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changed using the ↑ and ↓ arrow keys. During calibration, the
"%" sign will flash at a once per second rate. When the
calibration value is set, pressing the CALIBRATE or
LOCK/UNLOCK key will cause the unit to exit the calibration
mode and return to normal operation. The unit will also revert to
normal operation if 10 seconds elapse and no keys are pressed.
↑↑
and
↓↓
Keys- The ↑ and ↓ arrow keys are used in
conjunction with the CALIBRATE key to calibrate the
unit. Pressing the ↑ or ↓ key will raise or lower the displayed
oxygen value in .1% increments. When either of these keys are
held down for more than 1 second, the display will scroll at a rate
of .4% per second.
Sample Inlet Connection
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.
1.3 MAX-250 Oxygen Sensor
MAX-250 oxygen sensors offer quick response, stability and extra life on
the order of 900,000 percent oxygen hours.
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.
7
C
CAUTION: Do not use ethylene oxide sterilization. Do not
immerse the sensor in any cleaning solution, autoclave or
expose the sensor to high temperatures.
CAUTION: Dropping or severely jarring the sensor after
calibration may shift the calibration point enough to require
recalibration.
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