Ohaus Voyager Balances - Manual (Page 292)

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Balance modes
6.10 Statistical quality control (SQC)
The Statistical Quality Control (SQC) feature is extremely useful during various types of process filling operations when
it is desired to monitor and control the process to eliminate under and over filling. Provisions are made in the balance
to accommodate the weight of various packaging methods. During operation, parameters of the packaged product
are set into the balance such as packaging weight, acceptable weight limits and non-acceptable weight limits of the
product. These weight limits are identified as +Tl, +T2, NOMINAL and -TI, -T2. As samples are weighed and stored in
the balance, a trend analysis is developed and displayed on the balance. Up to 25 samples in a batch with up to ten
batches are visible on a trend screen for quality control purposes. Each batch of samples is shown on the display
which indicates the maximum/minimum standard deviation and mean values for each batch. An on going examina-
tion of the relative deviation of the samples along with other statistical data can be viewed and is stored. By observing
the results of the TREND ANALYSIS screen, you can effectively monitor the filling process operation. Setup parameters
can be stored in the library and up to 5 products with statistical history can be stored in memory. All SQC information
can be printed.
CHANGE MODE
Enter
SQC SETUP
LIBRARY NAME
SQC SETUP
From main menu
Enter CHANGE MODE and select SQC, display advances to LIBRARY NAME.
Library name
Enter a Library Name, up to 8 characters and press Enter button. Display
advances to SQC SETUP with TOLERANCE highlighted. If a previous name
was entered and selected, the balance uses the parameters which were
previously set.
Tolerance
Enter TOLERANCE. Display advances to DEFINE TOLERANCE with +T2 high-
lighted.
LIBRARY NAME SQC1
TOLERANCE
TARE NO TARE
MEAN TARE VALUE OFF
AUTO SAMPLEOFF l
AUTO PRINT OFF
NUMBER OF SAMPLES I
BATCH NAME
DEFINE TOLERANCE Defining tolerances
Define the tolerances for your product. Start with +T2, continue with +Tl,
NOMINAL WEIGHT, then -TI, finish with -T2. After entering values, press Enter
button. Display advances to RETURN TO SETUP, press Enter button.
+T2 0.000
+T1 0.000
NOMINAL WEIGHT O.O00
-Ti 0.000
-T2 0.000
RETURN TO SETUP
Selecting tare
Select TARE and press Enter button. Display advances to TARE SELECTION
with NO TARE highlighted.
SQC SETUP
LIBRARY NAME SQC1
TOLERANCE
TARE NO TARE
MEAN TARE VALUE OFF
AUTO SAMPLEOFF l
AUTO PRINT OFF
NUMBER OF SAMPLES I
BATCH NAME
Enter
SQC