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OXYGEN DEFICIENCY MONITOR PAGE 17
13. NOTICE – New 2-year Oxygen Sensor
Thank you for your order for a SPC21111 Oxygen Sensor Assembly for your Model 55 Personal
Oxygen Monitor. In this shipment you will find the new Sierra Monitor 2-year Oxygen sensor for
your Model 55 Personal Oxygen Monitor. This enhanced version will provide twice the operating life
compared to sensors shipped prior to September, 2004.
To insure maximum life of your new sensor, please perform the following test:
1. Install the new sensor.
2. Allow 1 hour of stabilization
3. In a clean air environment, turn the calibration adjustment to increase the reading to its
maximum value.
a. If the maximum reading exceeds 23% Oxygen, then the monitor circuit if OK.
Calibrate to 20.9% and return the monitor to normal use.
b. If the maximum reading is lower than 23%, but higher than 21.5%, the monitor is
safe to use, but the sensor life may be less than two years. The monitor may be
returned to Sierra Monitor for a NO COST upgrade to insure full sensor life.
c. If the maximum reading is less than 21.5% the monitor is not operating correctly
and should be returned to Sierra Monitor for repair.