The ozone sensor unit is either of the following:
- Science Pump Corporation (SPC) Model ECC-6A ozone sensor
- EN-SCI, former Droplet Measurement Technologies (DMT) Model Z ozone sensor
The sensors are based on chemical reaction cells. The type of the sensors is electrochemical concentration cell (ECC). Air is sampled flow (by using a pump) and it goes to a reaction cell, in which the sampled ozone reacts in a solution, and the current developed in the reaction is detected and measured with an ozone interface. The ozone sensor units are thoroughly discussed in the sensor manufacturers’ manuals (see Table 1) and Performance Review Literature listed in Table 1.
The main parts of an SPC ECC-6A ozone sensor are seen in Figure 1. Model Z ozone sensor is similar to the SPC sensor. Refer to the sensor manufacturer’s manuals for more detailed information.
Note that the anode and cathode cells are in a different order in the ECC-6A and Model Z, see Figure 2.