Xylem DH-21 - Manual (Page 25)

DH-21
Using the “W ATER LOG” Software 3-7
There are five different sampling 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 3-5.
Delta Mode:
The Delta Mode, like the Linear Mode, allows for the selection of a fixed sample interval
between 1 second to 24 hours. However, there is an addition of being able to set the
minimum amount of level change required before data will be logged. This feature saves
memory. Delta Mode is shown in Figure 3-6.
Hyper Mode:
The Hyper Mode, also like the Linear Mode, allows for the selection of a fixed sample
interval between 1 second to 24 hours. The Hyper Mode, however, allows for the entry of
a level change between the pass and current measurement (rate of change) that will cause
the
“W ATER LOG” to increase the logging rate based on a predetermined value. The
Hyper Mode is shown in Figure 3-7.
Hyper-Delta Mode:
The Hyper-Delta Mode is a combination of the Hyper Mode and the Delta Mode. The
Hyper-Delta Mode is shown in Figure 3-8.
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 3-9.