100%
50%
10%
1.0% Τ 0.1% Τ 0% Τ
% TRANSMITTANCE % Τ CONVERTED TO ABSORBANCE
GILFORD DIRECT ABSORBANCE 0.000 A
1.000 A
2.000 A
3.000 A
Gilford Spectrophotometers utilize a unique principle to measure Absorbance d i r e c t l y . The second and third decades, severely compressed in %—transmittance instruments, are fully expanded in Gilford Instruments—for equal accuracy and resolution throughout the complete range. Absorbance is presented digitally to 0.001 A -from 0.000 A to 3.000 A or it can be readily recorded. Concentration is measurable directly over a 1000:1 range.
Add TWO usable decades and 0.001 A resolution t o your " o l d " spectrophotometer Combining Gilford photometric elements with your old monochromator can convert your present instrument into a research quality spectrophotometer superior to most presently available systems—and at mod erate cost. Recent advances in electronics permit measurement of light with a sensitivity not previously possible. In contrast, except for minor improvement in materials, the per formance of quality optical systems has re mained essentially unchanged for many years. You can now have a new, precision spec trophotometer of unsurpassed sensitivity over the entire range from 0.000 to 3.000 A b s o r b a n c e u n i t s (A) with resolution throughout of 0.001 A. Exceptional stability
- d r i f t less than 0.005 A per hour. Wavelength range from 200 to 700 millimicrons. This versatile instrument is convenient for single-sample measurements, for con tinuous monitoring, for repeated clinical or industrial quality-control testing. It gives a 4-place digital readout in Absorbance — or the output signal may, if desired, be fed into any standard linear chart recorder. Only two controls. Eliminates shutter and dark cur rent adjustments. Completely line-operated. NOTE: The Gilford Model 200 Spectrophotometer can also be purchased complete with Monochro mator and Dual Lamp Source. Other compatible accessories and attachments are available for automating many laboratory procedures. Send for specifications and quotation.
Gilford Instrument Laboratories Incorporated • Oberlin, Ohio 44074
gilford
model 2 0 0
SPECTROPHOTOMETER Circle No. 44 on Readers' Service Card 20 A
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ANALYTICAL CHEMISTRY
