Glossary each SMART electrode is calibrated, these electrodes can be used in succession without requiring new calibration. Hanna’s intelligent electrodes help eliminate errors and will save time when working with more than one electrode. SOP Standard Operating Procedures means documented procedures which describe how to perform tests or activities normally not specified in detail in study plans or tests guidelines. SOUR Specific Oxygen Uptake Rate. This is used to determine the oxygen consumption or respiration rate; SOUR is measured in mg of oxygen consumed per gram of volatile suspended solids per hour. SPDT relay Single Pole Double Throw relay. Specificity Specificity is the ability to assess unequivocally the analyte in the presence of components which may be expected to be present. Typically these might include impurities, degradants, matrix, etc. Speedsafe™ Each Hanna stirrer is equipped with a speed sensing device (optosensor) coupled with an FVC (frequency voltage converter), which monitors the speed. As the speed reaches a preset maximum level, the speed limiter shuts down the VCO to slow down the motor speed. This ensures that when the load is suddenly removed from the stirrer, the motor will not accelerate to such a high speed that will be hazardous to both the user and the stirrer; a feature not commonly found in conventional stirrers. SPST Relay Single Pole Single Throw relay. SRM Standard Reference Material (CRM of National Institute of Standards and Technology). Storage Solution Solution used to keep the electrode moist when not in use. TDS Total Dissolved Solids (often abbreviated TDS) is a measure of the combined content of all inorganic and organic substances contained in a liquid in: molecular, ionized or micro-granular (colloidal sol) suspended form. TDS Factor When a solution does not have a similar ionic content to natural water or salt water, then a TDS conversion factor is needed to automatically adjust the readings. TDS = CF x conductivity (CF is TDS Conversion factor). TFPC Thin Film Polymer Capacitance. TEA Total Exchangeable Acidity - A measure of the amount of acidic cations (hydrogen, aluminum, iron and manganese) present in soil. It is expressed in Milliequivalents per 100 grams (meq/100 g) of soil. °Th Degree Thörner is determined by titrating a 10 mL sample diluted with twice its volume of deionized or distilled water with 0.1 M sodium hydroxide to a phenolphthalein end point. Timer Function Counts down to appropriate time interval before a reading is displayed. This feature ensures consistency in measurements. TPTZ 2,4,6-tri-(2-pyridyl)-1,3,5-triazine (iron indicator) Traceability [IUPAC] Property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties. The concept is often expressed by the adjective traceable. The unbroken chain of comparisons is called a traceability chain. Turbidity Turbidity of water is an optical property that causes light to be scattered and absorbed, rather than transmitted. The scattering of the light that passes through a liquid is primarily caused by the suspended solids. The higher the turbidity, the greater the amount of scattered light. Because even the molecules in a very pure fluid scatter light to a certain degree, no solution will have zero turbidity. UPW Ultra Pure Water. USB Universal Serial Bus is a application to establish communication between various devices and a host controller (usually a PC). USDA United States Department of Agriculture. 16 Glossary 16.15 www.hannainst.com |
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