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Since pH samples are frequently capillary tubes with insufficient sample volume,
the system requires you to move the sample manually to the measurement module.
If the sample device is a syringe that contains sufficient volume for analysis, the
system positions the sample automatically. The following table lists the minimum
sample volumes required by each system to determine pH:
840, 844, 845 35 µL
850, 854, 855 70 µL
860, 864, 865
95 µL
NOTE: When you select pH only, the system measures everything except pCO
2
and pO
2.
On systems with the CO-ox module, the system measures everything
except pCO
2
, pO
2
, and tHb parameters.
BIOHAZARD: Refer to Appendix A, Protecting Yourself from Biohazards, for
recommended precautions when working with biohazardous materials.
CAUTION: Insert the fire-polished end of the capillary tube into the sample port to
prevent damage to the capillary seal.
1. Prepare the sample and insert the device in the sample port. Figure 2-9 shows
a capillary sample in the sample port.
Sample Port
Capillary Sample
2. Press Change Sample Type.
The Sample Type menu appears, as shown in Figure 2-10.
!