DIN ISO 9001 – documentation
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Operating instructions Sortimat | Edition 1
14
DIN ISO 9001 – documentation
In practical applications, the introduction of QM and TQM systems is becoming increasingly important. Here
you can find some points indicating how the accuracy of your test instrument can be documented.
Test certificate
If you sent the device to the factory, you can pay for a quality test certificate to be issued.
Comparison sample
The simplest test for checking the test status is to perform a sorting procedure with a reference sample.
Monitoring intervals for test instruments
It is recommended for the parameters stated below to be checked and documented once a year. Here is a
suggestion for a form that should make this task easier.
Checking the nominal hole widths:
A certified precision nozzle gage with a read-off accuracy of 1/100 mm is available for accurate measurement
of the nominal hole widths, see
chapter 11 for article number.
Tolerances for sieve plates:
Slot:
ISO 5223
Test sieves for cereals
Round hole: DIN ISO 3310-2 Test sieves – Technical requirements and testing –
Part 2: Test sieves of perforated metal plate
Test process
Figure 18: Diagram for selecting the hole widths to be tested
Select about 40 sieve holes (see diagram for 2.5 mm sieve with 29 x 11 holes, 44 selected).
Position the sieve plate vertically and clamp it in the clamping fixture.
Insert the measuring tip of the nozzle gage manually at an angle of 90° into the sieve hole (the gage must
be at right angles to the sieve). Advance it until you encounter resistance, but without applying force, hold
firmly at the top end, the vernier scale moves down.
Read off the result on the vernier directly in the inserted condition. Enter it in a test log (see master copy
in
chapter 14.1
NOTE
The results can be falsified by removing the nozzle gage before reading off the result, e.g.
due to the measuring tip jamming or having a pushing force exerted on it!
The sieve should be discarded if the nominal hole with is outside the tolerance required in the standard
for more than 3 values. Please contact the manufacturer!
Checking the sorting time:
There is no need to measure and check the preset sorting time. The influence of this parameter can be regarded
as slight. Please contact the factory if the preset sorting time differs by more than ten seconds. The discrepancy
can be greater in devices of an older design (year of manufacture before 1991). However, it must not be more
than one minute.
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