Siemens RAPIDLAB 248 Operator's Manual page 74

Page 3-36
Shutting Down the 248
3. Disinfect the manifold and bottle tubing, and drain the system.
4. Turn the gas cylinder valves clockwise to close the cylinders.
5. Disconnect the line cord from the power supply socket.
6. Remove the probe and housing and immerse in 10% v/v bleach for
7. Remove the pH, pCO
8. Remove the reference sensor, Page 3-19. If you are removing the
9. Wipe the measurement block to remove any reference fill solution.
10. De-tension the pump tubes.
11. Clean the drip tray.
12. Wipe the external surfaces with tissues and 10% v/v bleach.
To prevent damaging the reference sensor if you use
CAUTION:
Virkon or 10% v/v bleach, you must remove the sensor and replace
it with an old sensor, or a test blank sensor - ref (TB5)
Cat. 673396000.
a. Remove the Buffer pack and Wash bottle and replace with a
beaker of disinfectant. Do not remove the waste bottle.
b. From the Maintenance menu press 3 for Prime.
c. When the Prime routine finishes, remove the disinfectant and
replace with a beaker of deionized water.
d. Press 3 to prime the 248 again. This flushes the system with
water.
e. When the Prime routine finishes remove the beaker of water.
Place tissues under the bottle tubes to catch any drips.
f. Press 3 to prime the 248 again. This drains the system.
g. Remove the waste bottle and cap it.
10 minutes, Page 3-24. Rinse with deionized water, then gently
wipe dry. If necessary, grease the probe shaft lightly with the
grease supplied in the Spares box.
reference sensor from the 248 for more than 12 hours follow this
procedure to prevent damage to the Nafion inner:
a. Remove the electrode inner and store it in its container in
saturated KCl. Do not leave the inner out of solution for longer
than 10 minutes.
b. Shake out the remaining KCl solution from the sensor cassette
and rinse with deionized water. Flush the reference sensor
sample path with deionized water, and allow the cassette to dry.
(To reactivate the reference sensor follow the procedure for
installing a new sensor cassette.)
and pO sensors, Page 3-17.
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248 Operator's Manual