Hanna Instruments PCA 300 Series - Manual (Page 24)

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Press DIAG. “0.00” will appear on the display and the two
levels will be set to the current value.
SAMPLING RATE
The sampling rate is user-selectable from a minimum of a
measurement every 5 minutes to a maximum of one every 90
minutes.
It is possible to recall and change the interval between two
different measurements at any given moment.
Simply press SET TIME.
Select the desired interval between 5 and 90 using the and
keys. The unit will not allow the user to enter a value less
than 5 or greater than 90.
Press SET TIME twice to store the new sampling
interval setting and revert normal operational
mode.
SET
TIME
DIAG
SET
TIME