Glossary Mho/cm see S/cm. Millesimal pH Buffer This line of buffers with millesimal accuracy (±0.002 pH), has been prepared to meet the increasing need for assured accuracy in pH measurements. Each bottle is provided with a certificate of analysis, prepared by comparison with NIST standards. MR Medium Range. MTC Manual Temperature Compensation. The temperature value, shown on the LCD, can be manually set. The compensation is referenced at the selected temperature. mV 1/1000 of a volt, a measure of electrical potential (voltage). NIST National Institute of Standards and Technology. nm Nanometer. Unit of measurement for length in the metric system, equal to one billionth of a meter. NoTC No Temperature Compensation. For actual conductivity or TDS measurement, the temperature value shown on the LCD is not taken into account. NPK Nitrogen, phosphorus, and potassium. NPT National Pipe Thread. A U.S. standard for tapered threads used on threaded pipes and fittings. NTU Nephelometric Turbidity Unit. °Oechsle (°Oe) °Oechsle is mainly used in the German, Swiss and Luxenburgish winemaking industry to measure the sugar content of must. The °Oe scale, one degree Oechsle corresponds to one ram of difference between the mass of one liter of must at 20°C and 1 kg (the mass of 1 liter of water at same temperature). Open Junction This type junction, found in reference half-cells, is filled with a special gel which comes into direct contact with the solution to be measured. An advantage of an open junction is low contact resistance and it is virtually impossible to clog. Opto-isolator In electronics, an opto-isolator is an electronic device designed to transfer electrical signals by utilizing light waves to provide coupling with electrical isolation between its input and output. ORP Oxidation Reduction Potential. Solutions can be graded as oxidizing or reducing based on measurement of ORP values. OSHA The Occupational Safety and Health Administration. OUR Oxygen Uptake Rate. Used to determine the oxygen consumption or respiration rate; is measured in mg of oxygen consumed per liter per hour. PAN 1-(2-pyridylazo)-2-naphtol (indicator) PCU Platinum Cobalt Unit. PD Controller Proportional Derivative controller. PEI Polyetherimide. PELs Standards for the length and intensity of exposure to certain elements. Pfund Scale The Pfund scale is a color grader used to provide readings of the range of honey colors. There are seven color classifications for processed honey; water white, extra white, white, extra light amber, light amber, amber and dark amber. Traditionally, the Pfund color grader works by visually comparing a wedge-shaped glass container of honey with an amber glass wedge. pH [NIST] The negative logarithm of the hydrogen ion activity has been given the symbol pH. The original definition was in terms of hydrogen ion concentration. The present definition of pH is associated with the “effective” concentration of hydrogen ion. 16 Glossary 16.12 | www.hannainst.com
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