4:4
Service Manual 1001 5015 / Rev. 4
•
Were determinations made induplicated?
•
How was sample selection performed?
•
Was grinding performed?
•
What is the reference methods reproducibility?
•
Is the moisture basis the same in the laboratory results as in the Infratec results?
4.1.6
Instrument Problems
•
The Measuring Unit compartment of the instrument should be kept as clean as
possible. Do not forget to sometimes also clean the Detector Window on the Cell
House and the Cell Window. By cleaning the instrument regularly you avoid
excessive dust build-up and thereby you lower the risk of stoppage. For cleaning
instructions, see User Manual.
•
Do they have a reference set of samples that they measure frequently on the
instrument? This should be done to see if the instrument has changed! What
changes?
•
How is the sub-sample standard deviation for each constituent?
•
Does it change during the day?
•
Do the results drift during the day? If so, how much and does this occur every
day?
4.1.7
I
2
C Trouble Shooting
Infratec 1241 is basically a PC with some extra hardware to perform analysis. The
hardware is connected to the PC via a two-wire bus called the I2C. This is a Phillips
developed bus.
All communication (commands, analytical data, error messages) is performed
through the bus. Fig. 4:1 shows the bus and all connected equipment. Note that some
equipment is separate but connected to the bus. When the extra modules are
connected the bus will detect the extra nodes (addresses) and open up the software to
control them.
The instrument software can be divided into three levels, not counting the BIOS and
the operating system. The top level is the ISW (instrument Software), which is han-
dling all information to for example the display. The DSP software is controlling the
I2C communication as well as being a co processor for mathematical treatment of the
data signal. In certain modules there are software (firm ware) controlling low level
tasks like opening and closing the shutter in the Measuring Unit.
When the power is turned on the BIOS at the processor starts working. After some
seconds there is a beep as in a normal PC and then the operative system QNX (UNIX
type) starts working. After some initiation the ISW starts and the DSP software is
down loaded from the flash disc to the DSP processor and starts to run. About this
time the signal to turn on the display is sent to the power supply via the I2C bus and
information starts to flow showing the start up procedure.
Summary of Contents for Infratec 1241
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