GS corpuls3 - Page 270

Procedure in case of malfunctions User Manual corpuls
3
258 ENG - Version 2.1 – P/N 04130.2
Malfunction Troubleshooting Explanation/corrective action
Environmental temperature
changes rapidly.
 The output of the photo detector drifts due
to the rapid temperature change.
 Wait until the photo detector temperature
stabilises.
Measured ETCO
2
value is lower than the
true value
Patient breathing is very
rapid and/or irregular.
The measured value may be inaccurate
because the patient respiration rate is
beyond the sensor performance.
CO
2
is mixed with the
inspiration.
capONE measurement is based on the
assumption of no CO
2
gas in the inspiration
(semi-quantitative method). Therefore,
when CO
2
gas mixes in the inspiration, the
measured value will be lower than the true
value. If the inspiration contains e. g.
1 mmHg of CO
2
gas, the measured ETCO
2
value will be 10% less than the true value.
Extremely low ventilatory
volume.
 Due to the dead space (1.2 mL), CO2
may mix in the inspired air of patients with
low ventilatory volume.
 capONE measurement is based on the
assumption of no CO2 gas in inspiration
(semi-quantitative method). Therefore,
when CO2 gas mixes in the inspiration,
the measured value will be lower than the
true value.
Measurement is performed
in a low pressure
environment, such as high
altitude.
cap-ONE is affected by atmospheric
pressure. For every 15 hPa decrease in
pressure, the measured value is 1 mmHg
lower than the true value.
Measured ETCO
2
value is higher than
the true value.
Simultaneous use of an
anaesthesia measuring
instrument with volatile
anaesthetic agents.
capONE is affected by volatile anaesthetic
agents and produces a higher value than
true value. The difference from the true
value is as follows:
Gas Concentration Difference
Halothane 4% +1 mmHg
Enflurane 5% +1 mmHg
Isoflurane 5% +2 mmHg
Sevofluran 6% +3 mmHg
Desflurane 24% +7 mmHg
Dry mixed gas with 5% (38 mmHg) CO
2
-
and N
2
-balance, under 1 kPA
N
2
O anaesthesia is used. capONE is affected by N
2
O gas and
produces a higher value than the true
value.