ABB 2600T Series Operating Instruction

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ABB 2600T Series Operating Instruction Manual pdf 39 page image

- 39 -Sometimes, in case of tank level measurement, it becomes difficult to calculate the LRV or the URV of the transmitter, or to emptythe tank for zero adjustment. So, not only with flange-mounted, but also with differential pressure transmitters using remote seals,the Output % Reranging operation helps the user during transmitter calibration.When it is know the level of the tank, expressed in percentage, the liquid level, it is possible to input this percentage thatautomatically the transmitter recalculates its LRV and URV according to the new percentage value.This can be done using a HART configuration tool on a 2600T Transmitter.Two options are available as Output % Reranging operation:1) OP Range Low where both LRV and URV are adjusted2) OP Range High where only URV is change in accordance with the new input percentageAs example:ADDENDUM FOR OUTPUT % RERANGINGActual level measured by the transmitter:Transmitter output = 27%Calibration : LRV = -125 mbarURV = +340 mbara) New input level measurement (Option 1) = 30%New calibration : LRV = -139.5 mbarURV = +325.5 mbarThe transmitter output is now = 30%Starting again from the initial settings:Transmitter output = 27%Calibration : LRV = -125 mbarURV = +340 mbarb) New input level measurement (Option 2) = 30%New calibration : LRV = -125 mbarURV = +291.5 mbarThe transmitter output is now = 30%