Roche Diagnostics April 2007
A-28 Service manual · Version 2.0
4 Description of modules 91xx pH/Electrolyte Analyzers
Description of modules
Cleaning solution (9110 only)
The cleaning routine within the 9110 pH Analyzer is automatic with cleaning solution
being aspirated through the system every 40th sample or every 24 hours. Automatic
operator-initiated cleaning can also be performed, by selecting ELECTRODE
CLEANING from the main menu. The cleaning routine is very similar to the
aspiration of Standard A or B with solenoid valve C being opened to allow cleaning
solution to be aspirated through the fluidic path. The timing of the cleaning solution
routine allows for a larger volume of cleaning solution to be aspirated than the
Standard A or B cycles to ensure that cleaning solution covers the electrodes, wash
port, fill port, sample needle and preheater during the cleaning cycle.
Reference solution
The reference housing is filled automatically using the second winding of the
peristaltic pump and solenoid valve R. The reference solution connector allows for
the reference housing tubing to be plugged into the reference solution circuit. As the
peristaltic pump aspirates reference solution, solenoid valve R is opened to allow
excess solution to be pumped into the reference return line of the ISE SnapPak
TM
.
A check valve is placed in the return line to ensure that the KCl output is constant
(9110 only).
Waste liquids
Calibration standard and sample waste are pumped out of the left side of the
electrode module (green-banded tubing) through the peristaltic pump to the waste
line of the ISE SnapPak
TM
. An internal one-way valve is incorporated into the waste
line of each ISE SnapPak
TM
to prevent any waste products from leaking out of the ISE
SnapPak
TM
.
Main tube set (all models)/ Intake tube set (9110 only)
The main tube set is supplied as a pre-cut tubing harness with the fluidic
interconnections preassembled. Replacement of the tube set should be performed
annually. For removal of the tubing, first remove the ISE SnapPak
TM
from the reagent
compartment. This will allow access for removal of the white TPR block which is the
main interconnection between the ISE SnapPak
TM
and the tubing. This block can be
removed by grasping the front surface and pulling forward. Next, remove tubing from
each solenoid valve. Follow the procedure outlined in Section 4.1.5 for disassembly of
the solenoid valves to enable fluidic tubing to be easily removed at each solenoid.
e
For details, see Rear panel assembly on page A-25, SBC board on page A-26.
Pull the two pump windings at the peristaltic pump tube set off the pump roller and
remove the white reference solution tube connector. Remove the white TPR reference
solution block by grasping the front of the block and pulling forward. The three tube
connections are labeled with green, blue and red tags. All remaining tubes can now be
removed and the entire tubing harness can be discarded.
Fit the replacement tubing harness and assemble in reverse order as disassembly.
Reference the Tube Diagram on the next page for correct tube locations.
Intake Tube Set (9110 only) The intake tube set comprises three pieces of tubing. A short piece (red tag) fits
between the white T-piece and the standard contact. The long piece can be positioned
between the standard contact and the wash port. The remaining tube can be fitted
between the sample needle and the preheater tube.
To Next Page
Loading...
