NEW PRODUCTS FOR ANALYSTS Equipment, Apparatus, Instruments, Reagents, Materials Humidity Indicator
The pumping action can be so closely controlled that even fresh blood can be passed through the pump without the destruction of blood cells or coagulation. Pump body blocks may bo obtained in Bakélite or Bakélite with graphite filler. Flex-i-Iiners made of natural rubber, pure gum rubber, Hycar, Perbunan, or neoprene are available. At present, Ρ series pumps are obtainable in capacities up to 5 gallons per minute. Terminals are either drilled and tapped with 0.50- or 0.75-inch standard pipe thread, or supplied with standard saran tubing fittings or hose con nections. The pump requires a 0.25-hp. motor and can be furnished either alone or completely mounted and connected to a constant- or variable-speed drive. 2
The new humidity indicator offered by Andrew Technical Service consists of a card measuring 6.75 X 1.88 inches. Its vertical column contains seven color spots which denote relative humidities from 10 to 70%. Usable at temperatures from 50° to 200° F., the Humigraph is said to be superior in accuracy. to inexpensive hygrometers at low and normal humidities. For small changes in humidity, the card re sponds in about 10 minutes. For a change of 40%, the response time is about 30 minutes. Changes in humidity cause the spots to turn color. The reading is made at the top blue spot. The indicator may be used as an insert for long-term packaging of materials affected by humidity changes or in checking humidity without recourse to instru ments or charts. 1
Laboratory Ozonator
A new laboratory ozonator, Model T-23, has been intro duced by the Welsbach Corp. The instrument is intended for use in testing the poten tial value of ozone as an oxidizing agent in various chemical processes, in phenol and cyanide destruc tion in industrial wastes, and in the reduction of tastes, odors, and color in water purification. The company produces an entire line of ozonators which range in size from the new laboratory model to much larger units which make possible the low-cost production of tonnage ozone. 3
Polyethylene and Vinyl Pump
The Vanton Pump Corp. has reported the availability of its new Ρ series of noncorrosive and noncontaminating "flex-i-liner" pumps in which the fluid transferred comes in contact only with a polyethylene body block and a vinyl nex-i-liner. The pump is able to withstand the extreme corrosive action of acids such as sulfuric, hydrochloric, nitric, and hydrofluoric, as well as caustics and other chemicals to which polyethylene and vinyl are resistant. The design of this unit has eliminated such pumping trouble sources as stuffing boxes, packing glands, shaft seals, check valves, and gaskets. An eccentric rotor mounted on a sealed-in ball bearing rides inside and activates the molded vinyl flex-i-liner, creating a squeegee action between the outside of the liner and the inside of the polyethylene body block. Molded flanges on the liner seal off the fluid passageway from contact with any of the moving parts of the pump. As a result of this par ticular type of pumping action, high polymer slurries will not be eoagulated, nor will solids be removed from suspension.
Circle desired items for further information on items listed in this section Inquiry Card Is Valid Six Months from Publication Date
Photomultiplier Microphotometer
A new photomultiplier microphotometer for the precise measurement and comparison of light intensities from 20 micromicrolumens to 20 lumens at selected wave lengths has been devised by the American Instrument Co. I t is used in film densitometry, colorimetry, turbidimetry, fluorometry, light scattering, and other studies. The instrument provides readings of densities from 0 to 9 and phototube currents from 10 ~5 to 10 - 1 1 ampere. This range can be extended with neutral filters. Full-scale de-
T E C H N I C A L DATA DEPARTMENT JUNE
ANALYTICAL CHEMISTRY
1951
I am interested in the following circled items:
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ANALYTICAL
flections of the meter are given with photomultiplier (phototube) currents of 0.01, 0.1, 1, a n d 10 microamperes. Provision is m a d e for a n additional position on the range switch of 0.001 microampere full scale where this amplification is usable. T h e meter indicates per cent transmission, density, a n d photocurrent microamperes directly without correction factors. A n y filter 2 inches square m a y be positioned in t h e filter holder, either singly or in combinations u p to 0.625 inch thick. An outlet on the panel provides 10 m v . a t 100 microamperes for the operation of a commercial recorder. T h e instrument m a y be operated from a n y 100- to 140-volt, 60-cycle source. N o batteries are needed.
