S/5 Airway modules
Document No. 800 1005-1
9
Patient Spirometry sensor, D-lite
Patient Spirometry is measured with a specific sensor, D-lite or Pedi-lite.
D-lite and Pedi-lite sensors are designed to measure kinetic pressure by two-sided Pitot tube. The
pressure reduction caused by measuring cross is taken into account, too, especially in small flows.
Velocity is calculated from pressure difference according to Bernoulli's equation. Flow is then
determined using the calculated velocity.
v =
2
dP
×
ρ
(from Bernoulli's equation)
F = v A
×
,
where,
F=flow (l/min)
v=velocity (m/s)
A=cross area (m
2
)
dP=pressure difference (cmH
2
O)
ρ
=density (kg/m
3
)
Finally the volume information is obtained by integrating the flow signal.
2.2
Main components
The airway modules consist of ACX-200 and OM-101 gas measuring units, ASX-200 agent
identification unit (G-AiO/AiOV), PVX board (G-OV/AiOV/AOV), gas sampling system, ACX
measuring board and gas mother board.
Oxygen
Measuing
Unit
X2
X4
X8
X9
X1
X5
X10
X12
X7
X11
Module
Key
Pump
Valves
Fan
Regulator
Gas Module CPU
Lamp
Driver
Valve
Driver
Pump
Driver
ACX
Board
ACX
Bench
ASX
Unit
O2
signal
Lamp
Supply
Voltage
+24/+32 VD
Valve controls
+15 VD, GNDD
+15 VD
Pump control
+15 VD, GNDD
+15 VD
Mod key in
+15 V
+5 Vref
Serial I/O
Serial I/O
+5 V
+5 VL
+15 VD
+/-15 V
+24 /+32 VD
GND
GNDD
Supply
voltages
Valve
controls
ACX
serial
I/O
Supply
voltages
Supply
voltages,
Control
Signal out
Lamp
control
+5 VL
GND
GNDD
Supply
voltages
ASX
serial
i/O
Gas Mother Board
+5 V, GND
ACX, ASX,
PVX serial
I/O
Lamp
control
Pump control
Mod key in
GND
X3
Supply
voltages
PVX
serial
i/O
PVX
Board
Gas pressure
and flow in
X1
X1
Figure 4
Airway module block diagram
Summary of Contents for S/5 B-GAS
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