To adjust the display at the span input, press the
*
button which will cause the meter to display
5PAn
pressing
(
will then reveal the meter’s
existing span display with one digit flashing. The
flashing digit can be adjusted by pressing the
&
or
*
button, when the flashing digit is correct
pressing
(
will transfer control to the next digit.
When all the digits have been adjusted, pressing
(
will transfer control to the decimal point which
should normally be positioned in the same place
defined in the
dp
function. When set as required
press
)
twice to return to the
5Et
prompt in the
configuration menu.
5.9
Trim temperature display:
tri
This function only appears in the configuration
menu when the A90-SS meter has been
configured for a resistance thermometer input.
The trim function enables the zero and span of the
temperature display to be adjusted to compensate
for the cable resistance of a two wire connected
RTD and the cable imbalance of a three wire
connected RTD. Compensation can also be
applied for primary element interchangeability
errors. .The
tri
function also contains a clear trim
function
clr.t
which removes any zero and span
trim that has been applied and returns the A90-SS
meter’s temperature display calibration to the
Pt100 figures specified in IEC 60751.
To compensate for cable imbalance connect a
calibrator with resistance equivalent to the required
lower A90-SS meter temperature reading in place
of the resistance thermometer.
Please see caution
at the end of this section.
Select
tri
from the
meter configuration menu and press the
(
button
which will result in the meter displaying
2ero.
Pressing
(
again will cause the lower meter
reading to be displayed with one digit flashing.
The A90-SS meter can now be trimmed to display
the correct temperature equivalent to the calibrator
resistance. Pressing the
&
or
*
button will
adjust the flashing digit and the
(
button will
transfer control to the next digit. When the A90-SS
meter display is correct, press
)
to return to the
2ero
prompt.
To trim the upper A90-SS meter reading first set
the calibrator to the resistance equivalent to the
required upper A90-SS meter temperature reading.
Please see caution at the end of this section.
Select
5pan
by pressing the
&
or
*
button
followed by
(
. The upper reading can then be
trimmed in the same way as the lower reading.
When the A90-SS meter upper display is correct
press
)
to return to the
5pan
prompt.
The sub-function
clr.t
removes any zero and span
trim that has been applied and returns the A90-SS
meter’s temperature display calibration to the
Pt100 figures specified in IEC 60751. To clear
trim select
tri
from the A90-SS meter
configuration menu and press the
(
button which
results in the meter displaying
2ero
. Using the
&
or
*
button select
clr.t
and press
(
which will
result in
no
being displayed, change this to
ye5
using the
&
or
*
button and press
)
. The
meter will display
t
.
clrd
while the trim is being
removed and will then return to the display mode.
Note:
The calibrator connected to the A90-SS
input must be set to the required input temperature
or resistance
before
the
2ero
or
5pan
functions are
entered by operating the
(
button. Failure to do
this will result in trim errors.
5.10 Bargraph format and calibration:
bAr
In addition to the five digit numerical display the
A90-SS panel meter has a 31 segment analogue
bargraph which may be configured to start from the
left, centre or right hand end and to represent any
part of the meter’s numerical display range.
To configure the bargraph select
bar
from the
configuration menu and press the
(
button
.
The
meter 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 starts from
LEFt
Left end of display
CEntr
Centre of display
riGHT
Right end of display
Alr5P
Only with alarms – see section 7.3.15
oFF
Bargraph disabled
When set as required press
)
to return to the
tYPE
sub-function prompt.
The panel meter’s digital display at which the
bargraph starts is defined by the
bArLo
sub-
function which is accessed from the
tYPE
prompt
by pressing
&
or
*
buttons. When
bArLo
is
displayed operating the
(
button will reveal the
current meter display at which the bargraph starts.
The flashing digit can be adjusted by pressing the
&
or
*
button, when set as required pressing
(
will transfer control to the next digit. When all
the digits have been adjusted, pressing
(
will
transfer control to the decimal point which should
normally be positioned in the same place defined
in the
dp
function. When set as requied press
)
to return to the
bArLo
prompt from which
bArHi
which defines the finishing point of the bargraph
can be selected by pressing the
&
or
*
buttons.
bArHi
is adjusted in the same way as
bArLo
.
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