Introduction AX300-I
Teledyne Analytical Instruments 12
1.4 Applications The AX300-I analyzers is intended for spot checking concentration
of oxygen in a gas mixtures used in medical applications such as
Anesthesia, Respiratory therapy and is intended for adult, pediatric and
Neonatal populations.
These instruments may be used in verifying oxygen concentrations
in gas mixtures used in:
• Anesthesia
• Respiratory Therapy
• Neonatal Care
1.5 Theory of Operation The AX300-I analyzer can be divided into two major functional
groups:
• R17MED Oxygen Sensor
• Signal Processing
The analyzer uses Teledyne Analytical Instruments Patented
R17MED oxygen sensor. The millovolt output signal from the sensor is
fed into the electronic signal processor, where it is used to calculate the
oxygen gas concentration and display it on the LCD screen. There is no
concentration alarm in the AX300-I analyzer however a unique sensor
fail/disconnect alarm is incorporated to warn the user of a sensor
problem. The√ SENSOR indicator is illuminated on the LCD and the
audible and visual alarms are activated whenever a fault is detected.
1.5.1 Sensor The AX300-I uses the Teledyne Class R17MED disposable oxygen
sensor. The sensor is made up of a sensing cathode and anode (fuel)
immersed in electrolyte and packaged in a small plastic container.
Oxygen entering the sensor reacts with the anode and a proportional
current is collected at the sensing cathode, which is sent to the
electronics where it is converted into a digital signal and displayed on
the LCD Screen.
Attached to the R17MED sensor is a removable plastic diverter.
This diverter is used to facilitate the transport of gas mixtures through