December 14, 2008
Espresso Machines Explained
Understanding the features and workings of your espresso machine.An espresso machine is, quite simply, a hot water boiler and steam generator with one or more integral, pressurised, coffee brewing points. With the emphasis on maintaining an optimum brewing temperature the machines is designed to produce 1-1.5 fluid ounces of concentrated coffee liquor, by forcing hot water at a temperature of between 92-96 degrees Celsius at a pressure of 9 bar (130psi) for a duration of between 20-25 seconds.Inside the machineBoiler - A typical semi or automatic espresso machine comprises of a boiler (or boilers) to generate hot water at approximately 96 degrees Celsius and steam at about 120 degrees. This is achieved by an electrical heating element and heat exchangers which transfer the heat from the main boiler to fresh mains water as it is required at the point of brewing.Pump - This takes water from the mains supply (or integral tank) and passes it through the heat exchangers to the point of brewing operating at a pressure of 9 bar.Electronics - Various electronic pressure and temperature values and switches to ensure a safe operation.There is no
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