Calibration/Adjustment - Sartorius LA Reference Series Operating Instructions Manual

Calibration/Adjustment

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 balance.
Adjustment is the correction of this
difference between the measured value
displayed and the true weight (mass) of the
sample, or the reduction of the difference
to an allowable level within maximum
permissible error limits.
40
Available Features
You can configure whether the calibra-
tion mode
– will be activated according to the spe-
cific setting (external/ internal) or
– can be selected by the user after press-
Cal Selection
ing the soft key:
mode
.
Your balance can be calibrated
externally (Balance menu:
CAL key function; menu item
Ext. cal./adj.;
. or
factory-def. wt
cal./adj.; user-
defined wt.
) or internally
Internal cal./
(
adjustment
).
External calibration can be performed
– with a user-defined weight
Ext. cal./adj.;
user-defined wt.
The adjustment can be performed
– automatically following calibration:
Cal., then auto
adjust.
or
– if desired, the adjustment operation can
be started manually after calibration:
Cal., then manual
adjust
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
On and reset applica-
tion On without
and
resetting app.
You can have the calibration/
adjustment results documented in
a ISO/GLP/GMP-compliant printout;
see page 116.
Factory Settings
Calibration/adjustment mode:
Selection mode
Calibration/adjustment sequence:
Calibrate, then auto
adjust
isoCAL function (automatic initiation of
cal./adj. sequence):
resetting app.
Start automatic adjustment:
isoCAL
Ext.
Print GLP/GMP calibration/adjustment
Automatic if GLP
record:
is selected
Releasing Access to External Calibra-
tion 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
For service technicians only:
External Calibration in Verified Bal-
ances of Accuracy Class K
– External calibration is blocked when the
balance is used in legal 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
On without