YSI 600DW-B Sonde - Manual (Page 100)

Sondes Section 2
------------Data filter setup----------
1-(*)Enabled
2-( )Wait for filter
3-Time constant. . .
4-Threshold. . .
Select option (0 for previous menu):
Choosing 3-Time Constant will display the following:
------------Time constant ----------
1- Turbid=12
2- Chl=12
3- Other=4
Select option (0 for previous menu):
Recommended settings for time constants are turbidity 12, rhodamine WT 12, chlorophyll 12, and “other”
4. Note that the time constant can be set independently for turbidity, chlorophyll, and rhodamine WT and
that time constant choices are only available for activated sensors. Rhodamine WT would appear in the
display below if it had been activated as a sensor. All “other” sensors use the same time constant as shown
below.
Choosing
4-Threshold will display the following:
---------------Threshold--------------
1-Turbid=0.01
2-Chl=1
3-Other=0.001
Select option (0 for previous menu):
Setting thresholds is done in the same manner. Recommended threshold settings are 0.01 for turbidity, 1.0
for chlorophyll, 1.0 for rhodamine WT, and 0.001 for “other”.
The following descriptions provide additional information about the Data Filter feature.
1-(*) Enabled. Activating this item will result in data filtering according to the values set in (2), (3), and
(4).
2-(*) Wait for filter. If this feature is activated, readings will be available for output only after the unit has
warmed up for a time period equal to the Time Constant plus an extra 4 seconds. This feature is useful, for
example, if you are operating in SDI12 mode and want to average the data over a particular period of time.
In such a case, you would not want the filter to be engaging and disengaging, so the value of the Threshold
should be set to a large value like 1. This feature should not be activated for normal use of the sonde.
YSI Incorporated Drinking Water Monitoring Systems Operations Manual 2-93