Replacing The Bottle Tubing - Siemens RAPIDLAB 248 Operator's Manual

Maintaining the System
Replacing the Reference Sensor Cassette
6. Check that 'O' rings are fitted to each side of the sensor and are in
7. Refit the reference sensor top first, aligning the sensor contacts.
8. Lower the front cover and restart the 248 system. The 248
NOTE:
the 248 to require a stabilization period of 30 minutes before optimum
performance is obtained. If an over or under range condition is present
on the pH channel there is probably an air bubble trapped in the
reference sensor. Remove the sensor and tap it until the air bubble has
been dislodged. Re–install the sensor.
Figure 3-24. Trapped Air Bubble in Reference Sensor

Replacing the Bottle Tubing

Equipment: Bottle tubing kit (Cat. 673250).
1. Drain the 248 and stop the system, Page 3-9.
2. Disconnect the three sets of bottle tubing from the manifold.
3. Install the new bottle tubing.
NOTE:
the Spares box.
4. Replace the Buffer Pack and Wash bottle:
5. Lower the front cover and press * to restart the 248.
6. Prime the 248, Page 3-9.
f. Carefully clean off any excess fill solution using clean, lint-free
tissue and deionized water. Push the clot removal line through
the vent hole to clear any fill solution crystals.
good condition.
Press the bottom of the sensor into position. Make sure all the
sensors are seated correctly, then push the tensioner firmly home to
make a good seal. Lower the block cover, snapping it into place.
calibrates on return to the Ready screen.
Following a change of reference sensor cassette it is normal for
If you break or lose a bottle tubing connector there is a spare in
a. Feed the bottle tubing into the neck of the bottles and into the solution.
b. Tilt the top of the bottle slightly away from you and slide into position.
c. Press the cap firmly onto the neck of the bottles.
Vent Hole
Trapped Air Bubble
Page 3-21