BEKA BA337E, Руководство пользователя

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the flowmeter produces per unit volume of flow e.g.
20 pulses per litre,
L-FACtor
therefore converts the
flowmeter output into engineering units ready for
further scaling to produce the required rate and total
flow displays.
To enter the flowmeter K-factor for one or more
segments, select
FACtor
in the configuration menu
and press
(
, which will reveal one of four sub-
functions. If
L-FACtor
is not displayed in the sub-
menu repeatedly press the
&
or
*
button to select
L-FACtor
followed by
(
to display the current
segment for which
L-FACtor
will be entered and the
total number of segments that have already been
defined using the
Add
and
dEL
functions.
The required segment, which is shown on the left
hand side of the display, can be selected using the
&
or
*
push button, see below.
When selected, press
(
which will reveal the current
L-FACtor
for the selected segment with one digit
flashing. The value of the flashing digit may be
changed by pressing the
&
or
*
button. When this
digit has been adjusted as required, pressing
(
will
transfer control to the next digit. When all the digits
have been adjusted pressing
(
will transfer control
to the decimal point that may be positioned between
any of the digits, or may be omitted by moving it to the
right of the least significant digit.
When
L-FACtor
for this lineariser segment is set as
required, press the
)
button to return to the segment
identification display from which the next segment
may be selected using
&
or
*
push button. When
L-FACtor
for all of the segments has been entered,
return to the
FACtor
prompt in the configuration menu
by operating the
)
push button twice.
7.7 Lineariser error message
If an attempt is made to position a segment at an input
frequency which is not greater than the frequency of
the preceding segment, or at an input frequency
which is not less than the frequency of the following
segment, the error message
value.err
will be
displayed.
8. CONFIGURATION EXAMPLE
In this example a BA337E Rate Totaliser is
connected to a turbine flowmeter having a K-factor
of 105 pulses per litre with a magnetic pick-off.
The BA337E 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 BA337E 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
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
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
)
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