68
***********************
AUTO ZERO IS
DONE!
**********************
Press any Key...
The status LED will return to a constant GREEN light and the screen below will appear:
Figure 39: Sensor Auto Zero Completed
If the device was unable to adjust the sensor reading to within 0±7 counts, then Auto Zero is
considered unsuccessful. A constant RED light will appear on the status LED. The user will be
prompted with the “Auto Zero ERROR!” screen. If additional Auto Zero procedures yield the
same error message, the sensor is most likely defective; arrange to return the instrument for
service.
NOTE: To initiate Differential Pressure Sensor Auto Zero Calibration using the
multifunctional maintenance push button, see Section 6.5.
6.4.16.2 Start AP Auto Tare
The DPC instrument is equipped with a high accuracy, high resolution absolute pressure
sensor which was calibrated at the factory and does not require additional calibration. De-
pending on actual installation conditions, however, during operation it may periodically re-
quire the auto tare procedure to increase accuracy.
CAUTION: The AP Auto Tare procedure must be performed with absolutely no
fl ow conditions. Make sure both inlet and outlet ports of the instrument are
connected to the atmosphere.
NOTE: Before performing AP Auto Tare, make sure the device is powered for
at least 15 minutes and absolutely no fl ow condition is established. For best
results, we recommend starting AP Sensor Tare at least 30 minutes after power
was applied to the instrument.
The AP Sensor Tare procedure requires high accuracy (at least 0.2% of reading)
absolute pressure sensor reference standard. The AP sensor Tare result will be
as accurate as your reference absolute pressure sensor is.
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