A steam quality process monitor system and method includes a temperature sensor, a pressure sensor, a processor and memory configured: to determine a steam quality value of an input steam supply based on a reading of the temperature sensor and a reading the pressure sensor; continuously update the steam quality value; and a machine that accepts the input steam supply and is at least partially controlled by the steam quality value. A steam quality process monitor system and method includes a temperature sensor, a pressure sensor, a processor and memory configured: to determine a steam quality value of an input steam supply based on a reading of the temperature sensor and a reading the pressure sensor; continuously update the steam quality value; and a machine that accepts the input steam supply and is at least partially controlled by the steam quality value.