The SB-43A is a tin dioxide semiconductor gas sensor which has a high sensitivity to various freons with improved cross sensitivity to other gases. This model is suitable for R32, R410A, R407C, HFO1234yf and other new refrigerant gases. A significant feature of low power consumption design (120 mW) is advantageous for portable devices.
Gas sensitive semiconductor material is a mini bead type and a heater coil and electrode wire are embedded in the element. The sensing element is installed in the metal housing which uses double stainless-steel mesh (100 mesh) in the path of gas flow. This sensor has silicon poison proof silica filter.