Nivetec Echo Smart Series, Руководство по эксплуатации и установке, Страница: 53 / 73

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9.2.7. GB Midpoint (Automatically set)
Automatic sensor initialization establishes the initial signal amplification (Gain)
that is appropriate for the process environment. This value is held in the GB
Midpoint register.
With Auto Gain ON, Gain increases and decreases around the Midpoint to maintain
optimal signal amplification. The Gain Band Parameter establishes the maximum
increase or decrease in Gain above and below the Midpoint.
With Save GB Midpoint (MP) set to ON, the midpoint can be manually set by the
user.
The range for GB Midpoint is: 0 to 100
9.2.8. Wall Zone ( 0.5 )
This parameter establishes a zone near the bottom of the tank that permits special
handling of a dominant signal that originates from the tank floor. The instrument
differentiates this signal from other signals in order to correctly calculate
measurements.
The range for Wall Zone is: 0.0 to 32.0
9.2.9. Wall Zone AG ( 40 )
This parameter limits gain amplification when the primary signal is a reflection
from the tank bottom. Since the desire is to track blankets, it prevents over-
amplification of the signal in applications with light-density material, or when the
tank bottom is the only signal present (tank has no suspended solids blanket or
settled solids).
The range for Wall Zone AG is: 0 to 100
9.2.10. Sound Speed ( 4862 fps )
Sound Speed is the transmit velocity the instrument uses to calculate Level and
Range Measurements. Changes to Sound Speed may be required to calibrate the
instrument for use if the process liquid is extreme in temperature or pressure, or is
other than water.
The range for Sound Speed is: 1000 to 6000 fps
9.2.11. Sensitivity ( 20 )
Sensitivity determines whether a signal is sufficient for tracking. Lower Sensitivity
to promote tracking a less well-defined signal (gradual slope or low amplitude
signal). Increase Sensitivity to produce the opposite effect.
The range for Sensitivity is: 0 to 100