How does a spectronic 20 work?
The Spectronic 20, often called the Spec 20, is a spectrophotometer. A spectrophotometer measures the intensity of a light beam before and after it passes through a sample and compares these two intensities. The Spec 20 can measure absorbance and transmittance over a range of wavelenghts.
What spectronic 21?
Specifications & Description SPECTSPECTRONIC 21 Digital Model with UV Capabilities features linear digital readouts in % T, A, and concentration; push-button decimal selection; and an RS-232 interface port. Three-position sensitivity switch and the 100% T/zero A control let you select desired instrument gain setting.
What are spectrophotometers used for?
Spectrophotometry is a standard and inexpensive technique to measure light absorption or the amount of chemicals in a solution. It uses a light beam which passes through the sample, and each compound in the solution absorbs or transmits light over a certain wavelength.
What kind of light does Spectronic 20 use?
The Spectonic 20. The Spectronic 20 is a brand single-beam spectophotometer, designed to operate in the visible region of the spectrum across a wavelength range of 340 nm to 950 nm, with a spectral bandpass of 20 nm. It is designed for quantitative absorption measurement at single wavelengths.
How does absorbance work?
Absorbance is a measure of the quantity of light absorbed by a sample. If all light passes through a sample, none was absorbed, so the absorbance would be zero and the transmission would be 100%. On the other hand, if no light passes through a sample, the absorbance is infinite and the percent transmission is zero.
What limits the wavelengths available on the spectronic 20D +?
As shown in the schematic optical diagram (see left), polychromatic light from a source in the system passes through lenses which are reflected and dispersed by the diffraction grating to restrict the range of light wavelengths. This restricted range of wavelengths is then passed through the sample to be measured.
What is spectronic 20D+?
The Thermo Scientific Spectronic 20D+ Spectrophotometer is a single-beam digital spectrophotometer with a wavelength range of 340nm to 950nm. Specifications: – Spectral slit width: 20nm. – Wavelength range: 340 to 950nm. – Wavelength accuracy: ±2.5nm near 525nm.