Computer Controlled, Double Beam, Ratio Recording, UV-Visible Spectrophotometers Resolution is the only difference between our two great spectropho tometers. The proven and popular Model 100-80 features a fixed 2 n m resolution while our new Model 110 offers variable resolution continuously from 0.2 nm to 4 nm. Both U.S.A. made models offer t h e same highly advanced and unique software package which provides methods unequaled and techniques of acquiring, processing and presenting photometric data. For more details write or call: Hitachi Scientific I n s t r u m e n t s , 460 E. Middlefield Rd. · Mountain View, CA 94043 · (415) 969-1100)
# HITACHI
See these instruments demonstrated at B o o t h s J31-32, K31-32, F A S E B '80
Nissei Sangyo America, Ltd.
A n a h e i m , Calif., April 14-17,1980
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ςSCIENTIFIC Π Ρ Μ Τ Ι Ρ Ι Γ IMÇTRI ΙΜΡΜΤς INSTRUMENTS
Analytical Instruments Department
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Sales and service in the U.S. for over 20 years through 12 locations in the U.S. and Canada. CIRCLE 154 ON READER SERVICE CARD
V E R I F L O designs and manufactures valves for high purity flow control from micrometering .._. — _. to automatic packless type shut-off JL *> DV28
DV20
series shut-off valve packless diaphragm seal type for corrosive fluids Maximum Pressure: 3000 PSI Inboard Leakage Rate: less than 2 χ 10-'° CC/sec. Materials: 316 st. steel or monel or brass. Kel-F seals Connections: Ά NPTF.
M V 5 series micrometering valve for precise control of flows from "ICC/min to 5L/min. Maximum Pressure: 150 PSI. Materials: 316 st. steel or brass. Connections: V4 NPTM or Ms O.D. Tube.
VERIFLO C O R P O R A T I O N
series shut-off valve. Diaphragm seal type air actuated. Normally open or normally closed. f Process pressure up to 80 PSI. Control pressure up to 100 PSI. Leakage Rate: less than 2 χ 10- 9 CC/sec. Materials: 316 st. steel. Kel-F seals. Connections: Vt O.D. Tube or V* VCR Tube.
DV25
VC10 series check valve for positive sealing at very low reverse differential pressure. Zero leakage at pressure up to 3000 PSI. Cracking differen tial pressure: 0.4 PSI Materials: 316 st steel or brass. Connections: Va NPT or % NPT or '/< O.D. Tube
250 Canal Blvd. ·
Richmond, CA 94804 ·
series shut-off valve diaphragm seal type
lever actuated: 90° rotation. Maximum Pressure: 3000 PSI. Leakage Rate: less than 2 χ 10- 9 CC/sec.
Materials: 316 st. steel or monel or brass. Kel-F seals. Connections: Vt NPTF or VA O.D. Tube.
(415) 235-9590 · TELEX 337 734
CIRCLE 221 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 52, NO. 3, MARCH 1980 . 443 A
