AN INNOVATION that makes the work of laboratorians lighter and more accurate is Ainsworth’s new PRINTING Right-A-Weigh Balance. Called the Model SP-BU, it’s a one-pan, constant sensitivity, semi-automatic balance that prints the weight on a tape.
The Model SP-BU consists of a modified Right-A-Weigh Balance, which will weigh loads from 200 g to 0.1 mg, connected electrically to a stabilized bridge circuit, and to an 8-place adding machine.
The cabinet holding the electronic system and computer is on casters; the balance and its load can be in a constant-temperature chamber or behind radiation barriers. Weights down to 100 mg are dialed manually, and “punched in” on the computer; below 100 mg, weighing is automatic.
Making loss-in-weight measurements? You weigh sample and container, let the computer print the weight as a negative sub-total… then simply punch the “WEIGH” button after the usual time. The loss in weight will be printed. (You use the same feature with tares and zero or buoyancy corrections, which
can be added or subtracted.)
Identification? Punch the date, test number, sample number, or other information on the tape before you weigh. If you dial the weight incorrectly, the machine won’t print it: a light on the balance signals “ADD WEIGHT” or “REMOVE WEIGHT.” It won’t print, either, unless the beam is at rest.
The Ainsworth PRINTING Right-A-Weigh Balance, Model SP-BU, for use on 115-volt, 60-cycle a-c, is $4850, complete with modified balance, cabinet with automatic weighing and recording circuits, and computer. Fisher’s own technical service experts have been specially trained to install, adjust and service it.
A semi-micro recording balance
Ainsworth also announces a new SEMI-MICRO Recording Balance, Model BYR-AU-1, for loads from 100 g to 0.01 mg (below 390 mg they’re weighed automatically). This is a counterpart of the 200-g capacity recording balance described in THE LABORATORY, vol. 26, no. 5, page 145.