Specification :

This meter is useful for monitoring soil respiration, aeration, and gaseous O2 levels in laboratory studies.
It has a galvanic cell sensor with 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 millivolt output. Being a galvanic cell type 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 micromoles ( ¼ mol) O2 per day when the O2 concentration was 20.95% ( 3240 mmol) at 23 degrees Celsius.
The mV output responds to the partial pressure of oxygen in air. The standard units for partial pressure are kilopascals ( 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 % 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 four significant digits, has not changed for decades. This means that we are surrounded by calibration gas for this sensor, provided you are not breathing
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AC-100 Communication cable is required for data download to a computer.on the sensor when it is being calibrated. Our exhaled breath is about 17% oxygen.
Each meter can store up to 99 manually recorded measurements. In automatic mode, measurements are made every 30 seconds and averages are stored every 30 minutes. Daily averages are also calculated