Page 3-8 248 Operator’s Manual
Using the Disinfect Routine
BIOHAZARD: See Appendix A, Protecting Yourself From Biohazards.
CAUTION: Disinfectant should be used in accordance with the
manufacturer’s instructions.
We have tested the following disinfectants for compatability with our sensors:
• 2% activated glutaraldehyde solution
• 1% or 2% Virkon
• 10% v/v bleach
2% activated glutaraldehyde solution has no detrimental effect on the
sensors, and is available from Siemens as Cat. 673390.
CAUTION: Both Virkon and 10% v/v bleach affect the reference sensor.
To prevent damaging the reference sensor if you use either of these two
disinfectants, you must remove it and replace it with an old sensor.
Alternatively, use a Test blank sensor - ref (TB5), Cat. 673396000.
Equipment: Bleach or Virkon or Activated glutaraldehyde solution
(Cat. 673390); Test blank sensor (Cat. 673396000) as required.
The Disinfect routine allows disinfectant to be pumped through the
probe and sample path and left in place for 10 minutes. It should be
carried out before replacing the pump tubing, sensors or the probe and
tubing. It should also be carried out after analyzing a sample known or
suspected to contain dangerous pathogens.
NOTE: To prevent protein fixation, we recommend deproteinizing the
system (Page 3-7) before using the Disinfect routine.
1. From Ready press # for menu, 2 for Maintenance and 4 for Disinfect.
2. Following the instructions on the screen, lift the probe to the first
position and present the disinfectant.
Hold the solution in place until prompted to remove it, then close the probe.
3. The Disinfectant is left in the measurement block for 10 minutes, and
the screen shows the time remaining. When the routine is finished, the
248 washes and will calibrate on return to the Ready screen.
You can cancel the Disinfect routine to measure a sample by pressing *.
The 248 washes and will calibrate on return to the Ready screen.
4. You can remove the probe and tubing and measurement block
tubing, Page 3-24, and sample pump tubing, Page 3-13, and soak
for 10 minutes in 10% v/v bleach.
CAUTION: Always observe good laboratory practices when handling any
component of the 248 under biohazardous conditions.
Siemens
is unable to
accept responsibility for the effectiveness of the disinfectant used or of
the Disinfect routine.
Stopping the 248 System
This routine suspends instrument functions, for example, calibrations,
while you are carrying out routine maintenance such as changing the
reagents, sensors, tubing, gas cylinders and pump tubing, or while
clearing blockages.
If Beeper On is selected (see Page 5-6, Changing Beeper Option) the 248
will beep after 30 minutes in Stop System. Press # to cancel the beeper.
Do not leave the 248 system stopped for longer than necessary, as this
may damage the sensors and pump tubing.
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