GE HEALTHCARE E-PSMP, Technical Manual

Page: 258 / 622

Module Frames and Modules
8 - 8
2062973-004
1.3.2 Gas sampling system
The gas sampling system draws a 120ml/min sample from the patient's airway to the
module. The sampling system also takes about 30ml/min flow of room air to the oxygen
sensor. When the gas sensors are zeroed, room air is taken through the CO
2
-absorber to
the gas sensors instead of the sampled gas from the patient's breathing.
The gas sampling line is connected between the patient circuit and the Gas Sample port
on the water trap. The water trap protects the sampling system and gas sensors from
liquids and dust.
The diagram of the gas sampling system is shown in the figure below:
Figure 7 Gas sampling system
The sampling system has a self diagnostics that detects disturbances in the gas flow, reveals
the most common reasons for disturbances, such as occluded sampling line or blocked gas
exhaust line, and communicates relevant status messages to the patient monitor.
The system is designed so that gas the sampled gas will not flow from the sampling line back to
the patient circuit. The parts and connections of the sampling system are streamlined for
minimal dead spaces and turbulences in gas flows.
All gas inputs of the module have dust filters protecting the sampling system and gas sensors.
The water trap acts as a dust filter for the sampled gas and the module should always have the
water trap connected.
NOTE: It is very important to prevent dust from entering the open gas connections during
service operations.
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