Fluke Biomedical VT305 - Manual (Page 53)

Gas Flow Analyzer
Measure Respiratory Data
39
Connection to the Respiratory Apparatus
There are three different methods to connect the Product
to the respiratory apparatus:
• Downstream of the Y-piece
Ventilator
Fluke VT305
Test Lung
gyo038.eps
• In the inspiration duct upstream of the Y-piece
Ventilator
Fluke VT305
Test Lung
gyo039.eps
• In the expiration duct upstream of the Y-piece
Ventilator
Fluke VT305
Test Lung
gyo040.eps
Standard Trigger Values
Because the Product can measure flow in each direction, it
makes sense to use the first connection method. In this
measurement setup, flow is usually chosen as the trigger
value. Flow triggers are stored as standard values in the
device and can be reset when necessary. The standard
trigger values for the flow trigger for adult breathing, for
example, are:
Starttrigger: Flow > 3 l/min
Endtrigger: Flow < -3 l/min
With the second and third connection methods, pressure is
usually chosen as the trigger signal. In this case the
standard values are as follows:
Starttrigger: Pressure > 1 mbar
Endtrigger: Pressure < 1 mbar
Baseflow
The base flow is the constant flow that must be ignored
when you calculate volume. If there is an identified
leakage in the system, like a constant discharge of 3 l/min