DIFF automatic volume flow meter
User manual
V11.2 - EN
Page
8
TDC 16-7-2012
OBSERVATOR
instruments
3. The menu
The following menu will appear when the DIFF is powered.
You can scroll true the menu by rotating the control button. Push in the middle of the control
button to select the option.
3.1 Calibration
Calibration of the DIFF is necessary after powering. The ultrasensitive pressure sensor will be
adjusted to the environmental temperature.
It is advisable to let the DIFF acclimatize for a minimum of 15 minutes when there are
big differences in temperature. The DIFF has to be calibrated after the acclimatizing. It is
recommended to calibrate the DIFF from time to time during usage.
We recommend calibration of the DIFF every half an hour to secure the measuring accuracy.
It is necessary to calibrate the DIFF more often when the environmental temperature is changing
rapidly or when the DIFF has a temperature divergent from the environment.
Please note that the DIFF has to stand on a flat surface and the room has to be free of air flow.
When the DIFF is being calibrated the following screens will show up.
or
The last screen indicates that the calibration failed. The failure can be caused by air flows in the
room. Make sure that the DIFF is calibrated on a flat surface. You can put a flat object on top of
the DIFF to avoid airflow true the DIFF.
Menu
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Measurement
Storage
Calibration
Off
Settings
Calibration
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Calibrating…
Calibration
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Testing…
Calibration
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Successful.
Calibration
=======================
failed!
