Ohaus Voyager Balances - Manual (Page 115)

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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
examination 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
Balance modes