Hach AS950 Fonctionnement page 9

Table 5 Configuration options—US900X ultrasonic sensor (continued)
Option Description
Number of Holds Selects the number of times the last recorded data point is saved to the log if a
failed reading occurs due to echo loss. Options: 0 to 15 (default: 4).
For example, if the number of holds is 5, the last data point replaces the next
five consecutive failed readings or until a successful reading occurs.
Median Filter Selects the number of data points used in the median filter. The sampler takes
median of 3, 5, 7, 9 or 11 data points to decrease noise or outliers (default:
None). Only the median values are logged. Raw data values are not logged.
Advanced Settings
Sample Rate Selects the number of measurements done per second. Options: 1 to
10 (default: 4 seconds).
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 Selects the installation direction of the sensor. Select Reversed if the sensor is
Direction 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.
(optional) Options: –0.61 to 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.
For additional information, refer to the expanded user manual on the
manufacturer's website.
Table 6 Configuration options—AV9000S sensor
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