13
6.4
Position of the decimal point:
dP
A dummy decimal point can be positioned between
any of the digits or it may be absent. To position
the decimal point select
dP
from the menu and
press
(
.
The decimal point can be moved by
pressing the
&
or
*
push button. If a decimal
point is not required it should be positioned beyond
the most or least significant digit.
When
positioned as required press the
)
button to enter
the selection and return to the configuration menu.
6.5
Calibration using an external
current source:
CAL
This function enables the zero and span of the
indicator to be adjusted using an external
calibrated current source.
When used with an
accurate traceable current source this is the
preferred method of calibration.
Zero is the indicator display with 4mA input
Span is the indicator display with 20mA input
To calibrate the indicator select
CAL
from the
configuration menu and press
(
. The indicator
will display
2Ero
which is a request for a 4mA input
current. Adjust the external current calibrator to
4.000mA and again press
(
which will reveal the
current zero display.
The flashing digit of the
indicator display can be changed by pressing the
&
or
*
buttons, when set as required pressing
(
will transfer control to the next digit. When all
the digits have been adjusted, press
)
to enter
the new zero and return to the
2Ero
prompt .
Pressing the
*
button will cause the indicator to
display
5PAn
which is a request for a 20mA input
current. Adjust the external current calibrator to
20.000mA and again press
(
which will reveal
the existing span display. The flashing digit of the
indicator display can be changed by pressing the
&
or
*
buttons, when set as required pressing
(
will transfer control to the next digit. When all
the digits have been adjusted press
)
to enter
the new span and return to the
5PAn
prompt.
Finally
press
)
again to return to the
configuration menu.
Notes:
a. The indicator input current must be adjusted to
the required value before the zero and span
functions
are
entered
by
pressing
the
(
button.
b. Indicators may be calibrated at currents other
than 4 and 20mA, within the range 3.8 to
21.0mA providing the difference between the
two currents is greater than 4mA.
If these
conditions are not complied with, the indicator
displays
FaiL
and aborts the calibration.
c. If the zero current is greater than the span
current the instrument will be reverse acting i.e.
an increasing input current will cause the
display to decrease.
6.6
Calibration using internal reference:
5Et
Using the
5Et
function the indicator can be
calibrated without the need to know the value of
the 4/20mA input current, or to disconnect the
indicator from the 4/20mA loop.
When using the
5et
function the indicator’s internal
reference is used to simulate a 4mA and 20mA
input current.
Zero is the display with a simulated 4mA input
Span is the display with a simulated 20mA input
To calibrate the indicator display select
5Et
from
the configuration menu and press
(
.
The
indicator will display
2Ero
, pressing
(
again will
reveal the current display at 4mA.
The flashing
digit can be adjusted by pressing the
&
or
*
buttons, when the flashing digit is correct pressing
(
will transfer control to the next digit. When all
the digits have been adjusted, press
)
to return
to the
2Ero
prompt.
To adjust the display at 20mA, press the
*
button
which will cause the indicator to display
5PAn
,
pressing
(
will then reveal the indicator’s existing
display at 20mA.
The flashing digit can be
adjusted by pressing the
&
or
*
buttons, when
the flashing digit is correct pressing
(
will transfer
control to the next digit. When all the digits have
been adjusted press
)
to return to the
5PAn
prompt followed by
)
to return to the
5Et
prompt
in the configuration menu.
6.7
Bargraph format and calibration:
bAr
Only the BA324G and BA324G-SS have a
bargraph.
In addition to a five digit numerical display the
BA324G has a 31 segment analogue bargraph
which may be configured to start and finish
anywhere within the indicator’s numerical display
range.
To configure the bargraph select
bAr
from the
configuration menu and press
(
. The indicator
will display
tYPE
, pressing
(
again will reveal the
existing bargraph justification which can be
changed to one of the following four or five options
using the
&
or
*
button:
Bargraph justification starts from
LEFt
Left end of display
CEntr
Centre of display
riGHT
Right end of display
Alr5P
Only
with
alarms
-
see
section 9.3.14
oFF
Bargraph disabled
When set as required press
)
to return to the
tYPE
sub-function prompt.
