The NOx reagent solution is stable for at least one month at room temperature, whereas the other solutions are stable for several weeks at 4 °C in the dark. Calibration ranges for the different instruments are given in Table. 2.
The NOx reagent solution is stable for at least one month at roomtemperature, whereas the other solutions are stable for several weeksat 4 °C in the dark. Calibration ranges for the different instruments aregiven in Table. 2.