Rosemount 8712 - Page 106

Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
6-4
“Flowrate > 43 ft/sec” Flow rate is greater than 43 ft/sec Lower flow velocity, increase pipe diameter
Improper wiring Check coil drive wiring and sensor coils
Perform sensor test A - Sensor Coil (see Table 6-6 on page 6-9)
“Digital Trim Failure”
(Cycle power to clear
messages, no changes
were made)
The calibrator (8714B/C/D) is not
connected properly
Review calibrator connections
Incorrect calibration number
entered into transmitter
Replace sensor calibration number with 1000005010000001
Calibrator is not set to 30 FPS Change calibrator setting to 30 FPS
Bad calibrator Replace calibrator
Table 6-1. Rosemount 8712 Basic Diagnostic Messages
Message Potential Cause Corrective Action
Table 6-2. Rosemount 8712 Advanced Diagnostic Messages (Suite 1 - Option Code DA1)
Message Potential Cause Corrective Action
Grounding/Wiring Fault Improper installation of wiring See “Sensor to Remote Mount Transmitter Connections” on page 2-15
Coil/Electrode shield not
connected
See “Flowtube Sensor Connections” on page 2-17
Improper process grounding See “Grounding” on page 5-12
Faulty ground connection Check wiring for corrosion, moisture in the terminal block, and refer to
“Grounding” on page 5-12
Sensor not full Verify sensor is full
High Process Noise Slurry flows - mining/pulp stock Decrease the flow rate below 10 ft/s (3 m/s)
Complete the possible solutions listed under “Step 2: Process Noise” on
page 6-8
Chemical additives upstream of the
sensor
Move injection point downstream of the sensor, or move the sensor
Complete the possible solutions listed under “Step 2: Process Noise” on
page 6-8
Electrode not compatible with the
process fluid
Refer to the Rosemount Magnetic Flowmeter Material Selection Guide
(00816-0100-3033)
Air in line Move the sensor to another location in the process line to ensure that it is
full under all conditions
Electrode coating Use bulletnose electrodes
Downsize sensor to increases flow rate above 3 ft/s (1 m/s)
Periodically clean sensor
Styrofoam or other insulating
particles
Complete the possible solutions listed under “Step 2: Process Noise” on
page 6-8
Consult factory
Low conductivity fluids
(below 10 microsiemens/cm)
Trim electrode and coil wires - refer to “Installation” on page 2-1
Table 6-3. Rosemount 8712 Advanced Diagnostic Messages (Suite 2 - Option Code DA2)
Message Potential Cause Corrective Action
8714i Failed
Transmitter Calibration Verification
test failed
Verify pass/fail criteria
Rerun 8714i Meter Verification under no flow conditions
Verify calibration using 8714D Calibration Standard
Perform digital trim
Replace electronics board
Sensor Calibration test failed Verify pass/fail criteria
Perform sensor test - see Table 6-6 on page 6-9
Sensor Coil Circuit test failed Verify pass/fail criteria
Perform sensor test - see Table 6-6 on page 6-9
Sensor Electrode Circuit test failed Verify pass/fail criteria
Perform sensor test - see Table 6-6 on page 6-9