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Programming Features
Appendix C
Figure 56 Deadband Concept
Data Log
From the Main Menu, select SETUP > ADVANCED OPTIONS > DATA LOG.
The 980 Flow Meter can record up to 115,630 readings from any or all input
channels and store them in solid state, battery-backed memory for later
viewing or retrieval.
This option selects logged input channels, the frequency of logged
channels (Logging Interval), and explains what to do when the memory
becomes full.
Logging Intervals
Logging Intervals are designed to optimize the available memory so that
readings can be logged for a longer period of time. A Logging Interval is the
time period over which readings are taken and then averaged.
Note: The Review All Items
selection from the Setup menu
indicates the maximum available
logging hours for the channels and
recording intervals you selected.
The flow meter calculates this
information when the program is run
using the
RUN/STOP key.
Logging Interval—Continuous Mode
When a one-minute logging interval is selected, a reading will be taken
approximately every second but no data are logged until the logging interval
ends. At that time, the readings are averaged over the logging interval; that
average is logged.
When a five-minute logging interval is selected, readings are still taken every
second but the data are not logged until the five-minute logging interval ends.
At that time, the readings are averaged over the previous five minutes; that
average is logged.
Longer logging intervals result in a longer total recording time. Lower
resolution also occurs since more averaging is done at higher logging
intervals. Choose the shortest logging interval possible, while still making data
collection convenient. Pick a logging interval that almost fills memory over the
course of one month if data will be collected monthly.
7.60
7.40
7.20
7.00
6.80
6.60
6.40
pH
Alarm Off
Alarm On
Deadband
Low Alarm Setpoint= 6.9 pH
Table 29 Logging Intervals vs. Total Recording Time for Each Memory Configuration*
Logging Interval
Total Recording Time (days) before memory is full with 512K Bytes of RAM
(approx. 115,630 readings)
180
2160