Hach AS950 Operation Manual page 10

Table 5 Configuration options—US900X ultrasonic sensor (continued)
Option Description
Min Dist Selects the minimum distance from the sensor to the water. Options: 0.13 to 3.96 m
(5.25 to 150.75 in.). Distances less than the minimum distance of the sensor are ignored.
Max Dist Selects the maximum distance from the sensor to the water. Options: 0.13 to 3.96 m
(10.50 to 156.00 in.). Distances more than the maximum distance of the sensor are
ignored.
Profile Do not change this setting without guidance from technical support. This setting is used to
increase the performance of the sampler when the sampler is used in very difficult
conditions. Options: Free Air Low, Free Air Mid (default), Free Air High, Stilling Tube Low,
Stilling Tube Mid or Stilling Tube High.
Transmit Power Do not change this setting without guidance from technical support. This setting is used to
increase the performance of the sampler when the sampler is used in very difficult
conditions. Options: 2 to 30 (default: 10).
Option Description
Basic Settings
Sensor Direction Selects the installation direction of the sensor. Select Reversed if the sensor is installed in the
reverse direction. Options: Normal (default) or Reversed.
Sensor Offset Sets the offset used to adjust the measured level value to the correct value.
Sediment Enters the level of sediment in the bottom of the channel. Options: 0.00 to 0.30 m (0.00 to
12.00 in.).
Level Offset Enters the difference between the measured level and the actual level. Options: –0.61 to
(optional) 0.61 m (–24.00 to 24.00 in.). Use to correct an offset error without having to do a calibration.
Flow Settings
Device Selects the primary device. Enters the device specifications. Refer to
Advanced Settings
AV9000S Level Filter Settings—Selects the type of filter and the filter size (factory default is none). Takes the
average and/or median of 3, 5, 7, 9 or 11 data points to reduce noise or outliers. Only the
average and/or median values are logged—raw data values are not logged. A significant
delay can occur before sudden changes in flow are logged, therefore this option is not
recommended for stormwater applications. Options: None, Average, Median or Average and
Median.
AV9000S Neg. Vel to Zero—Enable to replace all negative velocity measurements with 0. Site
Velocity Multiplier—The value that adjusts the sensor velocity reading to be the same as the velocity
reading from a different instrument. If not sure, use the default value of 1.0. Low Level
Cutout—Forces the velocity to a substitute value when the level measurement is below a
user-specified value. The value of the substitute velocity is typically 0. The factory default is
enabled at 0.8 inches. Filter Settings—Selects the type of filter and the filter size (factory
default is none). Takes the average and/or median of 3, 5, 7, 9 or 11 data points to reduce
noise or outliers. Only the average and/or median values are logged—raw data values are not
logged. A significant delay can occur before sudden changes in flow are logged, therefore this
option is not recommended for stormwater applications. Options: None, Average, Median or
Average and Median.
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Table 6 Configuration options—AV9000S sensor
Table 7.