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Bird Sentry™ Blender
B
Outlet Port
See Figure 1, letter O.
C
O
Sensor Port
2
A sampling port for the oxygen sensor. It allows 3 LPM of mixed gas from the blender to flow over
the sensor membrane. The port is located on the back side of the plate.
D
Medical Air Inlet Adapter
See Figure 1, letter P.
E
Oxygen Inlet Adapter
See Figure 1, letter Q.
F
Pressure Differential Reed Alarm Cap
An audible alarm that, when activated, indicates that a pressure differential of 20 PSI or more
exists between the two gas-source pressures.
Disposable Galv anic O
The sensor is a galvanic, partial pressure sensor that is specific to oxygen. It consists of two electrodes
(a cathode and an anode), a Teflon membrane and an electrolyte. Oxygen diffuses through the Teflon
membrane and immediately reacts at a gold cathode. Oxygen ions are transported in the unique
electrolyte solution to a lead anode where oxidation occurs, generating an electrical current. Since the
sensor is specific to oxygen, the current generated is proportional to the amount of oxygen present in
the sample gas. When no oxygen is present, there is no chemical reaction and therefore, no current is
produced. In this sense, the sensor is self-zeroing.
Figure 3 Disposable galvanic O
A
Disposable Galvanic O
A replaceable cartridge which contains the active elements of the galvanic oxygen sensor. When
exhausted, the cell is discarded and replaced with a new cell.
L1383 Rev. D
Sensor
2
cell
2
Cell (Refer to Figure 3)
2
Chapter 1: Introduction
5
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