Siemens RAPIDLAB 248, Руководство оператора, Страница: 85 / 135

Measurement Block Routine
Cal Gas p CO
2
(mV) Slope Gas p CO
2
(mV)
Nominal mV –170.0 –151.0
Total pull in range -300.0 to +100.0 12.8 to 21.1 above
cal gas mV value
Action limits < -270.0 or >+80.0 <13.5 or >20.2 above
cal gas mV value
Cal Gas p O
2
(pA) Slope Gas p O
2
(pA)
Nominal pA +764.0 +80.0
Total pull in range 171 to 1961 above –100.0 to +250.0
slope gas pA value
Action limits <300 or >1600 above <–50 or >200
slope gas pA value
Action: pH - may be caused by the reference sensor, see Pages 4-1 and 4-2. If
problem persists condition or refill the pH sensor. If the problem is still
apparent, replace the pH sensor.
p CO
2
/ p O
2
- deproteinize/replace sensor
* at 760 mmHg atmospheric pressure, using standard gases (Cal: 5% CO
2
,
12% O
2
and Slope: 10% CO
2
and 0% O
2
)
4. Stability – for 7.3 Buffer and Cal Gas a typical sensor will show the
following performance:
pH p CO
2
p O
2
Noise - after 15 seconds
the display will not
change by more than:
0.2 mV/10 secs 1.0 mV/10 secs 2 pA/10 secs
Drift - after 15 seconds
the display will not
change unidirectionally
by more than:
1.0 mV 5.0 mV 15 pA
during the remainder of the measurement.
Instability on the pH channel may be caused by the reference sensor.
De-bubble the reference sensor and repeat the test.
5. Press * to cancel the test.
Run Test Sample
1. You can use the run test sample option to:
a. Measure a sample with a known mV value (for example, run 7.3
or 6.8 buffer as a sample).
b. Run QC samples to promote stability after installing a new
sensor.
NOTE:
You cannot use capillary samples with the Run Test Sample
routine.
Troubleshooting the System Page 4-11