Measurement Procedure Gas Analysis: Flow Measurement Pitot Tube (Option) - Ecom EN3 Operating Instructions Manual

4.4 Measurement procedure gas analysis: Draught measurement
A trend indication for the draught conditions in the exhaust channel can already be viewed
during the gas analysis. Nevertheless the value for the chimney draught will not be stored
together with the gas values while pressing <Save> because the differential pressure sensor
tends to drifts because of its sensibility. For an exact measurement, it is consequently
advised to re-calibrate this sensor just before sampling and documenting the value.
The display shows the current value as well as the recommendation to re-set the zero point
of the sensor. Disconnect the draught hose from the instrument for a short moment and
press <F4>. The sensor is herewith re-calibrated.
Re-connect the draught tubing. The display shows the exact measurement value which can
be stored while pressing <Record> and added to those results previous stored in the
intermediate memory. The stored value is shown on the display. Press <ESC> to exit the
draught measurement menu.

4.5 Measurement procedure gas analysis: Flow measurement Pitot tube (option)

This measurement can be done with a Pitot tube. At first the pitot factor of the pitot tube must
be entered („Adjustments" / „Internal" / „Pitot factor"). After connecting the Pitot tube to the
instrument, the zero point of the sensor can be set with <F4>. With <F1> the cross section of
the flow channel can be entered (needed for calculation of the flow rate). After the Pitot tube
is positioned in the flow channel, the display shows the speed (m/s) and the flow rate
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(Nm /h). If the value indicated is stable, press <Save> to store the value in the intermediate
memory. If a printout of the values should occur simultaneously to the recording in the
intermediate memory, press <F2> (the complete content of the intermediate memory will be
printed out).
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Connections for Pitot tube
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Measurement stored
in intermediate
memory
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ecom-EN3