SPATIAL
SCAN
true double-beam quantitation of TLC by direct scan:
FARRAND® VIS-UV Chromatogram Analyzer Specifications Spectral Range: 200 to 785 nm or 215 to 800 nm Spectral Resolution: 10 nm with standard slits; other bandwidths available. 0.5 to 20 nm slits optional. Spatial Resolution: 0.5 mm with standard slits. Automatic Y-Axis Scan: 8 in. nominal with 9 scan rates from 0.4 to 12 in./min. X-Axis Scan, Manual: 8 in., with graduated dial for precise positioning. Sample Holder: accepts plates in sizes from 8 x 8 in. to 1 x2 in., glass, paper, plastic, and flat gel media. Thickness to 1A in. Compartment is totally light-tight. Sample Illumination: adjustable by means of slit masks. Recorder Chart Drive: 21 chart speeds, from 1/120 to 12 in./min., synchronous with chromatogram scan motion. Stable Photomultiplier Detection Systems: one each for reference and sample beams. T h e versatile, precise Farrand VIS-UV C h r o m a t o g r a m A n a l y z e r — t h e only instrument w h i c h excels in t h e UV as w e l l as V i s i b l e a n d in F l u o r e s c e n c e as well as Densitometry. A n d t h e only i n s t r u m e n t w i t h this c o m b i n a t i o n of o u t s t a n d i n g features: •
D o u b l e - b e a m ratio system for i m p r o v e d b a c k g r o u n d d i s c r i m i n a t i o n and c o m p e n s a t i o n of lamp-intensity variations.
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D o u b l e s i d e b a n d reference beam illuminating both sides a d j a c e n t to s a m p l e line to provide more accurate quantitation.
D Built-in digital readout for q u i c k - r e a d i n g q u a n t i t a t i o n by e l e c t r o n i c integration of r e c o r d e d c u r v e . D M e a s u r e m e n t by d i r e c t a b s o r p t i o n , by l u m i n e s c e n c e (fluorescence) q u e n c h i n g , and luminescence emission. • Densitometry m e a s u r e m e n t s by reflection m e t h o d s , l a b o r a t o r y - p r o v e d to achieve o u t s t a n d i n g repeatability a n d sensitivity. •
W i d e sensitivity range, d o w n to nanogram-level q u a n t i t a t i o n .
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A n d s u c h " e x t r a s " as dc x e n o n arc lamp, t w o g r a t i n g m o n o c h r o m a t o r s (one for e x c i t a t i o n —one for analysis), ratio recorder.
We w e l c o m e s i d e - b y - s i d e c o m p a r i s o n tests on y o u r samples with any other d i r e c t - s c a n i n s t r u m e n t t o prove t h e s u p e r i o r i t y of the F a r r a n d VIS-UV C h r o m a t o g r a m Analyzer. For f u r t h e r i n f o r m a t i o n , write — o r t e l e p h o n e . A n d be sure to ask us about our new leasing p r o g r a m that enables y o u to obtain instruments f r o m o p e r a t i n g f u n d s .
F A R R A N D O P T I C A L C O . , I N C . Commercial
FOCI ®
Products
Division
535 S o u t h 5th A v e n u e , M o u n t V e r n o n , N e w Y o r k 10550 T e l e p h o n e : 914-668-9393 Telex: 212-824-8038 Circle No. 44 on Readers' Service Card A N A L Y T I C A L CHEMISTRY, VOL. 4 2 , NO. 1 1 , SEPTEMBER 1 9 7 0
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