OPERATIONAL GUIDE
The meter is supplied complete with a 9V battery. Remove the
battery compartment cover on the back of the meter, install the
battery while paying attention to its polarity.
Always remove the electrode protective cap before taking any
measurements. If the electrode has been left dry, soak the tip in
HI
70300
storage solution for half an hour to reactivate it.
Connect the pH electrode and the temperature probe to the proper
connectors on the top of the instrument.
Turn the meter ON by pressing the ON/OFF key.
To take pH measurements
simply submerge the pH electrode
(at least 4cm/1½") and the temperature probe
(as close as possible to the electrode) into the
sample to be tested.
The temperature probe can be used inde-
pendently to take temperature measurements,
or it can be used in conjunction with the pH
electrode to utilize the meter's ATC capability.
Select the pH mode. Shake briefly and wait a
couple of minutes for the reading to stabilize.
The display will show the pH value automati-
cally compensated for temperature variations.
In order to take accurate pH measurements, make sure that the
instrument has been calibrated for pH before use.
If measurements are taken in different samples successively, it is
recommended to rinse the electrode thoroughly to avoid cross-
contamination. After cleaning, rinse the electrode with some of the
sample to be measured.
To take temperature measurements
make sure the temperature probe is connected
to the meter, immerse it in the sample to be
measured and press the °C key to enter the
temperature mode.
Note:
If the temperature probe is not connected, the pH reading
will be compensated at 25°C.
To take ORP (mV) measurements
connect an ORP electrode
(optional) to the BNC connector on the top of the meter, submerge
the tip (at least 4 cm/1½") into the solution,
enter the "mV" mode by pressing the mV key
and wait a few minutes for the reading to
stabilize.
The ORP (mV) and temperature ranges are factory cali-
brated. Contact the nearest Hanna Service Center for
recalibration, if needed.
For greatest accuracy, a frequent
pH calibration
is recom-
mended. The instrument should be recalibrated for pH whenever
the pH electrode is replaced, where extreme accuracy is required,
and at least once a month.
• Pour small quantities of pH7.01 (
HI 5007
) and pH3.00
(
HI 5003
) buffer solutions into two clean beakers.
For an accurate calibration use two beakers for each buffer
solution, the first one for rinsing the tip of the electrode, the
second one for calibration. If a calibration with NBS stan-
dards is needed, use pH6.86 (
HI 5068
) instead of pH7.01.
• Connect pH electrode and temperature probe to the meter
and switch it ON.
• Remove the protective cap, rinse the tips of pH electrode and
temperature probe with some pH7.01 solution. Immerse
them into pH7.01 buffer solution, stir gently and wait a
couple of minutes for stable reading.
Note:
The electrode should be submerged approximately 4 cm
(1½") into the solution and the temperature probe should
be located as close as possible to the electrode.
• Press the °C key to display the temperature of the buffer
(e.g. 20°C). Then press the pH key to read pH values. Stir
gently and wait for a couple of minutes.
• Adjust the OFFSET trim-
mer on the lower left of
the front panel until LCD
shows the pH value at
the noted temperature.
•
Rinse and immerse the pH electrode in pH3.00 buffer
solution (2
nd
calibration point) and stir gently.
• Wait a couple of minutes
and adjust the SLOPE trim-
mer on the lower right of
the front panel until the
LCD shows the pH value
at the noted temperature.
The pH calibration is now complete.
CALIBRATION
BATTERY REPLACEMENT
When the battery becomes weak, the meter
displays a blinking additional decimal point
on the left side of the LCD.
When the low battery indicator appears only a few hours of
battery life is remaining. A low battery level may also result in
unreliable measurements. It is recommended to replace the
battery immediately. Replacement must only take place in a safe
area and using an alkaline 9V battery.
Unscrew the 3 screws on the back of the meter, remove the
battery cover and replace the battery while paying attention to
its polarity.
TEMP pH VALUES
°C 3.00 7.01 6.86
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
3.07
3.05
3.03
3.02
3.00
3.00
3.00
3.00
2.99
2.99
2.99
2.99
2.99
2.99
3.00
7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98
6.99
6.99
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83
6.84
6.84
6.85
6.85
pH VALUES AT
VARIOUS TEMPERATURES
ºC
pH ELECTRODE MAINTENANCE
Preparation
Remove the electrode protective cap. Do not be alarmed if any
salt deposits are present: this is normal with electrodes and they
will disappear when rinsed with water.
During transport tiny bubbles of air may have formed inside the
glass bulb. The electrode cannot function properly under these
conditions. These bubbles can be removed by "shaking down" the
electrode as you would do with a glass thermometer.
Sensitive bulb
To avoid clogging problems and ensure a fast response, the bulb
must be kept moist at any time. Store the electrode with few
drops of
HI 70300
storage solution in the protective cap. NEVER
USE DISTILLED OR DEIONIZED WATER FOR STORING PURPOSES.
Periodic maintenance
Inspect electrode and cable. The cable used for the connection to
the meter must be intact and there must be no points of broken
insulation. The connector must be perfectly clean and dry. If any
scratches or cracks are present, replace the electrode.
Refilling the electrode
ALWAYS VERIFY THE ELECTROLYTE LEVEL.
If the electrolyte level is more than 2 cm below the refilling hole,
unscrew and remove the refilling hole cap.
Add the 3.5M KCl electrolyte solu-
tion (
HI 7082
) by using the
supplied syringe. Tighten back the
cap. Wait at least 1 hour before
using the electrode.
Cleaning procedure
After use, clean the electrode by immersing it in the proper
cleaning solution (
HI 700635
or
HI 700636
) for 5 minutes.
If case of slow and unreliable readings, it is recommended to
perform the following procedure for cleaning the junction:
1. Shift upwards the PTFE collar. If the collar does not shift
easily, immerse it into warm water.
2. Wipe gently the electrode surface with a soft and clean tissue.
3. In case of persistent wine or must residual, wet the tissue with
cleaning solution (
HI 700635
or
HI 700636
).
4. Put back the collar in its original position.
