9.3.1 Rate per Day Datalogging
Programming Rate per Day Datalogging
1. Select the Logger Program menu ( →→ F3:Logger F5:Program)
2. Select F1:Rate per Day from the menu.
The display should now look similar to that shown below. The current Rate per Day is
displayed…
Number of Readings per Day : 24
3. Use the Numeric Keypad to set the number of readings per day which the 90-FL will
automatically log into memory. This can be set from 1 to 288 (ie. 1 reading every 24 hours to
1 reading every 5 minutes).
Press to save the Rate per Day.
Press to quit without changing the current setting.
4. The Rate per Day datalogging is now programmed, and can be started and stopped as required.
Notes
1. The 90-FL distributes the number of readings evenly throughout a 24 hour clock cycle,
regardless of what time automatic logging is started and stopped. For example, if the 90-FL is
programmed to log 4 readings per day, they will be logged at 24:00, 6:00, 12:00 and 18:00
o’clock.
Starting and Stopping Rate per Day Datalogging
Starting and stopping Rate per Day datalogging is a two step process…
1. Select the Logger menu ( →→ F3:Logger)
Select F4:Start from the menu.
2. Switch the 90-FL OFF.
This step is essential, as the Rate per Day datalogging is only enabled when the 90-FL is
switched OFF.
Notes
1. The 90-FL remains dormant between readings and only switches itself ON when a reading is
due.
2. If the Dissolved Oxygen stirrer is enabled, it is switched on for 40 seconds before the reading is
recorded.
3. The 90-FL is switched on 3 minutes before the next reading is due to ensure that the Dissolved
Oxygen sensor is fully polarised. The unit will therefore not automatically log any readings for
at least 3 minutes after it has been switched OFF, even if a reading is due during that time.
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