Xylem DH-21 - Manual (Page 61)

DH-21
Using the Graphical “W ATER LOG” Software 4-15
4.4.3 Logging Mode Option
Logging Mode, Coefficients, and User Notes configure the “ W ATER LOG” for an unattended
logging session. The Logging Mode Option is shown in Figure 4-8. The logging rate indicates the
elapsed time between measurements. The “
W ATER LOG” clock circuitry allows the
“ W
ATER LOG” to enter a low-power “SLEEP” mode of operation between measurements. When
the time interval has elapsed, which is specified in Logging Mode, the “ W
ATER LOG” will
“WAKE-UP” and take a pressure, temperature and battery voltage measurement. It will then
store the data in FLASH EEPROM with a time-stamp, and then go to “SLEEP” again.
Figure 4-8. Logging Mode Option
The time between samples will range from 1 second up to 24 hours. If the logging rate is less
than 6 seconds, the “
W ATER LOG” when running, will not go to “SLEEP”.
The “ W
ATER LOG” “WAKES-UP” and takes a measurement when the time in the DATE/TIME
field matches the “Next Log Time”. The “Next Log Time” is incremented by the logging rate. If