Greisinger oxy 3690 mp atmospheric air oxygen transmitter including electrode greisinger oxy 3690 p the greisinger oxy 3690 mp is an atmospheric air oxygen transmitter including electrode that measures the oxygen concentration in air depending on the selected sensor type the device is appropriate to either pure oxygen i e low co sup2 concentration or to air with very high co sup2 concentration p p suitable for measurements in the atmosphere and in systems with little or no positive