Model 8712C/U/H Magnetic Flowmeter Transmitters
5-4
Meter output is unstable Medium to low conductivity fluids (10–25
micromhos/cm) combined with cable
vibration or 60 Hz interference
Eliminate cable vibration:
• Integral mount
• Move cable to lower vibration run
• Tie down cable mechanically
• Trim electrode and coil wires
See Conduit Cables on page 2-7
• Route cable line away from other equipment
powered by 60 Hz
Electrode incompatibility Check the Technical Data Sheet, Magnetic Flowmeter Material
Selection Guide (document number 00816-0100-3033), for
chemical compatibility with electrode material.
Improper grounding Check ground wiring – see Mount the Transmitter on page 2-3 for
wiring and grounding procedures
High local magnetic or electric fields Move magnetic flowmeter (20–25 ft away is usually acceptable)
Control loop improperly tuned Check control loop tuning
Sticky valve (look for periodic oscillation
of meter output)
Correct valve sticking
Flowtube failure Perform the flowtube Tests A, B, C, and D on Table 5-3 on page 5-6.
Analog output loop problem Check that the 4 to 20 mA loop matches the digital value. Perform
analog output test.
TABLE 5-2. Advanced Troubleshooting–Model 8712C/U/H
Symptom Potential Cause Corrective Action
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