14
6.1 Calibration procedure
The BA534D rate totaliser may be calibrated on-
site without disconnection from the power supply
or from the flowmeter.
Step 1
Enter the programming mode
Put the BA534D in the programming
mode by simultaneously pressing
P
and
E.
Assuming a security code has
not already been entered the
instrument will respond by displaying
'UPdAtE' which is the first function in
the main menu. See Fig 6.
Step 2
Select the interval between display
updates
With 'UPdAtE' displayed, press
P
to
reveal the existing interval between
display updates. If this is not as
required, press the
Up
or
Down
button
until ‘0.5’ is displayed. (0.5 seconds i.e.
2 display updates per second). Enter
the revised time and return to the
'UPdAtE' prompt in the main menu by
pressing
E
.
Step 3
Select the type of input
Using the
Up
or
Down
button scroll
through the main menu until ‘InPut’ is
displayed, then press
P
to reveal the
existing setting. Select ‘COIL’, the
input for a magnetic pick-off, using the
Up
or
Down
button and return to the
'InPut' prompt in the main menu by
pressing
E
.
Note:
The BA534D has two pairs of
input terminals. 3 & 4 for voltage inputs
and 5 & 6 for switch contact, proximity
detector or open collector inputs.
Ensure that the magnetic pick-off,
which has a voltage output, is
connected to terminals 3 & 4.
Step 4
Position rate & total decimal points
Select ‘d.P.’ from the main menu and
press
P
. The rate and total displays
will be activated with one digit of the
total display flashing. Press the
Up
or
Down
push-button until the third least
significant digit of the total display and
following decimal point are flashing.
This gives the required total display
resolution of 0.01
Press
P
to move control to the rate
display. Using the
Up
or
Down
push-
button move the flashing digit to the
least significant position (right hand
side) which will result in no decimal
point being displayed.
Finally press
E
to return to the 'd.P’.
prompt in the main menu.
Step 5
Enter the rate scaling factor
Select ‘SCALE-r’ from the main menu
and press
P
to show the current figure.
The K factor of the flowmeter in this
example is 1050.0* pulses per litre
which should be entered as the rate
scaling factor.
Firstly to position the decimal point,
operate the
P
push-button to move the
flashing digit to the second least
significant position. Pressing the
Up
and
Down
buttons simultaneously will
then position the decimal point in front
of the least significant digit.
Using the
Up
and
Down
buttons to
adjust each digit in turn and the
P
button to transfer control between
digits, enter 1050.0 Finally return to
the 'SCALE-r' prompt in the main menu
by pressing
E
.
Could also be entered as 1050
Step 6
Enter the rate timebase
Select ‘t-bASE’ from the main menu
and press
P
to show the current
setting. In this example the rate
display is required in litres per hour.
Using the
Up
or
Down
button scroll
through the three options and select
‘tb-3600’ which will multiply the rate
display by 3600. Return to the ‘t-bASE’
prompt in the main menu by pressing
E
.
Step 7
Adjust the rate filter
The rate display filter parameters
should be adjusted experimentally after
installation to provide a stable rate
display with an acceptable step
response.
Summary of Contents for BA534D
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