Xylem DH-21 - Manual (Page 62)

4-16 Using the Graphical “W ATER LOG” Software
DH-21
the new “Next Log Time” has already occurred, the “ W ATER LOG” will continue to add the
logging rate to the new Next Log Time until the new Next Log Time is in the future. Then the
“
W
ATER LOG” will “WAKE-UP” to take the next sample.
There are five different modes the “ W
ATER LOG” sensor can operate under. Each Logging Mode
is briefly explained below:
Linear Mode:
The Linear Mode is the simplest and allows the sensor to log data at a set time interval
from once a second to once a day. Linear Mode is shown in Figure 4-9.
Delta Mode:
The Delta Mode is like the Linear Mode with the addition of not logging data if the data
is not changing. Delta Mode is shown in Figure 4-10.
Hyper Mode:
The Hyper Mode is like the Linear Mode with the addition of the ability to speed up the
logging rate based on the data rate of change. Hyper Mode is shown in Figure 4-11.
Hyper-Delta Mode:
The Hyper-Delta Mode is just as it sounds, a combination of the Hyper Mode and the
Delta Mode. Hyper-Delta Mode is shown in Figure 4-12.
Variable Mode:
The Variable Mode provides 6 time periods to be set up with different logging rates. The
length of the time periods can also be adjusted. This Logging Rate can be used to
simulate a logarithmic logging function. Variable Mode is shown in Figure 4-13.
4.4.3.1 Linear Logging Mode Option
The Linear Logging Mode shown in Figure 4-9 is configured to have a constant time between
each measurement. All that is needed to set up this mode is to select a logging rate from the list.
The current logging rate is the top item in the list. The scan rate list will provide several preset
intervals from once a second to once a day. Select the appropriate logging rate and click on the
“OK” button to program the “
W
ATER LOG” with the desired interval.