Xylem DH-21 - Manual (Page 24)

3-6 Using the “W ATER LOG” Software
DH-21
3.2.3 Logging Mode Option
Options 5, 6, and 7 configure the “ W ATER LOG” for unattended logging. Option 5 is shown in
Figure 3-4. 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. Then when the selected measurement time interval has
elapsed, which is specified in option 5, the “
W
ATER LOG” will “WAKE-UP” and take a
pressure, temperature and battery measurement. It will then store the data in FLASH EEPROM
with a time-stamp, and go to “SLEEP” again.
The time between samples can range from 1 second up to 24 hours. If the logging rate is less
than 6 seconds, the “
W
ATER LOG” 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
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.
The WaterLOG Serial # T2000 Version 1.1
Status = RESET (LINEAR) Last Measurement Units
Date/Time = 02/28/95 03:50:24
Date Started = 01/01/95 14:39:00 PRESSURE = 0.0000 PSI
Logging Rate = 00:01:00 TEMPERATURE = 0.00 Deg C
Next Log Time = 00:00:00
Memory Used = 0.0 %
Logging Count = 0 Scans
Battery = 6.8 Volts
1) Run 4) Time/Date 7) User Notes 10) Measure Data
2) Off 5) Logging Mode 8) Extract Data 11) Zero Sensor
3) Reset 6) Coefficients 9) View Data 12) Sensor Info
13) Diagnostics
Enter Option: 5 Esc-Exit
Logging Mode
1) Linear Mode 4) Hyper-Delta Mode
2) Delta Mode 5) Variable Mode
3) Hyper Mode
Enter Option: 1 Esc-Exit
Figure 3-4. Logging Rate Option