Hanna Instruments HI 2550 - Manual (Page 29)

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If stability logging is selected, a complete set of data is memorized every
time the reading becomes stable after an unstable condition.
To stop interval logging press LOG key again. The “LOG” tag will be
cleared.
Note: When pressing any key that is not active, while lot logging is
running, the following message is displayed for a few seconds.
followed by the number of free records:
If there are less than 6 memory locations remaining, the record number
and “Lo” message will be displayed to alert the user.
If the log space is full (200 records), “FULL LOG” message will be
displayed and no more data will be saved.
When LOG is pressed, a complete set of information is stored: date, time,
pH, mV, EC, TDS, NaCl temperature and calibration data.
LOT LOGGING
LOT LOGGING LOT LOGGING LOT LOGGING LOT LOGGING
Select “StAb” (stability logging) or the desired time interval.
To start interval logging press LOG key while the instrument is in
measurement mode.
When the selected interval is reached or when the reading is stable (for
log on stability), the instrument will display the current lot number on
the primary LCD line, the record number on the secondary LCD line and
the LOG tag (see example below: Lot 5 record 7)
followed by the number of free records on the corresponding memory
space.