2: Setup and Operation
25
2.3.7
Flow Triggering
The auto-trigger feature for flow rate is internally established as the 20% point from the
minimum flow to the peak flow. For example, if the maximum flow rate is 80 L/min and
the minimum flow is 5 L/min then the auto trigger flow rate is set to (80 L/min – 5 L/min)
x 20% + 5 L/min = 20 L/min. If auto-triggering is not providing reasonable results,
consider using either manual flow or manual pressure triggering. To use manual flow
triggering, select the flow radio button and uncheck the "Auto-Triggering" checkbox.
Similarly, to use manual pressure triggering, select the pressure radio button. For a
breath to be detected, trigger settings must be set appropriately for the waveform of
interest. There are two suggested methods for determining the appropriate start and
end trigger values: 1) switch the Certifier FA Plus Test System to the graphing screen
and observe the flow or pressure readings at the start and the end of inspiration and 2)
observe the flow and pressure wave form from the ventilator being tested. For robust
flow and pressure triggering always set the "End Trigger" level lower than the "Start
Trigger". For example, a manual flow trigger setting may be +5 L/min for a start trigger
and -5 L/min for an end trigger setting. These numbers can be optimized based upon
your specific application.
www.
GlobalTestSupply
.com
Find Quality Products Online at:
www.
.com
1.800.561.8187
