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Measurement Definition
Chapter 4
Range S
As the rotor grows due to steam heating, the target surface moves away
from the rotor short probe, and toward the rotor long probe. As it
expands, the short side target eventually moves beyond the usable
(linear) range of the short side probe – Range S.
The module uses the settings for the "Xdcr High Limit (V DC)" and
"Xdcr Low Limit (V DC)", on the HW Configuration page, to define
the limits of the range for each probe.
Gap L
The gap between the rotor long probe and the rotor long side of the
target.
Range L
As the rotor grows due to steam heating, the target surface moves toward
the rotor long probe, and away from the rotor short probe. Until the
rotor has expanded sufficiently, the long side target is beyond the usable
(linear) range of the long side probe – Range L.
The module uses the settings for the "Xdcr High Limit (V DC)" and
"Xdcr Low Limit (V DC)", on the HW Configuration page, to define
the limits of the range for each probe.
Crossover
The crossover range is the area where both probes are measuring within
their linear ranges.
While the crossover range can reduce the total possible range of the
combined sensors, it is important in that it helps prevent large jumps in
the expansion measurement as the target moves out of the range of one
probe and into the range of the second probe.
Sense Control
Sense Control indicates the direction of movement of the rotor target
surface relative to the sensor tip as the rotor expands or contracts during
heating and cooling. Movement away means that during heating, the
rotor target surface is away from the sensor tip. Movement toward
indicates that during heating, rotor growth is toward the sensor.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
175
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