Proline Promass 83E/F/O Modbus RS485 Operating Instructions

CommissioningProline Promass 83 Modbus RS4856.4 Device configuration6.4.1 Concentration measurementThe measuring device determines three primary variables simultaneously:• Mass flow• Fluid density• Fluid temperatureAs standard, these measured variables allow other process variables to be calculated, such as volumeflow, reference density (density at reference temperature) and corrected volume flow.The optional software package "Concentration measurement" (F-Chip, accessories) offers amultitude of additional density functions. Additional evaluation methods are available in this way,especially for special density calculations in all types of applications: ä 87• Calculating percentage contents, mass and volume flow in two-phase media (carrier fluid andtarget fluid),• Converting density of the fluid into special density units (°Brix, °Baumé, °API, etc.).Concentration measurement with fixed calculation functionBy means of the DENSITY FUNCTION (7000) function, you can select various density functionswhich use a fixed specified calculation mode for calculating concentration:Density function%–MASS%–VOLUMERemarksBy using the functions for two-phase-media, it is possible to calculate the percentage mass orvolume contents of the carrier fluid or the target fluid. The basic equations (without temperaturecompensation) are:D2·( – D1)Mass [%] =·100% ·(D2 – D1)a0004610-enVolume [%] =( – D1)(D2 – D1) ·100%a0004619-enD1 = density of carrier fluid (transporting liquid, e.g. water)D2 = density of target fluid (material transported, e.g. lime powder or a second liquefied materialto be measured) = measured overall density°BRIX°BAUME°BALLING°PLATO%-BLACK LIQUOR°APIDensity unit used for the Food & Beverage industry which deals with the saccharose content ofaqueous solutions, e.g. for measuring solutions containing sugar such as fruit juice, etc.The following ICUMSA table for Brix units is the basis for calculations within the device.This density unit or scale is mainly used for acidic solutions, e.g. ferric chloride solutions.Two Baumé scales are used in practice:– BAUME > 1 kg/l : for solutions heavier than water– BAUME < 1 kg/l : for solutions lighter than waterBoth units are a commonly used basis for calculating the fluid density in the brewery industry. Aliquid with a value of 1° BALLING (Plato) has the same density as a water/cane sugar solutionconsisting of 1 kg cane sugar dissolved in 99 kg of water. 1° Balling (Plato) is thus 1% of the liquidweight.The units of concentration used in the paper industry for black liquor in % by mass. The formulaused for the calculation is the same as for %-MASS.°API (= American Petroleum Institute)Density units specifically used in North America for liquefied oil products.Page 74 • MN0M030Issue/Rev. 0.2 (12/12)