1/2/2023 0 Comments Viscosity cup![]() ![]() In general, liquids with higher viscosities will require a larger turbine as well as larger size needles, nozzles and air caps.Ĭheck out the conversion chart below for recommendations on atomizing set sizes based on viscosity measurements. Viscosity cups measure viscosity by using gravity. The thicker the coating, the longer it will take to flow through the hole, producing a higher reading. Measurements are provided in centistokes, and are expressed in seconds. Step 7: Thoroughly clean the cup with spray gun cleaner and dry it with a soft, lint-free cloth. Step 6: Repeat steps 3 – 5 until you have obtained a consistent reading. Step 5: Write down the number of seconds on the stopwatch. Step 4: Stop the timer when you see the first break in the liquid stream at the bottom of the cup. Step 3: Start the timer as soon as the top edge of the cup breaks the surface of the liquid. Step 2: With a finger in the ring, quickly lift the cup vertically out of the liquid. Stir it around for a few seconds to allow any air bubbles to dissipate. Ensure that the cup is clean and dry with no residue. The liquid temperature should be 77☏ or 25☌. You will need a stopwatch in order to get an accurate measurement. The #2 is best for measuring thin liquids including spray coatings. The difference is size is based on the varying size of the holes in the bottom of the cup. Zahn cups are available in five models numbered #1 - #5. BS Viscosity Flow CupsThe Elcometer 2354 BS Viscosity Flow Cups are very easy to use instruments made of anodized aluminium with a stainless steel orifice, for measuring the consistency of paints, varnishes and similar products.The measured kinematic viscosity is generally expressed in seconds (s) flow time. There is a long handle with a ring at the top that is attached to the side of the cup. The Zahn cup is a stainless steel cup with a very small hole in the bottom. The easiest and most affordable way to measure viscosity is with a Zahn Viscosimeter. This measurement determines which size turbine and atomizing set (needle, nozzle and air cap) to use with your HVLP paint spray gun. Viscosity refers to the thickness or internal friction of a coating. These instructions pertain to the Zahn viscosity cup. Viscosity cup how to#The first moment the flow breaks (is not consistent) stop the watch.This article will walk you through how to measure paint viscosity for spraying with an HVLP spray gun. Pull up and as soon as the cup breaks the surface start the stop watch. Next put your stop watch in one hand and grab the viscosity cup with your other hand. Get a reading of the temperature from the liquid and record it. The larger the cup the longer it should sit. Let the cup sit for an additional 1-5 minutes depending on the mass. Next stir the liquid in order to ensure uniform temperature and density. Twist several times in order to dislodge any air bubbles from within the cup. Submerge the dip cup completely in the liquid being measured. Using abrasive cleaning materials such as a wire brush could damage the cup again causing issues in accuracy. Dirty equipment will impact the accuracy of the test. The Zahn viscosimeter is a bullet-shaped, corrosion-resistant, stainless steel cup with a precision drilled orifice. Using a suitable solvent clean the cup, handle and orifice to verify there is no residue. Quickly check the viscosity of paint, varnish, lacquer, inks, syrups, or other liquids. Validate there are no pre-set standards since certain viscosity tests have unique flow time standards. ![]() If not listed, select a cup that will give an estimated flow time of 30 - 100 seconds. Blast Hose, Nozzle Holders and Couplingsġx Stop Watch Determine The Proper Dip Cupįirst check the products technical data sheet to see if a dip cup has been listed. ![]()
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