Oxygen Sensor
The Oxygen Sensor measures the amount of Oxygen (O2) gas in air.
OUTPUT, ACCURACY, ZERO OFFSET,
& INFLUENCE FROM OTHER GASES
OUTPUT: The output signal of the Soil Sensor unit is approximately 50 mV in ambient air, or 2.4 mV per 1 % O2 and the output signal of the Fast-Response unit is approximately 11 mV in ambient air, or 0.5 mV per 1% O2.
The user must calibrate their Oxygen Sensor at their location, at their pressure, to establish the exact multiplier to convert the mV reading to % O2. For example, if the output was exactly 11.0 mV the multiplier would be 1.905 (20.95 / 11.0).
Absolute accuracy of the Oxygen Sensor depends on how often it is calibrated. To achieve the best accuracy, automated calibration with ambient air at least once each day is recommended. Typical drift rates are less than 0.05% in 24 hours.
ACCURACY: Absolute accuracy of the sensor depends on how often it is calibrated. To achieve the best accuracy, automated calibration with ambient air at least once each day is recommended. Typical drift rates are less than 0.05% in 24 hours.
ZERO OFFSET: The mV output in ultra-pure nitrogen gas (0.000 % oxygen) is typically ± 0.05%. Precise measurements of hypoxic and anaerobic conditions can be made by making a periodic zero calibration of the sensor with ultra-pure nitrogen gas. The zero offset for each sensor is highly reproducible and should be entered into the software after a zero-test.
INFLUENCE FROM OTHER GASES: The sensor is unaffected by CO, H2, and various acidic gases such as CO2, H2S, NOx, SOx. However, the Teflon membrane used in the sensor may be damaged by ozone.
$259
$30
Model SO-110:
Model AO-001:
Products >> Oxygen Sensors and Meters >> Technical Information >> Output, Accuracy, Zero Offset, and Influence from Other Gases