NEW PRODUCTS FOR ANALYSTS . . . . . Equipment, Robomatic Refractometer
Apparatus,Instruments,Reagents,Material ... 7
In conjunction with the Dow Chemical Co., the Precision Scientific Co. has announced the development of a control instrument called the "Robomatic refractometer." It controls the flow of process streams by refractive index and instantaneously, continuously records the results. Application is found where the liquids produced or combined are clear enough to provide a refractive index. The apparatus covers the range of indexes from 1.32529 to 1.54409. According to the manufacturer it will control over the entire range to within three parts in the fifth decimal place. In operation, the process liquid is pumped into a constant temperature bath surrounding the refractometer prism. A sodium light behind the bath sends light through the liquid to the eyepiece and also to a. photoelectric cell. The response of the photoelectric cell actuates a recording pen. Movements of the pen effect pressure changes in an air controller which in turn operates diaphragm valves in the process pipes. The instrument comprises a dipping refractometer·, a constant temperature bath with a range from 30° to 150° F., accurate within 0.02 °, a recorder actuated by a photoelectric coll and amplifier, and an air-operated controller. Polarimeter
... 2
A Swiss-made full-circle polarimeter has been introduced to the American market by the Kern Company. According to this company this unit has its field of vision divided into three parts instead of two, the middle position forming the surface of contrast—an arrangement claimed to make for easy adjustment. The instrument is provided with a full-circle scale, which is of sufficient diameter for measuring rotations up to ±180°. The graduated circle is divided into half degrees and, in combination with the vernier, permits readings of 0.05° and estimations of 0.01 °. Tubes of 100 and 200 mm. are provided for general use and one of 95.04 mm. for the determination of glucose. A u t o m a t i c Pipets
... 3
Liquids used routinely in small quantities can be dispensed safely, accurately, and conveniently by means of either of two new pipets, according to Fisher Scientific Co. The rrew automatic pipet will dispense any volume up to 2.0 ml. merely by operating a plunger. Once the volume selector has been set an adept operator can operate the pipet 20 to 30 times per minute. I t has four slots and a vernier control whereby the stroke of the plunger is set to deliver an exact volume. The plunger is operated by means of a rubber bulb, and its stroke (therefore the volume) is uniform each time it operates. The second new dispenser is a Micropette for volumes
up to 0.7 ml. It has a unique sliding sleeve and sctscrcw arrangement by means of which any preset volume can be expelled. There is always an additional amount of fluid in the pipet, and only the desired amount is dispensed so that drainage errors are eliminated. With the Micropette and distilled water it has been found that the accuracy of liquid dispensed is within ±0.001 %. Beta, Gamma M o n i t o r
... 4
A new beta, gamma portable count-rate meter, kown as Model 2610A, has just been offered by Nuclear Instrument and Chemical Corporation. Incorporating an electrica,! circuit which has been manufactured by the company for several years, the new model is housed in a water-tight case designed especially to improve ease in operation by the user. The interior is tropicalized to eliminate effects of humidity or other adverse atmospheric conditions. The probe is also watertight and contains a plugin type Geiger tube to facilitate servicing. Convenience in use is claimed by reason of the location of the probe in the handle of the instrument and the fact that the range switch can be manipulated by the same hand that is carrjdng the instrument. Manipulation of the probe, as well as movement of the sliding beta shield, is also easily accomplished with one hand. Circuit components are mounted in the cover· for· ea,sy accessibility. The meter is calibrated in both milliroentgens per hour and in counts per minute. The instrument is supplied complete with an attached radioactive source for checking calibration, batteries, and cr.ystal earphones. Ultraviolet Chromatographic A n a l y z e r ... 5 An instrument called U-VE-Chrom for all applications of ultraviolet radiation in conjunction with chromatographic techniques has been announced by the Phillips Scientific Specialties Co. The instrument utilizes a combination of ultraviolet stimulated fluorescence and selective adsorption on silica gel, as in the new method now being used in the petroleum industry to determine aromatics in hydrocarbon solutions. Components include: power· supply, light sources, controls, supporting rods and adsorption tubes. These are mounted on a chassis 12 by 17.5 inches, 34 inches high. Water Purity Indicator ... 6 The F. J. Stokes Co. has announced a new indicator for quick and accurate testing of distilled and de-ionized water. It operates on the principle that the conductivity of water is directly proportional to its ion content. Calibrated to zero for pure water and directly in terms of impurity content within the range of 0 to 30 parts per million of sodium chloride this tester can be plugged into a 110-volt, 60cycle source. Special models can be supplied for other current sources.
