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6.3.3 Low Flow
2
The Low flow connection is used to measure small flow rates. In
order to calculate respiratory parameters using this measurement
channel, the tr
igger must be set to “infant”. Thereby, the positive
interface from the differential pressure sensor will automatically be
used as the pressure sensor. The T-Piece with the connection tube
can be used to connect these two interfaces.
Range: ± 20 sl/min
Accuracy: ± 1.75% of reading or 0.04 sl/min
2
Standard liter per minute (calculated using STP conditions of 21°C and 1013 mbar)
Low flow
There are no additional sensors in the low flow
channel to measure temperature, humidity, or O
2
concentration which have an impact on flow measurement.
To achieve very accurate measurements it helps if the back
end of the low flow channel is connected to the high flow
channel. On this way the additional values can be measured.
For Flows higher than 20 sl/min the measurement is not
accurate anymore.