11
For example, if a BA354D is displaying rate in litres
per minute, setting 'SCALE-t' to 4.5461 produces a
total display in UK gallons. Alternatively, setting
'SCALE-t' to 4546.1 will produce a total display in
thousands of UK gallons.
The total is calculated and the display updated
twice per second, which defines the resolution of
the total flow display. When total alarms are used
for batching applications, this resolution may
define the accuracy of the system.
6.2 Accessing programming functions
Throughout this manual push-buttons are shown in
italics e.g.
P
or
Up
push-button, and legends
displayed by the instrument are shown within
inverted commas e.g. 'CAL' and ' ALr2'.
Access to the programme menu is obtained by
operating the
P
and
E
push-buttons
simultaneously. If the instrument is not protected
by a security code the first parameter 'root' will be
displayed. If a security code other than the default
code 0000 has already been entered, the
instrument will display 'COdE'. Press
P
to clear
this prompt and enter the security code for the
instrument using the
Up
or
Down
push-button
adjust each digit, and the
P
push-button to move
control to the next digit. If the correct code has
been entered pressing
E
will cause the first
parameter 'root' to be displayed. If an incorrect
code is entered, or a push-button is not operated,
the instrument will timeout after ten seconds and
automatically return to the display mode.
Apart from defining the position of the decimal
point in the rate display all programme functions
and prompts are shown on the large eight digit
display.
Once within the main programme menu the
required parameter can be reached by scrolling
through the menu using the
Up
and
Down
push-
buttons as shown by the programme structure in
Figs 7A and
7B. When returning to the operating
mode following recalibration or changes to any
parameters, the total display will show circulating
decimal points for a few seconds while the new
information is stored in permanent memory.
All new BA354D are supplied calibrated as
requested at the time of ordering. If calibration
information is not supplied, the BA354D will be set
to display a rate of 0.00 with 4mA input and 100.00
with 20mA input. The total scale factor will be set
to 1 with a timebase of seconds.
