Model SO
$259.00
Model MO-200
$369.00
- View Specs/Manuals
- 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.
About Apogee Oxygen Sensors
Our Oxygen Sensors are galvanic cell sensors that have a lead anode, a gold cathode, an acid electrolyte and a Teflon membrane. The current flow between the electrodes is proportional to the oxygen concentration being measured. An internal bridge resistor is used to provide a mV output. Being a galvanic cell type Oxygen Sensor, a small amount of oxygen is consumed in the reaction in order to produce the current flow and subsequent mV output. The oxygen consumption was measured to be 2.2 μmol O2 per day when the O2 concentration was 20.95 percent (3240 mmol) at 23 C.
The mV output responds to the partial pressure of oxygen in air. The standard units for partial pressure are kPa. However, gas sensors that respond to partial pressure are typically calibrated to read out in mole fraction of the gas in air, which has units of moles of oxygen per mole of air. These units can be directly converted to percent O2 in air or ppm O2 in air.
Gas sensors read out in percent because this value does not change with temperature or pressure. The concentration of oxygen in our atmosphere is 20.95%, and this value, to 4 significant digits, has not changed for decades. This means that we are surrounded by calibration gas for this sensor (provided you are not breathing on the oxygen sensor when it is being calibrated. Our exhaled breath is about 17 percent oxygen).
