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FLEXO Magazine : June 2013
SENSOR OUTPUT TO VISCOSITY-CUPS Printers have decades of knowledge based on the use of viscosity cups and often the optimal ink viscosities are known in units of cup-seconds for a particular type of viscosity cup. To simplify ink correlation procedures, Vectron has estab- lished calibration techniques that the end user can use to translate the sensor ’s output into any unit of measurement they require. Whether it’s a Din 4, EZ Zahn #2 or any other viscosity cup, simple calibration techniques allow the printer to translate sensor measurements directly into units of cup- seconds for their viscosity cup of choice. The top of Figure 4 shows the raw sensor AV measure- ment translated into units of cup-seconds for an EZ Zahn #2 viscosity cup. The bottom graph in Figure 4 demonstrates the minimal error in the translated value of cup-seconds viscosity. WRAP-UP The use of Vectron’s ViSmart Solid State Viscosity Sen- sors, Shunt-Diode Barriers, and VisConnect DIN Rail Mount Converters enable real-time measurement of ink viscosity. Due to the sensor’s small size, ink delivery systems can be configured in ways that were not previously possible. As a result, a more compact and more versatile ink management delivery system can be designed by either system integrators or directly by the printing press OEMs themselves with excel- lent system performance. Vectron’s ViSmart viscosity sensors reflect technologies dis- cussed in this piece. They are offered in two series: VS-2000 and VS-2500, depending on the application requirements. For OEM printing applications, the VS-2500 series is the recom- mended solution and has an M12 x 1 circular connector. The VS-2500 is Φ1.00 x L 4.23-in. (Φ25.40 x L 107.42 mm) and is substantially smaller than the falling piston, falling ball and vibrating rod viscometer solutions. The viscosity range is 1 to 400 AV (~1 .7 to 510 cSt) for Cannon S60 calibration fluid with a density of 0.886 g/cm3. For more information, please visit www.sengenuity.com. n About the Author: Based in Hudson, NH, Justan Steichen has worked for Vectron International for 5 years and is the product marketing manager and applications engineer for fluid sen- sors. He has well over a decade of electrical cicruit design, system design, and product test experience across a varitey of industries including cellular communications, aerospace, and industrial electronics. He holds a BSEE from Univeristy of Colorado, Colorado Springs. Figure 4: Calibrated sensor measurement vs. temperature for varied (10 percent to 20 percent) concentration of ethanol mixed into Flint CF white ink translated into EZ Zahn #2 cup-seconds and the associated error. www.flexography.org JunE 2013 FLEXO 95