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INSTRUCTION MANUAL 10DX3111A&G Sizes 14 - 24 Inches
The Signal Converter options available for use with the Magnetic Flowmeter are:
• remotely mounted 50XM1000N Microprocessor-based Signal Converters
• remotely mounted M2 Microprocessor-based Signal Converter
3. Possible causes of erroneous flow rate indication are:
• incorrect grounding
• excessive noise due to a heavy slurry process
or a non-homogeneous process
• loose or intermittent wiring
• non-full or empty meter pipe
• excess air entrained in process liquid
• fluid conductivity below specified minimum
6.3 Static Test
If the Magnetic Flowmeter does not appear to be operating properly, the following resistance
measurements can be made to establish whether an electrical malfunction has occurred. An analog
multimeter is required for checking the electrodes. Either an analog or digital multimeter can be used
for checking the coils. These measurements can be made at the flowmeter PC board.
ELECTRICAL SHOCK HAZARD. Equipment powered by an ac line
voltage presents a potential electric shock hazard. Make certain that the
system power is disconnected before making the following ohmmeter
6.3.1 Magnet Coil Check
6.3.1.1 Model 10DX3111A
Verify that the system power service has been de-energized. Measure the resistance between
terminals M1 & MR on the Primary connection board. The indicated resistance reading should be
within the ranges shown in TABLE 6-1. A reading significantly outside this range or a short circuit
between leads indicates defective coil(s).
Next, unsolder the M1 and MR wires from the Primary connection circuit board. Measure the
resistance from each of these wires to the flowmeter body. Resistance from either of these leads to
the body should be greater than 5 MΩ. A low resistance reading may indicate that moisture has
entered the meter interior. Re-solder the M1 & MR wires to the circuit board when this step has been
completed.
Measure the resistance between terminal 16 of the Primary connection board and the flowmeter
body. This resistance should measure between 10Ω and 500Ω.
WARNING
checks.
6-3
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