These flowmeters use Correlation Transit-Time mode for a high signal-to-noise ratio and accurate, drift-free flow measurements in fluids ranging from completely clean liquids containing no "scatterers," where Doppler-type meters cannot work, to moderately dirty liquids with enough entrained solids, second-phase liquid droplets or gas bubbles to cause conventional transit-time meters to fail. When conditions become too attenuating, the meter's Digital Signal Processing (DSP) circuits are switched to TransFlection mode to measure multiphase streams that cannot be measured by any other technique.
Switching between Correlation Transit-Time and TransFlection modes is easily accomplished via the meter's keypad. Both modes employ all the same equipment. Using clamp-on transducers, the meters measure flow rate through metal, plastic or even concrete-lined pipes without penetrating the pipe wall, in pipes from ½ in. to over 207 in. diameter. Measurement in either mode is non-contaminating and obstruction-less, causing no pressure drop.
For more information contact Panametrics, Inc., 221 Crescent St. Waltham, MA 02154~497; Tel. 617/899-2719; Fax. 617/894-8582.