HovaCAL® CALIBRATION GAS GENERATOR
HovaCAL® – the allrounder
HovaCAL® stands for Hot-Vapor-Calibration and is used to produce precise gas-vapor mixtures for checking gas analysers and gas metering systems. Using the HovaPOR special evaporator technology, HovaCAL® can evaporate and mix with carrier gas not only water, acids and alkalines, such as HCl, NH3, HF and HgCl2 but also organic solutions, continuously and without pulsations.
HovaCAL® works according to the principle of continuous dosing and dynamic evaporation of liquid and mixing in of carrier gas. The concentration of the gas-vapor mixture is determined through the precise dosing of liquid and gas, as well as complete evaporation in the HovaPOR evaporator.
HovaCAL® is available in different versions, depending on the application and purpose of use. For mobile use in emission monitoring, HovaCAL® consists, for example, of a supply unit and the evaporator. The supply unit is used to dose liquid and gas, as well as control and monitor the temperature of the evaporator. Mass flow meters and controllers are used to dose the medium. The liquid flow rate can also be controlled gravimetrically or volumetrically.
The HovaPOR evaporator is connected to the supply unit by lines for carrier gas, liquid and electricity to the supply unit and can therefore be set up or installed separately from it. The outlet of the evaporator can be connected to a heated pipe or directly to the gas analyser or sampling system. The accuracy and reproducibility of the resulting gas-vapor mixture are ensured by a high-precision gas mass flow controller and liquid dosing pump. And when it comes to operation, there's the easy-to-use viewCAL software.
HovaCAL® can also be used as a gas dilutor and gas mixer, in order to set cylinder gases such as SO2, CO, CO2, NOx, O2 etc. to the desired concentration. Moreover, it's possible to humidify this gas mixture to a defined degree over a broad humidity range. This gives us test gases which are very similar to the measuring gas in its complex composition, yet are defined and controllable.
Due to the elevated temperature of the resulting gas-vapor mixture, it is possible to specifically avoid adsorption and corrosion effects and thus significantly reduce the gas response time.