Aalborg DPM Series Operating Manual page 59

3. Monitoring Alarm Events only (any active Alarm event will trigger LED
indication): GREEN/OFF (alternating every second)
4. Monitoring Diagnostic Events only (any active Diagnostic event will trigger
LED indication): RED/OFF (alternating every second)
5. Test and Configuration Communication Interface Monitoring:
5.1 Data Received (RX activity) RED LED flashing momentarily (about 200 ms
or less)
5.2 Data Transmitted (TX activity) GREEN LED flashing momentarily (about
200 ms or less)
6. Modbus Communication Interface Monitoring (optional):
6.1 Data Received (RX activity) RED LED flashing momentarily (about
200 ms or less)
6.2 Data Transmitted (TX activity) GREEN LED flashing momentarily (about
200 ms or less)
6. . 4 4 . . 1 1 3 3 . . 8 S S i i g g n n a a l l C C o o n n d d i i t t i i o o n n e e r S S e e t t t t i i n n g g s s
CAUTION: The signal conditioner parameters for your meter
were set at the factory to maintain the best performance. Do not
change Signal Conditioner parameters unless so instructed by
your factory technical support representative. Consult the factory
for more information.
6. . 4 4 . . 1 1 4 S S e e n n s s o o r r Z Z e e r r o o C C a a l l i i b b r r a a t t i i o o n
The DPM includes an auto zero function that, when activated, automatically
adjusts the differential pressure sensors to read zero. The initial zero
adjustment for your DPM was performed at the factory.
It is not required to perform zero calibration unless the device has zero reading
offset with no flow conditions or the absolute pressure sensor reading is not
accurate.
NOTE:
Before performing Zero Calibration, make sure the device is
powered up for at least 15 minutes and absolutely no flow condition is
established. For better results, it is recommended that you start Auto
Zero at least 30 minutes after power was applied to the flow meter.
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