Statistical Test Data: ChemSpec 150 ChemSpec™ 150 1. Repeatability Study MUN [mg/dl] Sd Cu(%) For more information on ChemSpec, please contact Bentley Instruments or your closest representative. Mean, Standard Deviation and Coefficient of Variation for the MUN determination in 30 samples based on five consecutive determinations. BENTLEY INSTRUMENTS Analytical Instruments For The Dairy Industry The ChemSpec 150 utilizes a modified Berthelot reaction to determine the level of Urea in milk. ♦ A small amount of milk is automatically dispensed in a well thermostatted at 40°C. It is then split enzymatically with urease into ammonia and carbon dioxide. ♦ After an incubation time, dye and activator solutions are added to form a green complex. The color intensity is proportional to the ammonia concentration. ♦ The green color intensity is measured spectrophotometrically in a trans-reflectance cell. ♦ The addition of a catalyst in the dye speeds up the reaction, intensifying the green color development, thus enhancing the sensitivity of the method. ♦ The use of a highly precise sample dispenser allows the ChemSpec 150 to bypass a pre-dilution step. The milk is simply diluted in the chemicals used to generate the reactions. This dilution reduces the opacity of the medium, thus improving the spectrophotometric measurement and preventing interference from other milk components. ♦ By alternating measurements of natural ammonia and converted ammonia, the ChemSpec implements a 2-channel FIA. The difference signal from the two measurements allows the ChemSpec to precisely determine the Urea concentration. ♦ A carrousel incubator allows analysis overlap, yielding a capacity of 150 samples per hour.

ChemSpec 150 • Accurate • Compact • Fast • Reliable Innovative Design Touch Screen T he ChemSpec 150 touch screen is simple, reliable and accurate. Anyone can operate the instrument after a short orientation. The touch screenis resistant to normal wear and usage, and will not be damaged by wet hands. T ouch screen makes program selection and status checks instantaneous. T he 17-well carrousel allows analysis overlap, resulting in a capacity of 150 samples per hour. A highly precise sample dispenser allows the ChemSpec 150 to bypass a pre-dilution step (milk is diluted in the chemicals used to...