Measurement of SO2 in low concentrations
The challenge
It must be ensured that the temperature of the sample gas is above the gas dew point at every point during transportation.
Otherwise, condensation and partial loss of the component to be measured will occur.
The dew point is essentially determined by the water content of the gas and increases if the sample gas contains acidic components.
Solution
- Fluoropolymers are suitable both for temperature stability up to 250 °C and for chemical resistance to acidic components
- The accuracy of the measurement is significantly influenced by the permeability of the material – PTFE vs. PFA.
- The design of the heater is crucial for a good measurement result. A heated pipe transfers the heat indirectly to the medium through heat conduction – the closer the heating element is brought to the medium, the more effective the heating.
- Critical areas at the sample gas inlet and outlet, caused by larger masses due to fittings or electrical connections, must be taken into account by increasing the temperature input.
- Condensation of the sample gas can easily occur at unheated transition areas on the probe or analyzer. This must be counteracted by the use of insulation or transfer heaters.
USP’s
- Uniform heating over the entire length of the pipe
- No dew point undershoot in the connection area due to the use of insulation or transition heating
- The Quick-Lock quick coupling system guarantees seamless heating without cold spots