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THE GSM "Sand Lab" is the ideal equipment to manage the irregular quality of return green sand. By measuring the on line characteristics of the prepared sand, such as compactibility, compression, green shear, temperature and moisture, it can adjust water & dry additions automatically in real time.

The GSM "Sand Lab" equipment is the result of constant research and development from the Space technical department, in order to supply a device which removes the need of continuous samplying and testing of green sand.

It measures the characteristics of any kind of sand and analyzes compactabilitiy, compression, green shear, temperature and moisture.

The measurements for each test are achieved by high accuracy detectors, administrated in real time by a programmable device. The equipment consists of three main components: return sand measuring unit, prepared sand sampling device and control cabinet. The return sand measuring unit PGF, analyzes the residual temperature and moisture by means of two sensors placed in the sand stream, while feeding the mixer batch hopper.

When measuring is completed, the Space customized software proceeds to average the single valued stored in the memory and estimates the quantity of water and additions necessary to achieve the programmed moisture and bond levels.

A specimen, taken from the freshly prepared molding sand, close to the mixer discharge point, is screened to remove all impurities that could affect the results before analysis. A feedback based on actual measurements is readjusting the water and additions made up for the next batch. This procedure assures continuity of the required physical characteristics within a very narrow range of variability. In fact, temperature and moisture are the most unstable features of return sand, and the accurate measurement, assured by our well known PGF instrument, makes the water dosing almost exact.

Available bentonite and fines, on the contrary, are adjusted smoothly, up or down, using archived batch trends. Feedback, consequent to analysis made on sand ready for moulding, is more reliable when compared to the one produced from a speciment sampled during the mixing operation. This is because of the more consistent homgeneity reached only at the end of a mixing cycle.

The GSM "Sand Lab" has also proven its reliability and operative accuracy on continuous as well as batch mixers.