A modified bubbler sensor for the continuous recording of surface ozone

The surface ozone recorders developed at Poona use a Brewer electrochemical bubbler ozone sensor. Continuous recording with the sensor is possible if a constant level of solution can be maintained in the bubbler. In the Mark I surface ozone recorder this was achieved by incorporating a reservoir of KI solution which automatically siphons the solution into the bubbler. This resulted in changes in the response characteristics of the bubbler. In the Mark II bubbler gradual free mixing between the solution in the bubbler and the reservoir is made possible by enveloping the bubbler with the reservoir. The result is a simple, reliable, surface ozone recording system which requires attention only once in a week. The system is described in detail and sample records are presented.