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Service manual
4.3.6. Needle rotor thermostatation system test
This screen makes it possible to check that the temperature of the rotor reactions is 37ºC. To make this test, the
analyzer must be initialised. The methacrylate rotor can be automatically lled with distilled water by pressing
the corresponding button. Once lled, the technician must wait a few minutes for the rotor to be thermostated.
The temperature in the rotor wells must be measured with a temperature calibrated at 37ºC through the dis-
pensing hole of the rotor cover. A button makes it possible to turn the rotor in increases of 15 wells to change
the well on which the measurement is being taken. The program shows the set point temperature of the current
control. This parameter must be other than 37ºC. The technician must measure the temperature of the water
with the calibrated thermometer in the wells and enter the temperature on the screen. The program indicates if
the temperature measured is within the tolerated error margins and stores this value for the test result reports.
4.3.7. Photometry tests
This screen contains a set of tests to check the functioning of the optical system. The tests are classied under
different tabs. First of all, the base line and darkness count tests must be made in order to be able to carry out
the remaining tests. To perform these tests, the analyzer must be initialised.
The optical system has a photodiode that generates an electrical current proportionate to the light intensity on
it. time. An AD converter converts the accumulated load into a digital value called count number, between 0
and 1048576. During normal functioning, the analyzer automatically adjusts the integration time for each lter
when the analysis begins and after initialisation. When the rst photometry test is performed, the integration
times are also automatically adjusted. These times are adjusted in such a way that the count number of the
base line for each wavelength is as near as possible to 950000. In this way, the dynamic range of the detection
system is adapted to the light intensity present at each wavelength. The lter wheel has 10 positions. Position
0 must always contain a covered lter so that the analyzer can perform the darkness adjustment. Positions 1
to 9 can be used for optical lters.
4.3.7.1. Base line and integration times
When this test is run for the rst time, the analyzer lls the rst 3 rotor wells with distilled water. The analyzer
automatically adjusts the integration times and makes a base line with each of the available lters in each of
the 3 wells. The program shows the current integration times for each of the lters and the average for the 3
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