ZIROX Oxygen Probe SS31H Properties The main part of the oxygen probe SS31H is a potentiometric solid electrolyte cell (ZrO2 sensor). Due to different oxygen concentrations at the electrodes (ambient air at reference electrode) a voltage arises which is proportional to the logarithm of the oxygen concentrations. From the cell voltage the oxygen concentration at the measuring electrode can be calculated based on the NERNST Law. The SS31H is calibration-, drift- and maintenance-free. During measurements in reducing atmospheres falsifications of the gas composition do not occur from the cooling of the measuring gas in a suction line. The use of high-quality components and materials guarantees long-term stability. If the fuel gas composition is known, it is possible to calculate the air factor X, the CO-, CO2-, H2- and the H2O-concentration. These values can be generated with an external electronic units (e.g. ZIROX electronic unit E2000). Applications The SS31H serves the process control and combustion optimization in power and heating plants as well as in incineration plants. It is a part of controlling oxidizing and reducing furnace gases in ceramic industries and used in heat treatment applications of metallic materials (Measurement in protection and inert gases).

Sensor voltage Thermal voltage Mounting recommendation: stuffing box or