22 A A N A L Y T I C A L C H E M I S T R

Α. Η. Τ. CO. SPECIFICATION

CONSTANT TEMPERATURE BATH With operating sensitivity well within ± 0.005° C

9926-D.

CONSTANT TEMPERATURE BATH, Infrared, Research Model, A.H.T. Co. Specification. Utilizes lagless, radiant heat from a reflector-type, infrared bulb with red bowl, operating intermittently through relays and a mercury-in-glass thermoregulator, and provides operating sensitivity beyond that heretofore available with metallic heating units in this type of outfit. The bath offers full visibility and ample un­obstructed working space for experimental work.

Temperature range, using only the infrared bulb, is to 45° C, and can be extended to 55° C at normal room tem­peratures by means of 100-watt auxiliary heater of im­mersion type. Operating sensitivity in this range is well within ±0.005° C; under carefully controlled condi­tions, in laboratory tests at about 37° C extending over several days, temperature control was maintained to ±0.001 ° C, as determined by a Beckmann thermometer.

The infrared bulb, 250 watt capacity, is mounted in a Stainless steel housing with heat resistant plastic switch panel, with relays and individual switches for power, stir­ring motor and auxiliary heater. In use, the lamp is placed on the table beside the bath, adjacent to the stirrer and thermoregulator. A metal baffle in the bath confines the focused rays from the lamp for optimum efficiency. Stirring is by means of a 1600 r.p.m. motor, power con­sumption 28 watts, and a four-bladed Monel metal paddle, 2 inches diameter, mounted on the nonmetallic top plate which fits on the rim of the bath without clamping. Maxi­mum power consumption 385 watts.

The complete outfit includes a Pyrex brand glass jar, 12 inches high χ 12 inches diameter.

The thermoregulator is a sensitive mercury-in-glass type, the setting of which is comparable to that of a Beck­mann thermometer. The thermometer included is for indicating the operating temperature; for precise tempera­ture adjustment the use of a Beckmann thermometer in the working space is suggested but it is not supplied with the bath.

The temperature range can be extended by the use of immersion heaters of higher wattage in place of that regu­larly supplied, or can be lowered below that of ambient air by addition of 9927-C Cooling Tube and external coolant, such as tap water, but the operating sensitivity is reduced somewhat at higher temperatures. The cooling tube fits into the top plate in place of the heater but is not regu­larly supplied with the bath.

9926-D. Constant Temperature Bath, Infrared, Research Model, as above described, complete with Thermometer 0 to 50° C in 0.1°, 100-watt immersion heater, 6 ft. cord and plug, and directions for use. For 115 volts, 60 cycles, a.c 206.50

9927-C. Cooling Tube, only, for use in 9926-D, complete with setscrew for attachment to top plate 7.70

ARTHUR H. THOMAS COMPANY LABORATORY APPARATUS AND REAGENTS

WEST WASHINGTON SQUARE PHILADELPHIA 5, PA.

Te le type Services: W e s t e r n U n i o n WUX a n d Bell S y s t e m PH-72