17
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.
6.14 Percentage Clip-off: CLIP-OFF
To prevent totalisation of very low flow rates which
over long periods may result in significant
totalisation errors, the BA354ND 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.
6.15 Local reset of total display: LOC. rSET
This function enables the operator to reset the
BA354ND total display to zero 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.
6.16 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
