| Parameter |
How it is measured / determined |
| Sulfuric acid dewpoint temperature |
Sensor temperature at constant current |
| Flue gas temperature |
Measured using a probe-mounted thermocouple |
| Ambient temperature |
Measured using a temperature sensor in the probe handle |
| SO3 concentration |
Calculated from the H2SO4 concentration, water vapour concentration and flue gas temperature |
| H2SO4 concentration |
Calculated from the acid dewpoint temperature and the water vapour concentration |
| Toxic Release Inventory (TRI) |
Mass flow of H2SO4 emissions |
| Minimum Metal Temperature (MMT) |
Acid dewpoint temperature plus a user-adjustable offset |
| Rate of acid build-up (RBU) |
Corrosive potential of the flue gas at temperature below the acid dewpoint temperature, plotted on a graph |