Bausch and Lomb
Spectronic 20 Spectrophotometer
The Bausch and Lomb
Spectronic 20 spectrophotometer is a grating based
spectrophotometer, providing a single-beam 20 nm bandwidth in the
visible light region at a very reasonable cost. It quickly
a standard of the
industry and probably the most widely used spectrophotometer in the
The Bausch and Lomb
Spectronic 20 spectrophotometer is a line-operated single-beam
instrument. Radiation from the source (a tungsten filament lamp) is
dispersed by a replica grating, and the desired wavelength is
focused upon an exit slit. The emergent beam passes through the
cell compartment; that portion which is not absorbed is measured by
a phototube. The response of the phototube is recorded in terms of
transmittance (upper scale) or of absorbance (lower scale).
The wavelength control
is located on the right side of the top. Once it has been set to
the desired wavelength, this control is left undisturbed. The
effect of stray radiation is electronically eliminated with the
dark current control, located to the left. This control is adjusted
until the instrument records zero transmittance (or infinite
absorbance) when the cell compartment is vacant.
The light control,
located beneath the wavelength control, is adjusted until the
instrument records 100 percent transmittance (or zero absorbance)
with the blank in the light path.
The sample holder
accommodates special test tubes. The hinged top of the compartment
is raised, and the tube is gently but firmly seated inside.
Item is in good
Item powers up and the
needle moves to the right.
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Jason Rydell in San
Diego, CA, USA
Online Business name:
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