SQmin Function
Purpose To display the allowable minimum sample quantity “SQmin” (sample quantity
minimum) in accordance with the United States Pharmacopoeia (USP). According to
USP guidelines, the uncertainty of measurement may not exceed 0.1% of the sample
quantity when substances are weighed with the highest degree of accuracy for
volume determination. This additional function ensures that weighing results lie
within defined tolerance limits corresponding to the requirements of your quality
assurance system.
System Requirements The scale must be set up by a service technician to be able to use the SQmin
function. The technician will determine the permitted minimum sample quantity
and load this to your scale using the guidelines of your QA system. He will document
this setting via a “Weighing module test as per USP" certificate in which the
measurements and min. sample quantity are logged. The SQmin function ensures
that the weighing results correspond to USP guidelines. These SQmin settings
cannot be changed by the user.
Features – Displaying the minimum sample quality: The value is displayed in the text line
for 4 seconds after pressing the k key.
– If the minimum sample quantity has not been reached: The k symbol is
displayed and weight values are marked with a “!" in the printout.
– GLP header: The minimum sample quantity entered for SQmin can be included
on the printout.
Setting SQmin parameters
The SQmin display must be turned on to use the SQmin function.
Menu: SETUP / SQMIN /
SQmin display: DISPLAY yes/no*
Print in GLP header: GMP PRT. yes/no*
* = Factory setting
Operating Instructions Combics Indicators 49
Operation
4.) Place the calibration/adjustment weight
on the weighing platform. The adjust-
ment weight is displayed once the adjust-
ment is finished. Remove the adjustment
weight from the weighing platform.
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