Service manual

Section - V Repair or Replacement BT3000 PLUS Rev. 0, Soft Ver. 8 Page 12 sur 22
The temperature sensor is housed in a rectangular metallic container, which is
closely secured to the bottom of the circular aluminum reagent chamber with a
single screw accessible from the top of the chamber. The Replacement of the
temperature sensor does not require any particular care, except that the two parts
must be joined perfectly by properly tightening the screw. No temperature
verification or calibration is necessary.
5-4. REPAIR/REPLACEMENT - READING STATION MODULE
It is possible to access nearly all the parts of the reading station module for the
maintenance and the repair. The analyzer must be turned off prior to repair or
Replacement. Only in the case of the Replacement of Peltiers (located at the
bottom of module). It will be necessary to remove this module. The following
components are easily accessed without removal of the module:
1) Replacement of the Peltier
2) Replacement of Halogen lamp
3) Replacement of all the tubes of the hydraulic circuit
4) Replacement or maintenance of diluter
5) Replacement of washing piston
6) Replacement and inspection of reading cuvettes
7) Replacement of photometer
5-4.1. REPLACEMENT OF THE CUVETTE PELTIER
For the Replacement of the Peltiers it is necessary to remove the 3 mounting
screws (see Figure 3-1 entitled "Top View of the BT3000 PLUS".) To facilitate the
removal of a screw located inside, it is necessary to remove the front cabinet. It is
important to disconnect all of the cables and tubing before removing the station.
Each Peltier group contains a fan and heat sink and is securely attached with 4
screws to the base of the station. Coat the new Peltier surface with a thin layer of
thermal grease and secure it to the base of the reading station with 4 screws.
Tighten the mounting screws until they are snug, ensuring that the pressure is
applied uniformly. Do not over-tighten otherwise the Peltier may get damaged.
Ensure leads' polarity is matched correctly. The incorrect assembly of the Peltier
can cause serious malfunction of the thermostatic system.