15
Alternatively if the total display is required in
thousand of UK gallons
= 1 litre = 1 litre
1 gallon 1/(4546.1) litres
SCALE-t = 4546.1
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 to 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 errors resulting from the totalisation of
very low flow rates over long periods, the BA558C
rate display can be forced to zero when the flow
rate falls below a specified value. This 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. This clip-off threshold is shown
as a percentage of total flow and 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
When turned on this function enables the operator
to reset the BA558C total display to zero by
operating the Up and Down push-buttons
simultaneously. To check the status of the
function select 'LOC. rSET'' from the menu and
press P. If required 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. The current security code
will be displayed which may 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 display 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.
