1.4 MAX-250+ Oxygen Sensor
The MAX-250+ oxygen sensor offers stability and extra life.
The MAX-250+ 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. Concurrently, oxidation occurs electrochemically at the lead
anode, generating an electrical current and providing a voltage output. Electrodes
are immersed in a unique gelled weak acid electrolyte which is responsible for
the sensors long life and motion insensitive characteristic. 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
electrochemical reaction and therefore, negligible current is produced. In this
sense, the sensor is self-zeroing.
CAUTION: The Maxtec
®
MAX-250+ oxygen sensor is a sealed device
containing a mild acid electrolyte, lead (Pb), and lead acetate. Lead and lead
acetate are hazardous waste constituents and should be disposed of properly,
or returned to Maxtec
®
for proper disposal or recovery.
CAUTION: Do not immerse the sensor in any cleaning solution, autoclave or
expose the sensor to high temperatures.
CAUTION: Dropping sensor can adversely affect its performance.
Do not throw away. Dispose of properly in accordance with local regulations.
2.0 OPERATING INSTRUCTIONS
2.1 Getting Started
2.1.1 Protect Tape
Prior to turning on the unit, a protective film covering the threaded sensor
face must be removed. After removing the film, wait approximately 20
minutes for the sensor to reach equilibrium.
2.1.2 Automatic Calibration
After the unit is turned on it will automatically calibrate to room air. The
displayshouldbestableandreading20.9%.Tochecktheoxygenconcentra-
tion of a sample gas: (after the unit has been calibrated)
3
W W W . M A X T E C I N C . C O M
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