10
Service manual
computer containing the application program. Through this program, the user can control all the operations of the analyzer.
The analyzer may be fitted with the option of an external module for measuring ion concentration.
1.1.1. Operating arm
This is a three-axis XYZ Cartesian mechanism. The X and Y axes move the dispensing needle over the analyzer horizontally
and the Z axis moves it vertically. It is operated by three step-by-step motors. In each 15-second preparation cycle, the
operating arm performs the following actions: first of all, it sucks in the reagent from the corresponding bottle. Next, the
needle is washed externally in the washing station and sucks in the sample from the corresponding tube. It is washed
externally again and dispenses the sample and the reagent into the reactions rotor. Finally, it is exhaustively washed
internally and externally before proceeding with the next preparation. The arm has a system for controlling vertical
movement to detect whether or not the needle has collided into anything on descending. If a collision occurs, as may be
the case if, for example, a lid has been left on a bottle of reagent, the arm automatically restarts, verifies the straightness
of the needle and continues working issuing the corresponding alert to the user. A vertical axis retention system prevents
the needle from falling in the case of a power cut, avoiding injury from the needle to the user or the needle being bent by
an attempt to move the arm manually. The operating arm only makes the preparations if the general cover of the analyzer
is closed. If the cover is raised while it is functioning, the arm automatically aborts the task in progress and returns to its
parked position to avoid injury to the user.
1.1.2. Dispensing system
This system consists of a thermostatised needle, supported and displaced by an operating arm and connected to a
dispensing pump. The needle is detachable to enable cleaning and replacement. The analyzer has capacity level detection
to control the level of the bottles and tubes and prevent the needle from penetrating too far into the corresponding liquids,
thus minimising contamination. An automatic adjustment system informs the user if the needle is not mounted or if it is
too bent. The needle has a sophisticated Peltier thermostatisation system, with Fuzzy Logic control, capable of
thermostatising the preparations at approximately 37º in less than 6 seconds. Dispensing is carried out by means of a
low maintenance ceramic piston pump driven by a step-by-step motor. It is capable of dispensing between 3 and 1250 L.
The exterior of the needle is kept constantly clean by means of a washing station, which consists of a font specially
designed to clean and dry the needle, integrated in the racks tray. A system of diaphragm pumps supplies the font with
distilled water and transports the waste to its container.
The A25 analyzer has a tray with 6 free positions for racks of reagents or samples, plus three fixed positions for bottles
opposite the washing station. Each reagents rack can carry up to 10 reagents in 20 ml or 50 ml bottles. Each samples
rack can contain up to 24 tubes of samples. The samples can be patients, calibrators or controls. The analyzer can be
configured to work with 13 mm or 15 mm diameter tubes of samples with a length of up to 100 mm or with paediatric
wells. Any possible configuration of racks can be mounted from 1 rack of reagents (10 reagents) and 5 racks of samples
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