ACUTRONIC fabian - Gas Blender Function

17 Technical specifications 94
fabian Therapy evolution | SW V5.1.x
Ref: 121003.EN / Date: 26Jan2021
Gas blender function
The Air/Oxygen Blender provides a gas blend with adjustable proportions of Oxygen and Air.
Gas from the central gas supply enters the device via the gas input connections.
Blending of the gases occurs via two proportional valves.
The proportional valves, which also act as return valves, prevent the return flow of a gas into the
supply cable of the other gas.
An Oxygen sensor measures the Inspiratory Oxygen Concentration.
Figure 17-1: Internal Gas Blending function of the fabian Therapy evolution
Air 2.0 to 6.5 bar
Oxygen 2.0 to 6.5 bar
Pressure Regulator
Proportional Valve connection
Calibration Valve
Calibrated Gas tube to O
2
Sensor
Pressure Sensor
Proportional valve
Filter
Internal Flow Sensor
To Manifold on Ventilator
Proportional Gas Blending PCB
Pneumatic Pressure Relief Valve
Proportional Gas Blending Block
The minimum base flow is 4 L/min in all modes except in O
2
Therapy.
Time till O
2
change is reached within Altera circuit set:
• up to 37 sec with default flow rate
• up to 75 sec with minimum flow rate
For more information, please refer to the “Technical Service Manual”