Model 8712C/U/H Magnetic Flowmeter Transmitters
2-14
FLOWTUBE
CONNECTIONS
This section covers the steps required to physically install the
transmitter including wiring and calibration.
Rosemount Flowtubes
To connect the transmitter to a Rosemount flowtube, refer to the
appropriate wiring diagram in Appendix B. The calibration procedure
listed below is not required for use with Rosemount flowtubes.
Flowtubes of Other
Manufacturers
Before connecting another manufacturer’s flowtube to the Model 8712U
transmitter, it is necessary to perform the following functions.
1. Turn off the ac power to the flowtube and transmitter. Failure to
do so could result in electrical shock or damage to the transmitter.
2. Verify that the coil drive cables between the flowtube and the
transmitter are not connected to any other equipment.
3. Label the coil drive cables and electrode cables for connection to
the transmitter.
4. Disconnect the wires from the existing transmitter.
5. Remove the existing transmitter. Mount the new transmitter. See
Mount the Transmitter on page 2-3.
6. Verify that the flowtube coil is configured for series connection.
Other manufacturers flowtubes may be wired in either a
series or parallel circuit. All Rosemount magnetic flowtubes are
wired in a series circuit.
7. Verify that the flowtube is in good working condition. Use the
manufacturer’s recommended test procedure for verification of
flowtube condition. Perform the basic checks:
• Check the coils for shorts or open circuits.
• Check the flowtube liner for wear or damage.
• Check the electrodes for shorts, leaks, or damage.
8. Determine the coil resistance value of the flowtube. Record this
value for the Universal Auto Trim function.
9. Connect the flowtube to the transmitter in accordance with
reference wiring diagrams. See Appendix B Wiring Diagrams
for specific drawings.
10. Connect and verify all connections between the flowtube and the
transmitter, then apply power to the transmitter.
11. Perform the Universal Auto Trim function as explained
on page 4-5.
This is a pulsed dc magnetic flowmeter. Do not
connect ac power to the flowtube or to terminals
1 and 2 of the transmitter, or replacement of the
electronics board will be necessary.
See Safety Messages on page 2-1 for complete warning information.
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