Observator Instruments DIFF, Руководство пользователя

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DIFF automatic volume flow meter
User manual
V11.2 - EN
Page 9
TDC 16-7-2012
OBSERVATOR
instruments
3.2 Measurement
The DIFF starts to measure immediately once the option is selected from the menu. Make sure
that the following is prepared before measuring:
Close doors and windows, the wind can create pressure waves that influence the measurement.

Put the square opening of the DIFF against the vent. When sure that the vent is fully
covered the measurement can be started. The measurements can be faulty when the
measurement is started before the DIFF is in place.

The DIFF will start with a pre-measurement. You can hear the motor starts running. The
pre-measurement will be followed by the final measurement.

Wait until the measurement is completed. The measurement can take tens of seconds.
The display will show the instantaneous flow and temperature value. This value is not
reliable because the DIFF is still compensating the measurement.

There will sound a beep when the measurement is finished. The value shown on the
display is the measured value. You can remove the DIFF from the vent.
The plus sign indicates that an air inlet is being measured. It is also indicated on the upper left of
the display.
A negative sign indicates that an air exhaust is being measured. It is also indicated on the upper
left of the display.
The battery status is indicated by the blocks on the upper right of the display. It is recommended
to charge and/or replace the batteries when the battery status reaches the value of one block.
The air temperature of the air flowing through the DIFF is shown below the battery indication.
You can return to the menu by pressing the selection button. The measured value won’t be
available anymore.
Comments:
The motor can reach a RPM of thousands of rounds per minute. This can create a high pitched
tone which is normal.
Measurement duration:
The duration depends on the amount of airflow going through the DIFF. The DIFF will measure
faster when the airflow is higher.
3.3 Storage
The storage function is available as an option. We refer to chapter 7 for more information.
Supply ■■■■
Airtemp 24.5 ˚ C
Airflow [M3/H]
+47.6