Teledyne ADFM Analog Output Module, Technical Manual, Page: 151 / 156

ADFM Analog Output Module
Table E-4: Symptom: Unusual or Erroneous Output Readings
Possible Cause(s) Test/Corrective Action(s)
Improper Calibration Compare analog output(s) with display values
Check calibration of DGH module(s)
Test DGH module output(s)
Test/verify plant equipment inputs
Improper Scaling Compare ADFM output data to ADFM Analog Output
Module’s display and analog output(s)
Verify module’s units and scale settings
Verify plant equipment scaling
Unusual or
Erroneous ADFM
data Compare ADFM output data to ADFM Analog Output
Module’s display and analog output(s)
Review raw ADFM data for possible cause(s)
Contact MGD Technologies Inc.
Data reduction
errors in ADFM
Analog Output
Module or in the
ADFM Contact MGD Technologies Inc.
Table E-5: Symptom: Noisy or Erratic Output Readings
Possible Cause(s) Test/Corrective Action(s)
Normal fluctuations
in flows None
Hydraulic influence
from upstream or
downstream facilities None
Limits of precision
for ADFM, ADFM
Analog Output
Module, or plant
equipment Review scaling of analog outputs
Contact MGD Technologies Inc.
Insufficient velocity
signal strength Check for sediment accumulation at transducer
Increase acoustical reflectivity of flow stream
Contact MGD Technologies Inc.
ADFM Technical Manual (January 2000) page E-13