to enter the
selection and return to the
di5P-2
prompt in the configuration menu.
See 6.10
Step 7 Position rate & total decimal points
Select
dP
from the configuration menu
and press
(
. The upper display
already defined as the total display by
function
di5P-1
will be activated and
identified by the Total annunciator.
Using the
&
or
*
push button
position the decimal point in front of the
second least significant digit to give a
total display resolution of
0 . 00
.
Pressing the
(
button will show the
rate display, but in the upper display
position with the Rate annunciator
activated. Using the
&
or
*
push
button position the decimal point to the
right of the least significant digit so that
it is not visible to give a total display
resolution of 1. Finally press the
)
button to enter the selections and return
to the
dP
prompt in the configuration
menu. See 6.11