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5. PROGRAMMING & CALIBRATION

The BA524D is programmed and calibrated via
four push-buttons which are located behind the
instrument control cover. When frequent access
to the push-buttons is required, the indicator can be
supplied with external membrane push-buttons
mounted on the outside of the control cover.

All the programming functions are contained in an
easy to use menu which is shown diagramatically
in Fig 6. Each function is summarised in section
5.1 which includes references to more detailed
information. Although this simple menu driven
system enables most adjustments to be made
without repeated reference to this manual, we
recommend that at least the summary of the
programmable functions in section 5.1 is read
before attempting programming or recalibration.

When the indicator is fitted with alarms, linearisa-
tion or a tare function, the basic menu is expanded
to include functions associated with these optional
features. All the optional functions are described
in section 8 of this manual.

Throughout this manual push-buttons are shown in
italics e.g.

push-button, and legends

displayed by the indicator are shown within
inverted commas e.g. 'CAL' and ' ALr2'.

Access to the programme menu is obtained by
operating the

and

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 indicator
will display 'COdE'. Press

to clear this prompt

and enter the security code for the instrument using
the

Down

and

push-buttons. If the correct

code has been entered pressing

will cause the

first parameter 'root' to be displayed. If an incor-
rect code is entered the indicator will return to the
display mode.

Once within the menu the required parameter can
be reached by scrolling through the main menu
using the

and

Down

push-buttons as shown in

Fig 6. When returning to the display mode follow-
ing recalibration or changes to any parameters, the
indicator will display circulating decimal points for a
few seconds while the new information is stored in
permanent memory.

All new BA524D indicators are supplied calibrated
as requested at the time of ordering. If calibration
is not requested, the indicator will be set to display
0.00 with 4mA input, and 100.00 with 20mA input,
but can easily be re-calibrated on-site.

5.1 Summary of programmable functions

This section summarises all of the programmable
functions and when read in conjunction with Fig 6
provides sufficient information to condition and
calibrate the indicator. A cross-reference to more
detailed information is given for each function.

Display

Description of function

'root'

Square root extractor

Turns the square root extractor for
linearising the output from differential
flowmeters 'on' or 'off'. This function is
omitted when a lineariser is installed.
See section 5.2

'rESn'

Display resolution

Selects the resolution of the least
significant display digit. May be set to
1, 2, 5 or 10 digits.
See section 5.3

'd.P.'

Decimal point

Positions the dummy decimal point
between any of the digits or turns it off.
See section 5.4

'CAL'

Calibration of display using external
current source.

Enables the zero and span of the
indicator to be adjusted using an
external current source such as a
calibrator. Also enables a complete
loop to be calibrated from primary
element to the indicator display.
When used with an accurate traceable
current source this is the preferred
method of calibration.
See section 5.5