168
Reference Manual
00809-0300-4750, Rev CA
March 2016
White noise
This type of noise results in a high amplitude signal that is relatively constant over the
frequency range. Common sources of white noise include chemical reactions or mixing that
occurs as the fluid passes through the flowmeter and high concentration slurry flows where
the particulates are constantly passing over the electrode head. An example of this type of
flow stream would be a basis weight stream in a paper mill. This type of noise can be
mitigated by switching to the
37 Hz coil drive frequency and enabling the digital signal processing.
9.4.4
Troubleshooting coated electrode detection
In the event that electrode coating is detected, use the following table to determine the
appropriate course of action.
9.4.5
Troubleshooting 4-20 mA loop verification
In the event that the 4-20 mA Loop Verification fails, use the following table to determine
the appropriate course of action.
Table 9-4. Troubleshooting the Electrode Coating Diagnostic
(1)
1.
Only available with Field Mount Transmitter.
Error message
Potential causes of error
Steps to correct
Electrode
Coating Level 1
•Insulating coating is starting to build up
on the electrode and may interfere with
the flow measurement signal
•Process fluid conductivity has decreased
to a level close to operational limits of the
meter
•Verify process fluid conductivity
•Schedule maintenance to clean the electrodes
•Use bullet nose electrodes
•Replace the meter with a smaller diameter meter
to increase the flow velocity to above 3 ft/s (1 m/s)
Electrode
Coating Level 2
•Insulating coating has built up on the
electrodes and is interfering with the flow
measurement signal
•Process fluid conductivity has decreased
to a level below the operational limits of
the meter
•Verify process fluid conductivity
•Schedule maintenance to clean the electrodes
•Use bullet nose electrodes
•Replace the meter with a smaller diameter meter
to increase the flow velocity to above 3 ft/s (1 m/s)
Table 9-5. Troubleshooting the Analog Loop Verification Diagnostic
(1)
1.
Only available with Field Mount Transmitter.
Test
Potential cause
Corrective action
4-20 mA Loop
Verification
Failure
•Analog loop not powered
•Check analog loop wiring
•Check loop resistance
•Check analog loop power switch – see
•Check external supply voltage to the transmitter
•Check for parallel paths in the current loop
•Analog drift
•Perform D/A trim
•Transmitter failure
•Perform transmitter self-test
•Perform manual analog loop test
•Replace the electronics stack
Содержание Rosemount 8750W
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