Accurate at 80:1
Foxboro S series pressure transmitters are accurate at turndowns on the order of 80:1. For more information, see www.fielddevices.foxboro.com.
Foxboro by Schneider Electric has introduced a new series of pressure transmitters that store 11 calibration points in firmware. As the pressure input changes, the transmitter automatically selects the proper calibration curve for that specific input. "We call this patented technology FoxCal," says Patrick Cupo, product manager, pressure and temperature, Foxboro. "The result is a very accurate output that covers three to four ranges of competitive instruments."
S series models cover pressure ranges to 1,000 in.WC (2.5 bar), to 2,000 psi (138 bar), and to 6,000 psi (414 bar). Each is calibrated at 2.5, 5, 10, 20, 30, 40, 50, 60, 70, 85 and 100% of upper range limit (URL). "The FoxCal calibration points are stored in the transmitter firmware forever and cannot be deleted accidentally," says Cupo.
Using this multiple calibration approach, the reference accuracy of the transmitter is maintained even at high turndowns. The accompanying figure shows the effect of FoxCal technology on transmitter accuracy. Common pressure transmitter reference accuracy typically begins degrading at turndowns greater than 10:1. "The S series allows turndowns on the order of 80:1 without sacrificing accuracy," Cupo says. "The customer is no longer forced to use algebraic equations to determine the accuracy at high turndown. The S series offers a simple percent of reading specification."