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The D-FL 100 Measuring System works according to the
principle of mechanical effect. The probe has two separate chambers,
between which a pressure difference, caused by the flow in the duct,
builds up. The differential pressure resulting at the probe is
proportional to the square of the gas speed. Due to the probe’s
special shape, a highest possible differential pressure is produced,
whereby the linearity of the measuring signal is guaranteed.
On this basis, and taking the other flow parameters
into account, the volume flow can be converted from operational to
standard conditions by the D-FL 100-10 Microprocessor Evaluation
Unit. For this purpose, two additional current inputs (0-20 mA) for
a temperature probe and a pressure probe have been provided for at
the evaluation unit. If an emission evaluation computer is
available, which can compensate the pressure and
temperature-dependence of the gases and that calculates the actual
corrected value of the volume flow, the evaluation unit is not
needed. |
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According to TA-Luft pollutant emissions of industrial
plants must be monitored. For mass determination of the pollutants,
also the exhaust gas flow must be measured with the help of a
measuring device.
The DURAG D-FL 100 Measuring System continuously
determines the flow velocity and the flow rate of the exhaust gas.
Preselectable limit value surpassings are indicated inertia-free, so
permitting necessary interventions in the plant control system so as
to comply with prescribed emission limit values. |
