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Beer Colorimeter at the Museum of American History!



Built Your Own 430nm Portable Spectrophotometer for SRM Demonstration

(part list and instructions coming soon)


Using easy to find parts you can build a portable SRM demonstrator!


6 x 430nm high intensity diode array illuminator - parts from Radio Shack $15  2 photovoltaic collectors "solar cells - from MCI $17


Solar cell light collection chamber lined with foil   Interior view with light chamber finished, batteries, switches, dig. meter and pots. wired


Sample compartment illuminated with ultra-blue light

Switches, zero, and calibration controls, digital meter.


Correlating output with calibration samples

In use testing - (sample tube not covered for stay light to show sample placement )

This device has been useful in demonstrating the SRM and the darkness/lightness of beer samples. It can be useful to show that beers of different colors will have the same or similar SRM-EBC values. When using the laboratory spectrometer for SRM determination you are using a monochromatic radiant source at, or close to, 430nm. As shown in the figured above, the spectral distribution of these diodes are broad and a precise 430nm light is not available. However the majority of the light transmitted through glass and an aqueous sample is a narrow band of 418-441nm, with a peak wavelength at 430nm, which works well for SRM determination.