Measurement Principle
Monitoring Anesthetic and Respiratory Gases
6-4 Efficia CM Series Rack and Modules Instructions for Use
Measurement Principle
A sample line is connected between the Y-piece at the patient side and a water trap as
the input port of the Gas module. A pump draws the gas being measured through the
whole system.
The water trap prevents water and other fluids from passing into the gas analyzer and
causing contamination and/or internal occlusions. It has a water reservoir in which fluids
are collected and two water separation filters. The gas flows to the internal components
of the Gas module. The flow rate is set to 200 ml/min and is supervised. The gas output
port needs to be connected to a scavenging system or can be returned to the anesthesia
machine.
The Gas measurement module has an automated cyclical zeroing once a day (in error-
free operation) as well as automated barometric pressure compensation.
Figure 6-2 Side-stream gas measurement schematic
Gas module venting (internal fan) ensures that the oxygen concentration stays below 25
Vol% at a leak flow of 220mL/min oxygen into its case. A fan rotation error can be
detected.
Warning To avoid influence on the gas measurement and prevent damage to the water trap and
measuring system, do not spray the O-rings in the water trap housing with silicone spray.
Note: The water trap is for multi-patient use and must be replaced after a service life of four weeks
at the latest, during this time it can be emptied and reused as often as required. Regularly
check the level of fluid in the water trap and empty as required.
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