Hanna Instruments HI 9146 - Manual (Page 12)

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To freeze the first stable reading on the LCD
press
AutoEnd while the instrument is in
measurement mode.
The ”
HOLD” tag will be displayed blinking on
the LCD until the reading will stabilize.
When the reading is stable, the “
HOLD” tag
stops blinking and the reading is frozen on
the LCD.
Press
AutoEnd again to return to normal
measurement mode.
Note: • Pressing Range the instrument will skip to the displayed
range, without leaving AutoEnd mode.
• Pressing Setup then GLP, the instrument leaves AutoEnd
mode and performs the selected function.
HI 7040
HI 7040
Calibrate the instrument frequently, especially if high accuracy is required.
The instrument can be calibrated in maximum 2 points: 0.0% (
zero
calibration) and 100.0% (slope calibration).
The calibration of this instrument is very simple.
Before proceeding with the calibration, make sure the probe is ready for
measurements (see page 8), i.e. the membrane cap is filled with electrolyte
and the probe is connected to the meter and properly polarized.
For an accurate calibration, it is recommended to wait at least
15 minutes to ensure precise conditioning of the probe.
The zero calibration of the
HI 9146 is very stable,
therefore this procedure needs to be performed only
whenever the probe or the membrane is replaced.
However, because the slope calibration is more critical,
it is recommended to perform this procedure every week.
D O C A L I B R A T I O N D O C A L I B R A T I O N D O C A L I B R A T I O N D O C A L I B R A T I O N D O C A L I B R A T I O N