Service manual

Section - VI Reading Station BT3000 PLUS Rev. 0, Soft Ver. 8 Page 4 of 12
The lamp efficiency is controlled by the analyzer, which detects the radiation
insufficiency at 405nm when the optical transmission goes below the 50% of
original emission level. Bear in mind that the acquisition of 100 % is memorized
when the "SETLAMP" procedure is performed after replacing with new lamp.
6-3. READING CUVETTE SYSTEM
The consistent mass of the aluminum cuvette rotor allows for maintenance of
temperature uniformity throughout the 34 cuvette wells (Figure 6-3). The
stationary cuvette drum in aluminum encompassing the cuvette rotor integrates
Peltier modules, which thermostatically maintain the selected temperature. The
Peltier modules, relative heat sinks, and the cooling fans are affixed on the
underside of the cuvette drum as shown in the Figure 6-2.
The selected temperature is maintained to within ± 0.1ºC at the base and ± 0.2ºC
in the cuvette wells. The stationary part and the moving part are tightly matched
with 0.2mm spacing in-between. However there is a thermal gradient between the
two parts, which makes it necessary to perform accurate temperature calibrations.
The regulation of cuvette temperature is highly simplified through the software.
However it requires an appropriate thermometer for calibration adjustments. The
calibration procedure is outlined in the Section XIII, paragraphs 13-2. and 13-2.1.
CUVETTE
MAGNET AND
HALL SENSOR
PELTIER
HEAT SINK
FAN
CUVETTE DRUM
ROTOR
STEPPING MOTOR
CUVETTES PLATE
CUVETTES SYSTEM
Figure 6-3