SAND BATH for temperatures to 3 0 0 ° C

• Bath media is nonflammable and nonfuming

• Ideal for multiple neck flasks or those of irregular geometry

A m u l t i p u r p o s e h e a t e r des igned t o rep lace oil b a t h s a n d h e a t i n g m a n t l e s in t h e t e m p e r a t u r e r a n g e t o 300°C. E m p l o y s low pressure , low ve loc i ty compres sed a i r t o c o n v e r t s a n d or s imi lar r e f r ac to ry m a t e r i a l s t o a fluidized solid. T h e a e r a t e d s a n d a s s u m e s t h e p rope r t i e s of a nonvo la t i l e , n o n f l a m m a b l e , n o n w e t t i n g i n s u l a t e d l iqu id p e r m i t t i n g easy i m m e r s i o n a n d w i t h d r a w a l of flasks a n d o t h e r vessels . T e m p e r a t u r e r egu la t ion can b e ach ieved b y m e a n s of a n a u t o t r a n s f o r m e r or s imple p r o p o r t i o n a l con t ro l of i n p u t t o t h e h e a t e r coil. Bui l t - in cut-off swi t ch t u r n s off h e a t e r w h e n air p ressure t o b a t h is i n t e r r u p t e d .

Advantages: • Rapid heating and cooling • Bath media do not splash • Vessels are not wetted or coated by bath • Bath media remain clean and do not decompose

Principle—Air diffused through the porous bot tom of the bath produces a flotation effect upon the sand particles, reducing the relative density. The expanded bed behaves as a fluid; surface bubbles give the appearance of a boiling liquid. Heat is distributed through the bath by air passage and the displacement of sand particles. The fluidized bed exerts a buoyant effect upon immersed objects. Size—Inside dimensions 7l{ inches diameter X 5% inches deep to heater coil. Depth is sufficient to immerse 1000 ml round bottom flasks to the neck, or 2000 ml flasks to over half flask diameter. Overall dimensions, approximately 11 inches high X 9J4 inches diameter, exclusive of air valve and safety switch, which extend near base approximately 4 inches to the right and rear respectively. Air Supply—Requires a filtered air input, free of oil and dust, of approximately 3 p.s.i. pressure, a t a flow rate of 4 cu. ft. per minute. Compressor or impeller type sources are required. Diaphragm pumps do not ordinarily provide the required free air capacity. Bath Media—Clean, dry, free-flowing sand or material of similar density, screened to approximately 80 mesh, is required. Fines must be avoided. Approximately 10 lbs. required. Wattage—Heater is rated a t 750 wat ts at 115 volts, a.c. Construction—Interior is stainless steel, with full diameter ceramic porous plate a t bot tom. Tubular immersion heater is steel jacketed. Outer shell is enameled steel. Temperature Control—For controlling the temperature when operating the bath from 115-volt lines free of severe voltage fluctuation, an adjustable voltage transformer such as our 9708-G Type 116, 7.5-amp. Powerstat is suitable. A proportional wattage input controller can also be used; for optimum control, thermocouple-pyrometer controller is recommended.

8868 . Sand Bath, Fluidized, Tecam®, as above described. With built-in heater, air pressure cut-off switch, air control valve, 10 lbs. of sand, but without air pump or temperature control device; 115 volts, a . c ; 750 wat ts . . . . 160.00

ARTHUR H. THOMAS COMPANY Scientific Apparatus and Reagents

V I N E STREET AT 3 R D · P .O . BOX 7 7 9 · P H I L A D E L P H I A 5, PA., U . S . A . Circle No. 154 on Readers' Service Card

1 0 2 A · ANALYTICAL CHEMISTRY

Tecam®

FLUIDIZED

PRESSURE ACTUATED HEATER SWITCH

A I R — ^ PRESSURE

PERFORATED ^ E _ L r V ^ _ ,

HEATER ^ : .

:POROUS PLATE

STAINLESS -STEEL POT

: SANDγ

STEEL -OUTER SHELL

115 V-

AIR VALVE

Schematic cross-section of Fluidized Sand Bath

Thomas