| Parameter | Abbreviation | Unit | Description |
|---|---|---|---|
| Vaporized hydrogen peroxide concentration by volume | H2O2 | ppm | Parts per million value is a unit of H2O2 concentration per amount of air in volume fraction in units ppmv or m3/m3. |
| Relative saturation (RS) (H2O + H2O2) | RS | %RS | Relative saturation is a parameter that indicates the humidity value derived from the combination of water and hydrogen peroxide vapor. Relative saturation tells how close the measured environment is from the condensation point at given H2O2 vapor concentration. |
| Relative humidity (RH) (H2O) | RH | %RH | Relative humidity is a measure of water vapor only. |
| Temperature | T | °C | |
| Absolute hydrogen peroxide | a (H2O2) | mg/m3 | Absolute H2O2 concentration is defined as the mass of H2O2 vapor in a certain volume. |
| Absolute humidity (H2O) | a | g/m3 | Absolute humidity is defined as the mass of water vapor in a certain volume. |
| Water concentration by volume | H2O | ppm | Parts per million value is a unit of water concentration per amount of air in volume fraction in units ppmv or m3/m3. |
| H2O + H2O2 dew point temperature | Td (H2O + H2O2) | °C | Dew point is the temperature to which a gas sample must be cooled to reach condensation. At this point, measured water vapor pressure equals to water vapor saturation pressure. At the presence of H2O2 vapor, the actual dew point is dependent on the amount of both water and H2O2 vapor, and it differs from the dew point measured with a traditional humidity sensor. |
| Water vapor pressure | Pw | hPa | Water vapor pressure is a partial pressure of a gas that is a measure of thermodynamic activity of the gas’s molecules. |
| Water vapor saturation pressure | Pws | hPa | Water vapor saturation pressure tells the maximum vapor pressure of pure water at certain temperature. At saturation vapor pressure, water is in thermodynamic equilibrium, hence its liquid and solid phases are in equilibrium. |
| Water vapor saturation pressure (H2O + H2O2) | Pws (H2O + H2O2) | hPa | Water vapor saturation pressure in H2O2 environment tells the maximum water vapor pressure when H2O2 vapor is present. This parameter is dependent on temperature and H2O2 vapor concentration. |
The probe provides both digital and analog outputs.
- In digital output mode, the probe outputs all the measurement parameters.
- In analog output mode, the probe outputs the readings of two measurement parameters (one parameter in each analog output channel). These measurement parameters are chosen when ordering the probe, and you can change them using the Insight software, the Indigo80 handheld indicator, and via Modbus. The probe is also compatible with Vaisala Indigo transmitters, which provide the option of three analog output channels.