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40415 - Sample Rate
Sets the time delay between samples taken by the sensor (50 - 1000 ms). While shorter time delays allow for
quicker sensor response times to changing levels, longer sample rate delays reduce the likelihood of echo-
based false positives. Also, longer sample rates result in longer sensor life.
40416 - Multiplier
Calibrates the sensor for changes in the speed of sound due to variations in atmospheres. The Multiplier
is shown by the values 1 - 1999, but these values are understood to represent 0.001 - 1.999. The default of
1,000 (i.e., 1.000) is used for most applications. See the Calibration section of Chapter 4.
40417 - Offset
Sets the Zero Point of the sensor, the point from which the calculated distance is measured. When the
Offset is set to 0, the Zero Point of the sensor is at the face of the transducer (See Figure 3.1). A positive
setting will move the Zero Point forward, in front of the sensor face (See Figure 3.2). Setting the Offset to a
negative number will move the Zero Point backward, behind the sensor face (See Figure 3.3).
In all cases, Blanking (Holding Register 40410) is measured from the end of Offset, and the effective
measurement zone of the sensor begins at the forward end of Blanking. If Offset is more negative than
Blanking is positive, the net difference will be a loss in sensor maximum range (See Figure 3.3).
Zero
Point
Sensor
Max.
Distance
Blanking
Effective
Measurement Zone
Offset = 0
Zero
Point
Sensor
Max.
Distance
Blanking
Effective
Measurement Zone
Offset > 0
Offset
Zero
Point
Sensor
Max.
Distance
Blanking
Effective
Measurement Zone
Offset < 0
Offset
Sensor
Max. minus
Offset
Figure 3.1
Figure 3.2
Figure 3.3
40420 - Temperature Compensation
Activates or deactivates the MNU IS’s internal temperature compensation circuit (1 = On, 0 = Off). The
speed of sound changes with changes in temperature, therefore changes in temperature affect distance
measurements. These effects can be minimized by activating temperature compensation.
40414 - Out of Range
Sets the number of consecutive samples outside the Filter Window (Holding Register 40413) necessary to
automatically adjust the current reading and move the Filter Window.
Содержание MNU IS Series
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