Hanna Instruments HI9126 User Manual
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MEM & MR FUNCTIONS
Pressing the MEM key will memorize the reading on the display and
store it in the internal memory. The pH (mV) and temperature,
electrode condition and the buffers used for calibration will be stored.
The “MEMORIZE” tag blinks and the display remains frozen until the
MEM
key is pressed again.
ORP MEASUREMENTS
To perform ORP measurements, connect an optional ORP electrode
(see “Accessories“ section) to the meter and turn it ON.
If necessary, enter the “mV” mode by pressing RANGE.
Submerse the ORP electrode 3 cm (1¼”) into the sample to be tested
and wait for the reading to stabilize.
Measurements within the ±699.9 mV range are displayed with 0.1 mV
resolution, while outside this range the resolution is 1 mV.
The ATC (or MTC) key is turned off because the mV readings are not
temperature compensated.
For accurate ORP measurements, the surface of the electrode must be
clean and smooth. Pretreatment solutions are available to condition
the electrode and improve the response time (see “Accessories“ section).
Notes
:
• When the reading is out of range, the display will flash the closest
full-scale value.
• If using a pH electrode while in mV mode, the meter will measure
the mV generated by the pH electrode.
Note
: While in MEM mode, the user can switch between pH and mV
by pressing the RANGE key.
A stored value can be recalled by pressing MR: the display will show
the memorized reading and the “RECALL MEMORIZED” tag, as
long as the MR key is pressed.
Note
: MR will only display the range that was active when MEM was
pressed.
BACKLIGHT FEATURE
The meter is provided with a Backlight feature,
which can be easily accessed through the LIGHT
key.
Note
: The backlight automatically shuts off after approximately 1 minute
of nonuse.