- Carrier gas : synthetic air (5.0 purity) with controllable relative humidity (RH: 0–90%) and flow (10–200 ml/min);
- Test gases: CO, CH4, NO2, H2S, NH3, SO2
Flow system is used to dose different target gas concentrations under dynamic regime. It consists of eleven individual channels (dry synthetic air, humid synthetic air, NO2, CO, CH4, NH3, H2S, SO2). Every channel is equipped with one mass flow controller (MFC) and two solenoid valves which are computer controlled via D/A cards. Desired gas concentrations (from ppb to ppm level) are obtained by appropriate adjustment of carrier/target gases. In order to avoid any possible channel contamination, corrosion, or outgassing, high quality materials (Swagelock stainless steel tubing and fittings, Kalrez, Teflon, glass tubing) are used.
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