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Reference Manual
00809-0100-4727, Rev EA
October 2010
Rosemount 8700 Series
www.rosemount.com
Section 3
Operation and Maintenance
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1
Material Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-3
Magnetic Flowmeter Sizing . . . . . . . . . . . . . . . . . . . . . . . . page 3-4
This section covers basic operation, software functionality, and basic
configuration procedures for the Magnetic Sensor. For more information about
the technology and the function blocks used in the sensor, refer to
Appendix A: Reference Data and Appendix C: Field-Removable Electrodes.
CALIBRATION
Rosemount sensor are wet calibrated at the factory. They do not need further
calibration during installation.
GROUNDING
Process grounding the sensor is one of the most important details of sensor
installation. Proper process grounding ensures that the transmitter amplifier is
referenced to the process. This creates the lowest noise environment for the
transmitter to make a stable reading. Use Table 3-1 to determine which
grounding option to follow for proper installation.
NOTE
Consult factory for installations requiring cathodic protection or situations
where there are high currents or high potential in the process.
The sensor case should always be earth grounded in accordance with
national and local electrical codes. Failure to do so may impair the protection
provided by the equipment. The most effective grounding method is direct
connection from the sensor to earth ground with minimal impedance.
The Internal Ground Connection (Protective Ground Connection), located
inside the junction box, is the Internal Ground Connection screw. This screw
is identified by the ground symbol:
Table 3-1. Grounding Installation
Grounding Options
Type of Pipe
No Grounding Options
Grounding Rings
Grounding Electrodes
Lining Protectors
Conductive Unlined Pipe
Not Required
Not Required
Conductive Lined Pipe
Insufficient Grounding
See Figure 3-2
Non-Conductive Pipe
Insufficient Grounding
See Figure 3-3
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