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Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 181
Measurement Definition Chapter 4
Output
The Complementary Differential Expansion measurement, in mils (mm), or
other EU, is output to the associated tag as shown in
Figure 75 . The individual
channel DC volt values are provided in their respective tags.
Figure 75 - Differential Expansion Tag (Channels 2 and 3)
Figure 75 illustrates the tag that is created for a channel 2/3 measurement. If a
channel 0/1 measurement is defined, the tag is
“Ch0_1DifferentialExpansion”.
Figure 75 also shows the Bias/Gap tags for the
channels, which have been added on the Inputs page, for the Differential
Expansion channel pair.
Ramp Differential Expansion Measurements
Ramp/Differential Expansion is used when one or both of the sensors are
installed such that they monitor the movement of an angled surface, or “ramp”.
This method can be applied using either of three orientations, as illustrated in
Figure 76 .
Figure 76 - Ramp Differential Expansion Probe Arrangements