QTY. 1. HERZOG HVU 481 AUTOMATED UBBELOHDE VISCOMETER TYPE: HVU 481, S/N: 064810363, 230 VOLT, 60 HZ, 1200 WATTS. INCLUDES 2 VISCOSITY TUBES, 1) = 0,005137 NIR 3780, 2) = 0,0050176, NIR 3780. AND OPERATORS MANUAL .PDF CONFORMS TO: ASTM D445, ASTM D446, DIN 51562, IP 71, ISO 3104, ISO 3105, GOST 33. THE HERZOG HVU 481IS FITTED WITH A VISCOSITY BATH TO RECEIVE 2 HVU 481 UBBELOHDE VISCOMETERS YIELDING A MEASUREMENT RANGE OF BETWEEN +20 °C AND +150 °C, WITH AN AUTOMATIC WASHING AND DRYING DEVICE, ELECTRONIC TIME MEASUREMENT UNIT AND A PROGRAM THAT MEETS THE REQUIREMENTS OF OUR WORLD-WIDE CLIENTS (MANUFACTURE AND SUPPLY OF VISCOMETERS SINCE 1977). A SPECIAL SILICON OIL IS REQUIRED AS THE BATH LIQUID. THE UNIT WAS DESIGNED SUCH THAT IT INCLUDES FEATURES TO PROTECT THE ENVIRONMENT (SMALL SOLVENT QUANTITY FOR CLEANING PURPOSES). THE HERZOG HVU 481 VISCOMETERS CAN BE USED AS INDIVIDUAL UNITS. THE VISCOSITY DETERMINATION FOR MINERAL OILS, HYDROCARBONS AND OTHER TRANSPARENT OR NONTRANSPARENT LIQUIDS THAT BEHAVE LIKE NEWTON'S FLUID REPRESENTS A TESTING METHOD OFTEN REQUIRED BY THE MINERAL OIL INDUSTRY. THE PRODUCT SPECIFICATIONS DEFINE THE RESPECTIVE ALLOWABLE VISCOSITY RANGE. WITHIN THE ALLOWABLE LIMIT RANGES, IT IS THUS PARTICULARLY IMPORTANT TO ACHIEVE ACCURATE MEASUREMENTS WITH AN EXTREMELY HIGH REPRODUCIBILITY. THIS REQUIRES THE USE OF A HIGHLY ACCURATE VISCOMETER, A VISCOSITY BATH WITH AN EXTREMELY HIGH TEMPERATURE STABILITY AND AN ACCURATE TIME MEASUREMENT. A NUMBER OF GLASS VISCOMETERS ARE AVAILABLE TO DETERMINE THE KINEMATIC VISCOSITY. THE UBBELOHDE VISCOMETER WITH A SUSPENDED SPHERE LEVEL HAS PROVEN TO BE A DEVICE PRODUCING THE MOST ACCURATE MEASUREMENTS. DUE TO THE DESIGN FEATURES OF THE UNIT, THE COEFFICIENT OF EXPANSION EXHIBITED BY THE GLASS AT DIFFERENT TEMPERATURES HAS SUCH A MINOR EFFECT THAT IT CAN BE NEGLECTED. THE HERZOG HVU 481 IS BASED ON THIS UBBELOHDE VISCOMETER AND USES A FOURTH GLASS TUBE TO OBTAIN AN AUTOMATIC CLEANING PHASE; IT IS AVAILABLE IN TWO VERSIONS. WITH NIR - CAN BE USED FOR TRANSPARENT TO VERY DARK SAMPLES (ORDER NO. 04805-000-XX). WHEN THE MENISCUS IS NO LONGER OPERATIVE DUE TO THE LOW TRANSPARENCY EXHIBITED BY THE SAMPLE, THE HVU 481 PROGRAM SWITCHES AUTOMATICALLY TO THE THROUGH-VIEW MODE. WITH NTC - USED FOR NON-TRANSPARENT SAMPLES OR FOR SAMPLES THAT ABSORB NIR (NEAR INFRARED) OR REFLECT THROUGH SOLID BODIES (ORDER NO. 04806-000-XX). NIR AND NTC VISCOMETERS CAN BE USED SIMULTANEOUSLY IN A HVU 481 BATH.