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Reference Manual
00809-0100-4444, Rev AC
Section 3: Advanced Installation Details
January 2015
Advanced Installation Details
Figure 3-11. Discrete Input Operating Range
3.5 Process reference connection
Establishing a process reference for the sensor is one of the most important details of sensor
installation. Proper process reference creates the lowest noise environment for the transmitter
to make a stable reading. Refer to Table 2-10 on page 22 to determine which option to follow for
proper installation.
Note
Consult factory for installations requiring cathodic protection or situations where there are high
electrical currents or high electrical potentials present in the process.
3.6 Coil housing configuration
The coil housing provides physical protection of the coils and other internal components from
contamination and physical damage that might occur in an industrial environment. The coil
housing is an all-welded and gasket-free design.
The 8705 model is available in four coil housing configurations. Configurations are identified by
the M0, M1, M2, or M4 options codes found in the model number. The 8711 and 8721 models
are only available in one coil housing coil configuration; a separate option code is not available.
0
5
10
15
20
25
30
2.5
5
7.5 10
12.5 15
0
Digital Input Operating Range
Supply Voltage
Series Resistance Ωin + Ωext (Kohms)