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Service manual

for the measurement procedures it is to carry out. The user may choose between performing the blanks and the

calibra tors or not. If they are not performed, the analyser uses the last available memorised data. The controls can

also be activated or not. During a session, while the analyser is working, the user can introduce new normal or urgent

samples to be analyzed. Each time a new sample is added, the analyser automa tical ly proposes the possible new

blanks, calibrators or controls to be performed. A work session can remain open for one or more days. When a session

is closed and another new session is opened (Reset Session), the analyser again proposes performing the blanks,

calibrators and controls. It is recommended that the session is reset each working day.

The analyser determines the concentrations of the analytes based on optical absorbance measurements. To measure

the concentration of a certain analyte in a sample, the analyser uses a pipette to take a specic volume of the sample

and the corresponding reagent, quickly thermostates them in the needle itself and dispenses them into the reactions

rotor. The very dispensing speed together with the geometry of the reaction well causes the mixture to be shaken and

the chemical reaction begins. In the bireagent modes, the reaction begins when the analyser later dispenses a second

reagent in the same reaction well. The reactions can be biochemical or turbidimetric. In both cases, the reaction or

the chain of reactions produced generate substances that attenuate certain wave len gths, either by absorption or by

dispersion. Comparing the light in ten sity of a certain wavelength that crosses a well when there is a reaction and when

there is not a reaction can determine the concentration of the corresponding analyte. This comparison is quantied

with the physical magnitude called absorbance. In some cases, the concentration is a direct function of the absorb-

ance, and in other cases, it is a function of the variation of the absorbance over time, depending on the analysis mode.

1.3. TRANSPORT AND RESHIPMENT OF THE ANALYZER

If the analyser is to be reshipped or moved using a transport vehicle, it is important to block the operating arm and

use the original packaging to ensure that the apparatus is not damaged. To package the instrument, we recommend

you follow the following instructions: (on the unpackaging instruc tions sheet)

biosystems A15 User Manual

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