Bayer HealthCare RapidPoint 400 Series Service Manual page 59

The optical head contains the optics that deliver light to and collect light
from the sample chamber. The optical head houses four lenses, two
mirrors, and the detector module.Two lenses and mirror direct the light
from the fiber bundle onto the sample chamber. On the other side of the
optical head another mirror and set of lenses collect the light that is not
absorbed by the sample. A fiber bundle, connected from the optical head
to the polychromator, relays the light for measurement. The spring link
holds and locates the optical head.
The detector module uses a thermistor to ensure that the CO-ox sample
chamber temperature is kept constant, and a flag detector system to detect
the position of the sample chamber during measurement. The flag detector
system consists of two emitters and two photo detectors that detect the
position of the sample chamber.
The drive wheel is attached to the drive shaft of the motor, and engages a
mechanism in the measurement cartridge that moves the sample chamber
to the open and closed positions.
CO-ox Sample Chamber Interface
Rev. C Mechanical Descriptions 59