Hanna Instruments HI 2210 - Manual (Page 5)

8 9
TEMPERATURE MEASUREMENTS TEMPERATURE MEASUREMENTS TEMPERATURE MEASUREMENTS TEMPERATURE MEASUREMENTS TEMPERATURE MEASUREMENTS
Connect the HI 7662 temperature probe to the TEMP
socket and turn the instrument on.
Immerse the temperature probe into the sample and
allow the reading on the secondary LCD to stabilize.
MEMORY FUNCTION
MEMORY FUNCTION MEMORY FUNCTION MEMORY FUNCTION MEMORY FUNCTION
Press and hold down MEM. The last reading will appear on the LCD
along with “MEM” tag until MEM is released.
Press MR and the previously memorized reading will be displayed
with “MEM” tag on the LCD.
C
If measurements are taken successively in different samples, it is
recommended to rinse the electrode thoroughly with deionized water
or tap water and then with some of the next sample in order to
prevent cross-contamination.
The pH reading is affected by temperature. In order to measure the
pH accurately, the temperature effect must be compensated for.
To use the Automatic Temperature Compensation feature, connect
and submerge the HI 7662 temperature probe into the sample as
close as possible to the electrode and wait for a few seconds.
If the temperature of the sample is known, manual temperature
compensation can be performed by disconnecting the temperature probe.
The display will then show the default temperature
of 25 °C or the last recorded temperature reading
with the “°C” tag blinking. The temperature can now
be adjusted with the ARROW keys (from -9.9 °C to
120.0 °C).
ORP MEASUREMENTS (H ORP MEASUREMENTS (H ORP MEASUREMENTS (H ORP MEASUREMENTS (H ORP MEASUREMENTS (HIIIII 2 2 2 2 22222211 11 11 11 11 only only only only only)))))
An optional ORP electrode must be used to perform ORP measurements
(see Accessories).
Oxidation-reduction potential (REDOX) measurements provide the
quantification of the oxidizing or reducing power of the tested sample.
To correctly perform a redox measurement, the surface
of the ORP electrode must be clean and smooth.
• Press RANGE to enter mV range.
• Submerge the tip of the ORP electrode 4 cm
(1½") into the sample to be tested and allow a
few seconds for the reading to stabilize.
• The instrument displays the mV reading on the primary LCD and
the temperature on the secondary LCD.
• If the reading is out of range, “----” will be displayed on the
LCD.
mV C