Handheld sensing apparatus

摘要: A vapor sensing device that is sufficiently small and lightweight to be handheld, also modular so as allow the conveniently adapted for use in presence concentration of a wide variety specified vapors. The provides these benefits using sensor module incorporates sample chamber plurality sensors located on chip releasably carried within or adjacent chamber. Optionally, can configured plugged into receptacle formed device. Vapors are directed pass through chamber, whereupon provide distinct combination electrical signals response each. take form chemically sensitive resistors having resistances vary according identity an vapor. These each connected series with reference resistor, between voltage ground, such analog signal established resistor. resulting supplied analog-to-digital converter, produce corresponding digital signals. appropriately analyzed identification.