Operating Instructions OIO 14en Edition 07/2017 23
Temperature compensation
Function description
Temperature compensation
Flowmeters of the OMG series can be equipped additionally with temperature sensors in the sizes OMG
13 to OMG100. Mounting of a temperature sensor in the piping is advisable for the size OMG140. If the
flowmeter is equipped with a temperature sensor, the current density of the flowing liquid can be
calculated from this measured value by means of a density table stored in the electronics unit. A
normalized volume measurement is then possible at which the displayed values are converted to a
reference temperature that can be selected freely. This ensures that measuring errors caused by
changes in the density due to temperature variations are avoided.
Flow direction detection
Systems with a changing flow direction as well as systems with pressure pulsations - that can also
cause a reversal of the flow direction - require the use of a second pick up, see "Connection for the pick
ups", page 30. This additional phase-offset signal and the incremental encoding inputs available in the
KRAL electronic unit can be used to determine the direction of flow and to take it into consideration
when calculating the total values.
Junction box
The manufacturer offers a junction box that facilitates the electrical connection of the various sensors for
the flowmeters of the OMG series. Further information see "Accessories", page 51.
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