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8.3 O
2
Sensor Specifications
Total accuracy*:.....................±3% actual oxygen level over full operating temp range
Oxygen Measurement Accuracy ........................................ ±1% oxygen
Linearity................................... ± 1% at constant temperature and pressure
Error Over Operating Temp Range .............................. ±3% oxygen, maximum
Response Time to 90% of Final Reading*..................... @ 77°F (25°C) ≤20 seconds
Storage Temperature Range ............................... 5°F to 122°F (-15°C to 50°C)
Expected Useful Life .................. 1,500,000 O
2
% hours (approx. 2 years average use)
*The accuracy of the oxygen monitor is not affected by supply gas inlet pressure to the blender,
however, pressures below 50 PSIG may result in a longer response time.
Note: All specifications assume the following standard environmental conditions unless
specified otherwise.
»
Ambient and sample gas temperatures of 77°F (25°C)
»
Barometric pressure of 30 inHg (102 kPa)
»
Ambient relative humidity of 50%
»
Sample gas relative humidity of 0%
9.0 FACTORS INFLUENCING CALIBRATION
9.1 Temperature Effect
The MAXBlend2 Monitor will hold calibration and read correctly within +/-3%
when in thermal equilibrium within the operating temperature range.
The device accuracy will be better than +/-3% if operated at the same
temperature at which it was calibrated. The device must be thermally
stable when calibrated and allowed to thermally stabilize after experiencing
temperature changes before reading is accurate. For these reasons, the
following is recommended:
1. Allow adequate time for the sensor to equilibrate to a new ambient temperature.
2. For best results, perform the calibration procedure at a temperature close to
the temperature where analysis will occur.
9.2 Pressure Effect
Changes in barometric pressure can affect the oxygen reading. A 1%
change in the barometric pressure results in an error of 1% of actual reading
(Example: If you are reading a 50% oxygen mix and the barometric pressure
drops from 30kPa to 29kPa, the reading will drop to: 50% x (29/30) = 48.3%.
Maxtec recommends that you re-calibrate after changing point-of-use elevation
by more than 500 feet (150m).
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