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With the FlowAnalyser PRO two new settings regarding the pressure were introduced.

The first setting is called Ventilation parameter pressure source. The second setting is called Dynamic pressure compensation. They are both available via the main menu -> settings -> measurement.

Ventilation parameter pressure source

With this setting, the reference pressure for the respiratory parameters can be selected. Three options are available: Pressure in Flow (default), Pressure Difference High and Pressure Difference Low.

As an example, by selecting Pressure Difference High and connecting the corresponding positive differential pressure port to the inside of a test lung, the peak pressure PPeak or other ventilation parameters could be determined inside the test lung. Furthermore, the gas standard and the trigger use the selected pressure as reference.

 

Dynamic Pressure Compensation

The pressure sensor Pchannel inside the flow channel of the FlowAnalyser PRO is located in front of the mesh. The mesh is used to generate a pressure drop from which the flow can be calculated. More about the mesh as a measuring principle can be found here https://biomedical.blog/flow-measurement-with-pneumotachograph/

When the Dynamic Pressure Compensation setting is enabled, a virtual pressure is calculated, to be found downstream in the device (hence the measurement is independent of the orientation of the device.). This replicates the behavior of the FlowAnalyser. When the Dynamic Pressure Compensation setting is disabled, the displayed pressure value is the value which is measured by the pressure sensor in the flow channel.

The Dynamic Pressure Compensation setting affects the displayed PChannel value. Since the pressure trigger threshold is set based on the displayed PChannel value, the trigger also uses the compensated value, if the setting is active. No Respiratory parameters or gas standards are affected by this setting.

 

The Dynamic Pressure Compensation setting for the pressure trigger threshold is only considered if the pressure source is set to Pressure in Flow. It has no effect on pressure measurement via one of the Pressure Difference sensors.

 

 

Table 1: Table shows if there are dependencies existing

 

Ventilation Parameter Pressure Source

Dynamic Pressure Compensation

Reference Pressure for gas standard

Linked

No dependency

Reference Pressure for Respiratory Parameters

Linked

No dependency

Reference Pressure for Trigger

Linked

Linked

Pressure Channel Display

No dependency

Linked

 

 

 


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