Model SO
$259.00
Model MO-200
$369.00
- View Specs
- Order Sensor
Model SO
$259.00
- Order Meter
Model MO-200
$369.00
- Diffusion Head
Model AO-001
$30.00
- Flow-Through Head
Model AO-002
$30.00
We currently have a 1 – 2 week lead time on all orders, but please feel free to call ahead for product availability.
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 percent O2 and the output signal of the fast-response unit is approximately 11 mV in ambient air, or 0.5 mV per 1 percent 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 percent 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 percent 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 percent in 24 hours.
Zero Offset
The mV output in ultra-pure nitrogen gas (0.000 percent oxygen) is typically ± 0.05 percent. 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.
