Dynisco UPR900 Manuel d'application et de configuration - Page 5

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Calibration
Reminder



A
calibration
reminder
can
be
set
if
Data
Recorder
option
is
fitted
(which
means
instrument
has
battery‐backed
Real
Time

Clock).
The
addition
of
a
clock
means
that
the
instrument
can
be
aware
of
the
date
and
time
(even
when
powered
down).

This
information
can
be
used
to
remind
the
user
to
calibrate
the
inputs
at
a
specified
future
date.
The
date
is
set
in
the
Input

Configuration
menu.
If
enabled
and
the
date
set
is
exceeded,
a
calibration
due
screen
is
shown
every
24hrs
(and
at
every

power‐up)
until
it
is
changed
to
a
future
date
(or
disabled).



Linear
and
Temperature
Calibration
&
Scaling

UPR900
&
ATC990

Linear
(non‐strain
gauge)
and
Temperature
Calibration



The
instrument
offers
single
point
calibration,
with
zero
offset
adjustment
only,
or
two
point
calibration,
with
both
zero
&

span
adjustments.



Single
Point
Calibration



A
'zero
offset'
applied
to
the
process
variable
across
the
entire
span.
Positive
values
are
added
to
the
reading,
negative

values
are
subtracted.
Can
be
used
if
the
error
is
constant
across
the
range,
or
the
user
is
only
interested
in
a
single
critical

value.

To
use,
select
Single
Point
Calibration
from
the
input
calibration
menu,
and
enter
a
value
equal,
but
opposite
to
the
observed

error
to
correct
the
reading.





Single
Point
'Offset

Calibration'
value

New
Displayed
Value

Original
Displayed



Two
Point
Calibration



This
method
is
used
where
an
error
is
not
constant
across
the
range.

Separate
offsets
are
applied
at
two
points
in
the
range
to
eliminate
both
"zero"
and
"span"
errors.
To
use:

1. Measure
and
record
the
error
at
a
low
point
in
the
process.

2. Measure
and
record
the
error
at
a
high
point
in
the
process.

3. Go
to
the
first
two
point
input
calibration
screen.

a. Enter
the
desired
low
point
value
as
the
Calibration
Low
PV
value.



Value

This
example
shows
a
positive
offset
value.

For
example:

If
the
process
displays
27.8
when
it
should

read
30,
The
error
is
‐2.2
so
an
applied

offset
of
+2.2
would
change
the
displayed

value
to
30.

The
same
offset
is
applied
to
all
values,
so

at
100.0
the
new
displayed
value
would
be

102.2.