Calibration/Adjustment - Sartorius la series Operating Instructions Manual

Calibration, Adjustment,
Linearization
Purpose
Calibration is the determination
of the difference between the weight
readout and the true weight (mass) of
a sample. Calibration does not entail
making any changes within the balan-
ce.
Adjustment is the correction of this dif-
ference between the measured value
displayed and the true weight (mass)
of the sample, or the reduction of the
difference to an allowable level wit-
hin maximum permissible error limits.
Linearization is the procedure used
to eliminate the deviation from weight
readout plotted on the balance's ideal
characteristic calibration curve and
the actual weight readout. In other
words, linearization reduces the amo-
unt of error of a weight displayed to
its maximum permissible error limits.
The ideal characteristic curve is a
straight line plotted between zero
load and maximum load.
Using Verified Balances as Legal
Measuring Instruments in the EU*:
Before using your balance as a
legal measuring instrument, you
must perform "internal calibration"
at the place of installation after the
warmup period.
* including the Signatories of the
Agreement on the European
Economic Area.
40
Available Features
Your balance can be calibrated
externally (Balance menu: CAL key
function; menu item
Ext. cal./
adj.;factory-def. wt.
or
Ext. cal./adj.;
) or
user-defined wt.
internally (
Internal cal./
).
adjustment
External calibration can
be performed
– using a preset weight value
Ext. cal./adj.;
factory-def. wt.
– with a user-defined weight
Ext. cal./adj.;
user-defined wt.
The adjustment can be performed
– automatically following
calibration:
Cal., then
or
auto adjust.
– if desired, the adjustment
operation can be started manually
after calibration:
Cal., then
manual adjust
You can also configure whether the
calibration mode
– will be activated according
to the specific setting (external/
internal) or
– can be selected by the user after
pressing the soft key:
Cal
.
Selection mode
You can have the balance
automatically display an adjustment
prompt after a certain time interval
has elapsed since the last calibration/
adjustment or when the ambient
temperature changes by a defined
amount.
You can also configure the balance
to perform calibration and
adjustment automatically (isoCAL)
when the pre-set time and/or
temperature limit is reached
and reset application
and
On without resetting
.
app
You can have the calibration/
adjustment results documented in
a ISO/GLP/GMP-compliant printout;
see page 126.
Factory Settings
Calibration/adjustment mode:
Selection mode
Calibration/adjustment sequence:
Calibrate, then auto
adjust
isoCAL function (automatic
initiation of cal./adj. sequence):
On without resetting
app.
Releasing Access to External
, or
Calibration in Verified Balances
of Accuracy Class k
Remove the covering plate from
the back of the balance housing
Move switch 1 in the direction
of the arrow
> Switch down:
external calibration accessible
Switch up:
external calibration blocked
> Note:
Do not move Switch 2
External Calibration in Verified
Balances of Accuracy Class K
– External calibration is blocked
when the balance is used in legal
On
metrology
> External calibration can only be
released after removing the
verification control seal, in which
case the validity of the verification
becomes void and the balance
must be re-verified
– External calibration can now
be performed