Maintaining the System Page 3-19
Replacing the Reference Sensor Cassette
BIOHAZARD: See Appendix A, Protecting Yourself from Biohazards.
Equipment: Reference sensor cassette (Cat. 478498) as required;
Reference inner (Cat. 478509) as required; disinfectant (for example,
Cat. 673390); clot removal line (Cat. 478645).
1. Use the Disinfect routine and stop the 248 system, Page 3-8.
2. Raise the front cover.
3. Slide the measurement block catch down and raise the block cover.
Figure 3-19. Opening the Measurement Block Cover
4. Swing and hold the tensioner to the right and remove the reference
sensor.
Figure 3-20. Removing the Reference Sensor
5. Replace the reference sensor cassette:
CAUTION: Make sure you use reference fill solution. Do not use pH
sensor fill solution.
a. Break the top off the reference fill solution container, and fit the
needle.
b. Slowly inject solution into the internal reference compartment of
the new cassette. Continue filling until the liquid level is flush
with the sensor reservoir.
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