(For furtKer information on t h e s e i t e m s use c o u p o n on p a g e 35 A) 31 A
VOLUME
33 A
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New Products,
Continued
Balance Scoop and Counterweight
. . .7 The Ohaus Scale Corp. has an nounced the availa bility of a new ana lytical balance scoop and counter weight, both of which are made of aluminum to elimi nate buoyancy errors due to air density variations. According to the manufacturer these scoop and counterweight sets are precisely balanced for use in the finest analytical work. Because both the scoop and the counterweight are made of aluminum, the balance remains constant, unaffected by air density changes which the company says can introduce large buoyancy errors when t h e scoop and counterweight are made of dissimilar metals. The 10-ml. scoop measures 7/i« m ( ' h deep, and 2 inches in over-all length, and weighs about 4.5 grams. The 30-ml. scoop is 0.75 inch deep, 3 inches in over-all length, and weighs about 13 grams. Each set is serialized with corresponding numbers for easy identification where more than one set is being used. Beta-Gamma Survey Meter . . . 8 Improved mechanical construction and electrical character istics are claimed by Victoreen Instrument Co. for its new Model 263B beta-gamma, survey meter. On the mechanical side the improvements are more rugged construction, decreased height, and decreased weight. Electrically the use of a 1B85 thyrode and two 5828 medium μ triodes improves accuracy and reliability. Full scale sensitivity on three ranges is 130, 1300, and 13,000 counts per second. A microammeter calibrated with gamma rays from radium in milliroentgens per hour, measures t h e average intensity of beta a n d / o r gamma radiation. G e i g e r - M ü l l e r Scaler . . .9 An automatic scaler for nuclear measurements has been added to its line by the Berkeley Scientific Co. Known as model 2000 this instrument is designed so that the number of counts is read directly in number on the front panel. A decimal scale of 1000 is used in combination with a new direct reading mechanical register with zero reset. High voltage power supply is electronically regulated t o 0.005% and is of the R F type. A direct reading electric time clock is built in. Automatic operation for predetermined number of counts, up t o 20,000, may be reset conveniently by selector knobs on the front panel. An accessory timer is available for automatic operation for predetermined time intervals. Water Alkalinity Test Paper . . . 1 0 A new test set from the Development Laboratory of the La Motte Chemical Products Co. employs a series of test papers for differentiating between caustic alkalinity, carbonate alkalinity, and bicarbonate alkalinity of water and solutions. The compact kit is available consisting of three vials of selected indicator papers which will quickly show the nature of the alkalinity. Pressure Control . . . 1 1 The Emil Greiner Co. has introduced a new Cartesian manostat for automatic pressure and vacuum control. Based on the principle of the Cartesian diver, this new manostat is claimed by the company to eliminate the need for complicated electrical and mechanical systems. The instrument is available in all stainless steel or stainless steel with plastic body tube.
Klett.... Photometers Kleit-SedstuneSiAaw. Photoelectric QÙUo. Cell GoltvUtHiet&i me. BQO-3
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No. 2070
Designed for t h e rapid and accurate d e t e r m i n a t i o n of t h i a m i n , riboflavin, and other s u b s t a n c e s w h i c h fluoresce i n s o l u t i o n . The sensitivity a n d s t a bility are s u c h t h a t i t h a s been found particularly useful i n d e t e r m i n i n g very s m a l l a m o u n t s of these substances.
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