9.3.2 Time of Day Datalogging
Programming Time of Day Datalogging
1. Select the Logger Program menu ( →→ F3:Logger F5:Program)
2. Select F2:Time of Day from the menu.
The display should now look similar to that shown below. Any currently programmed times are
displayed…
Log 00:00 00:00 00:00 00:00 00:00 00:00
Time 00:00 00:00 00:00 00:00 00:00 00:00
3. Use the Numeric Keypad to set the first time of the day at which the 90-FL will automatically
log into memory.
4. Press to move to the next time of the day.
5. Repeat steps 7 and 8 to enter up to 12 times of the day. The times do not need to be evenly
spread throughout the day. Times must be entered in 24 hour clock format.
6. Press to save the programmed times of the day and quit.
7. The Time of Day datalogging is now programmed, and can be started and stopped as required.
Notes
1. For 12:00 o’clock midnight, enter the time as “24:00”.
2. The times of the day do not need to be entered in chronological order. The 90-FL will sort
them after pressing .
Starting and Stopping Time of Day Datalogging
Starting and stopping Time of 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 Time of 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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