The Vaisala Ozone Interface OIF411 has five measurement channels and is powered by the radiosonde battery. Two channels are dedicated to the ozone sensor current and ozone pump temperature measurement, providing the data for ozone partial pressure calculation.

OIF411 provides two diagnostic tools for the ozone pump: battery performance can be monitored with the pump voltage measurement, and pump performance with the pump motor current. These measurements are useful in verifying that the ozone sensor is functioning properly and that ozone measurements are valid.