Chapter 1 Use and maintenance: reminders and further information
13
Maintenance manual
2016/02
AlveoPC
4.
Control chart
■
To guarantee optimal alveographic measurement accuracy,
and to detect an incident as soon as possible, carry out regular
control tests with a control flour, in identical testing conditions.
❏
Regular monitoring of the results of these control tests will more
particularly help pinpoint any deviation caused by a disturbance,
wear, fouling, deterioration…
❏
It should be noted that when speaking of “Abnormal results” (see
fault detection tables in this manual or the user manual), this verdict
is assumed to be based on a control test.
❏
We recommend drawing up “control charts” for each instrument.
METHOD
■
Each control chart should include:
❏
its date of creation (the date of the first test),
❏
the reference of the sample,
❏
its humidity,
❏
a results monitoring graph:
- parameters/date,
- indication of tolerances.
Note:
This control chart can advantageously be created by com-
puter (a spreadsheet for instance).
■
Alveograph control chart:
The parameters to record on the control chart are:
Note:
The information below in no way constitutes a procedure for preparing control charts;
this is the task of the customer's Quality Assurance services, whether or not in connec-
tion with a certification process.
It simply offers instructions that CHOPIN Technologies recommends bearing in mind
when drawing up control charts.
measurement
time
boundary value
alarm threshold
Parameter
Practical
tolerance
limit
ISO standard 5530
P
Persistence
±8%
see the repeatability and
reproducibility limits
recommended by the ISO
5530 standard
L (or G)
Extensibility
±5%
W
Baking strength
±8%
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