15
The total scale factor SCALE-t is not dependent
on the rate display units of time. i.e. flow units
per second, minute or per hour. The timebase
t-bASE accounts for these differences.
To check or change the total scale factor select
'SCALE-t' from the main menu and press
P
to
reveal the existing setting, one digit will be
flashing. The value of the flashing digit can be
changed by pressing the
Up
or
Down
buttons.
When this digit is correct pressing
P
will transfer
control to the next digit.
To position the decimal point, move the flashing
digit to the left hand side of the required decimal
point position and simultaneously press the Up
and Down buttons.
When the required total scale factor has been
entered, press
E t
o store the number and return
to the main menu.
*Note:
The maximum numerical value of
SCALE-t is 65535 irrespective of the decimal
point position. i.e. 6.5535; 65.535; 655.35;
6553.5 and 65535.
5.14 Percentage clip-off: CLIP-OFF
To prevent totalisation of very low flow rates
which over long periods may result in significant
totalisation errors, the BA554D rate display can
be forced to zero when the flow falls below a
specified value. The threshold may be
adjusted between 0 and 10% of flow for linear
inputs, and between 5 and 10% of flow for
square law inputs linearised by the root
extractor.
To check or change the cut-off point select
'CLIP-OFF' from the main menu and press
P
to
reveal the current setting. The threshold which
is shown as a percentage of total flow may be
adjusted in one percent increments using the
Up
or
Down
buttons. When set as required, press
the
E
button to enter the revised figure and
return to the main programme menu.
5.15 Local reset of total display: LOC. rSET
This function enables the operator to reset the
BA554D total display to zero from the display
mode by operating the
Up
and
Down
push-
buttons simultaneously. To check the status of
the local reset function select 'LOC. rSET'' from
the menu and press
P
which will reveal if the
function is 'On' or 'OFF'. If necessary press the
Up
or
Down
button to change the setting,
followed by the
E
button to return to the main
menu.
5.16 Security code: COdE
The calibration and conditioning of the
instrument may be protected by a four digit
security code which must be entered before
access to the programme menu is granted.
New instruments are programmed with the
default security code 0000 which allows
unrestricted access to all programming
functions.
To enter a new security code select 'COdE' from
the menu and press
P
which will cause the
instrument to display the current security code.
Each digit of the code can be changed using the
Up
and
Down
push-buttons, and the
P
button to
move to the next digit. When the required code
has been entered press
E
to return to the main
menu. The revised security code will be
activated when the indicator is returned to the
operating mode.
If the security code is lost, access to the
programmable functions can be obtained by
moving the internal security link to the override
position. The original security code can then be
viewed by selecting 'CodE' from the main menu
and pressing
P
.
Fig 8 Location of security code override link
