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Omega FMA 4000 User Manual Page 20

Digital mass flow meters.
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Figure b-6: FMA 4000 Screen in the beginning of Auto Zero procedure.
The Auto Zero procedure normally takes 1 - 2 minutes during which time the DP
Zero counts and the Sensor reading changes approximately every 3 to 6 seconds.
Figure b-7: FMA 4000 during the Auto Zero procedure.
The nominal value for a fully balanced sensor is 120 Counts. If the FMA 4000's
digital signal processor was able to adjust the Sensor reading within 120 ± 10
counts, then Auto Zero is considered successful. The status LED will return to a
constant GREEN light and the screen below will appear:
Note: The actual value of the Sensor and DP counts will vary for each
FMA 4000.
If the device was unable to adjust the Sensor reading to within 120 ± 10 counts,
then Auto Zero is considered as unsuccessful. The constant RED light will appear
on the status LED. The user will be prompted with the "AutoZero ERROR!" screen.
Note: For FMA 4000 with RS232 option all Auto Zero status info
available via digital communication interface.
AUTOZERO IS ON!
AUTOZERO IS ON!
S:
AutoZero is Done
S:
Figure b-7: FMA 4000 during the Auto Zero procedure.
405
DP: 512
122
DP: 544
16

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