Sierra Monitor Corporation T10008 - Manual (Page 14)

OXYGEN DEFICIENCY MONITOR PAGE 12
10. NOTICE
The enclosed replacement sensor for your Model 55 Personal Oxygen Monitor is an
enhanced version which will provide twice the operating life compared to sensors
shipped prior to September, 2004. The enclosed sensor will operate for two years.
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.
Thanks you for your confidence in Sierra Monitor Corporation gas detection products.