FoamGage cuts cost of foam measurement

12/01/1999


Systematic Controls Corp. figured out a low-cost, reliable way to measure foam or entrapped air bubbles in a liquid within a tank or vessel. The FoamGage, at $2,900, does a better job than its nearest competitor priced at $55,000, says the manufacturer. The system, with patent pending, combines two level-measurement instruments into one NEMA 4X system, including 18 x 14 x 8-in. display and controller for applying the correct amount of defoamer. While custom configurations can incorporate an existing level measurement device, the standard unit includes a bubble tube pressure transmitter to detect level and a RF probe that measures the foam or trapped air's capacitance compared to the liquid, providing the combined level. Both readings are displayed on the panel; a controller displays the true foam reading as a percent of liquid volume. Programming for on/off, 4-20 mA, or PID control of a defoamer valve or a pump is possible. Military-grade sensor provides 0.1% of full-scale deflection (span). Several potential users say the unit will pay for itself in times ranging from days to hours, depending on amount of defoamer used, according to the manufacturer.

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