Xylem DH-21 - Manual (Page 70)

4-24 Using the Graphical “W ATER LOG” Software
DH-21
Number of Samples:
The bottom half of the screen has 5 boxes labeled “Time 1” to “Time 5”. This represents
the time periods 1 to 5. The number in each box is the number of scans that will be done
during that time period. There are six time periods, but only options to set the number of
scans for the first five. This is because the last time period will log data at the specified
rate until you stop the logging process. Setting the number of scans to zero for a time
period will cause that time period to be skipped.
As mentioned, this mode is used to simulate a logarithmic logging mode. Below is a simple setup
showing a logarithmic type logging setup.
Time between samples Number of samples Time Interval
(Rate) (Samples)
Logging Rate 1 00:00:02 59 0 - 2 min.
Logging Rate 2 00:00:15 32 2 min. - 10 min.
Logging Rate 3 00:02:00 25 10 min. - 1 hr.
Logging Rate 4 00:15:00 28 1 hr. - 8 hrs.
Logging Rate 5 02:00:00 32 8 hrs. - 72 hrs.
Logging Rate 6 12:00:00 On going 72 hrs. -
This example shows the logging rate starting out fast and then slowing down. The rate can be
change as needed; slow to fast, fast to slow, and back to fast. etc.