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Notes:
• Before taking any measurements make sure the
meter has been calibrated (CAL tag present on the
LCD).
• If measurements are taken in different samples
successively, rinse the probe thoroughly to eliminate
cross-contamination; and after cleaning, rinse the
probe with some of the sample to be measured.
For better accuracy, frequent calibration of the instru-
ment is recommended. In addition, the instrument
must be recalibrated whenever:
a) The pH electrode is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.
Calibration procedure
From normal measuring mode, press and hold the
/MODE button until OFF on the secondary LCD is
replaced by CAL. Release the button. The LCD enters
the calibration mode displaying “pH 7.01 USE” (or
“pH 6.86 USE” if the NIST buffer set was selected).
After 1 second the meter activates the automatic buffer
recognition feature. If a valid buffer is detected then its
value is shown on the primary display and REC
appears on the secondary LCD. If no valid buffer is
detected, the meter keeps the USE indication active for
12 seconds, and then it replaces it with WRNG,
indicating the sample being measured is not a valid
buffer.
• For a
single-point calibration with buffers pH 4.01,
9.18 or 10.01, the meter automatically accepts the
calibration when the reading is stable; the meter
displays the accepted buffer, with the message “OK
1”. After 1 second the meter automatically returns to
the normal measuring mode.
If a single-point calibration with buffer pH 7.01 (or
pH 6.86) is desired, then after the calibration point
has been accepted the
/MODE button must be
pressed in order to return to normal mode. After the
button is pressed, the meter shows “7.01” (or “6.86”)
- “OK 1” and, after 1 second, it automatically returns
to the normal measuring mode.
Note: It is always recommended to carry out a two-
point calibration for better accuracy.
• For a
two-point calibration, place the electrode in
pH 7.01 (or pH 6.86) buffer. After the first calibration
point has been accepted, the “pH 4.01 USE” message
appears. The message is held for 12 seconds, unless a
valid buffer is recognized. If no valid buffer is recog-
nized, then the WRNG message is shown. If a valid
buffer (pH 4.01, pH 10.01, or pH 9.18) is detected,
then the meter completes the calibration procedure.
When the buffer is accepted, the LCD shows the
accepted value with the “OK 2” message, and then
the meter returns to the normal measuring mode.
Note: When the calibration procedure is completed,
the CAL tag is turned on.
To quit calibration and to reset to the default
values
• After entering the calibration mode and before the
first point is accepted, it is possible to quit the
procedure and return to the last calibration data by
pressing the
/MODE button. The secondary LCD
displays “ESC” for 1 second and the meter returns to
the normal measuring mode.
• To reset to the default values and clear a previous
calibration, press the SET/HOLD button after entering
the calibration mode and before the first point is
accepted. The secondary LCD displays “CLR” for 1
second, the meter resets to the default calibration and
the CAL tag on the LCD disappears.
CALIBRATION
BATTERY REPLACEMENT
The meter displays the remaining battery percentage
every time it is switched on. When the battery level is
below 5%, the
- +
symbol on the bottom left of the LCD
lights up to indicate a low battery condition. The batter-
ies should be replaced soon. If the battery level is low
enough to cause erroneous readings, the meter shows
“0%” and the Battery Error Prevention System (BEPS) will
automatically turn the meter off.
To change the batteries, remove the 4 screws located on
the top of the meter.
Once the top has been removed, carefully replace the 4
batteries located in the compartment while paying atten-
tion to their polarity.
Replace the top, making sure that the gasket is properly
seated in place, and tighten the screws to ensure a
watertight seal.
pH ELECTRODE MAINTENANCE
• The pH electrode can be easily replaced by using the
supplied tool (HI 73128). Insert the tool into the elec-
trode cavity as shown below.
Rotate the electrode counterclockwise.
Pull the electrode out by using the other side of the tool.
Insert a new pH electrode following the above instruc-
tions in reverse order.
• When not in use, rinse the electrode with water to
minimize contamination and store it with a few drops
of HI 70300 storage solution in the protective cap.
DO NOT USE DISTILLED OR DEIONIZED WATER
FOR STORAGE PURPOSES.
• If the electrode has been left dry, soak in storage
solution for at least one hour to reactivate it.
• To prolong the life of the pH electrode, it is
recommended to clean it monthly by immersing it in
the HI 7061 cleaning solution for half an hour.
Afterwards, rinse it thoroughly with tap water and
recalibrate the meter.
SPECIFICATIONS
Range
Resolution
Accuracy
(@20°C/68°F)
Typical
EMC Deviation
Temp. Compensation
Environment
Calibration
Electrode
Battery Type/Life
Auto-off
Dimensions
Weight
To turn the meter on and check the battery status
Press and hold the /MODE button until the LCD
lights up. All the used segments on the LCD will be
visible for 1 second (or as long as the button is
pressed), followed by the percent indication of the
remaining battery life (E.g. % 100 BATT).
Taking measurements
Submerge the electrode in the solution to be tested
while stirring it gently. The measurements should be
taken when the stability symbol on the top left of
the LCD disappears.
The pH value automatically com-
pensated for temperature is
shown on the primary LCD
while the secondary LCD shows
the temperature of the sample.
To freeze the display
While in measurement mode,
press the SET/HOLD button.
HOLD appears on the second-
ary display and the reading
will be frozen on the LCD (E.g.
pH 5.78 HOLD).
Press any button to return to normal mode.
To turn the meter off
While in normal mode, press the
/MODE button.
OFF will appear on the secondary display. Release
the button.
OPERATIONAL GUIDE
Setup mode allows the selection of temperature unit
and pH buffer set.
To enter the Setup mode, press the
/MODE button
until CAL on the secondary display is replaced by
TEMP and the current temperature unit (E.g. TEMP
°C). Then:
• for °C/°F selection: Use the SET/HOLD button.
After the temperature unit has been selected, press the
/MODE button to enter the buffer set selection
mode; press the
/MODE button twice to return to
the normal measuring mode.
•
to change the calibration buffer set: After setting
the temperature unit, the meter will show the current
buffer set: “pH 7.01 BUFF” (for 4.01/7.01/10.01) or
“pH 6.86 BUFF” (for NIST 4.01/6.86/9.18).
Change the set with the SET/HOLD button, then press
/MODE to return to normal measuring mode.
SETUP
-2.0 to 16.0 pH (HI 98127)
-2.00 to 16.00 pH (HI 98128)
-5.0 to 60.0°C / 23.0 to 140.0°F
0.1 pH (HI 98127)
0.01 pH (HI 98128)
0.1°C / 0.1°F
±0.1 pH (HI 98127)
±0.05 pH (HI 98128)
±0.5°C / ±1°F
±0.1 pH (HI 98127)
±0.02 pH (HI 98128)
±0.3°C / ±0.6°F
Automatic
-5 to 50°C (23 to 122°F); RH 100%
1 or 2 points with 2 sets of memorized
buffers (pH 4.01/7.01/10.01 or
4.01/6.86/9.18)
HI 73127 pH electrode (included)
4 x 1.5V with BEPS/typical 300 hours
After 8 minutes
163 x 40 x 26 mm (6.4 x 1.6 x 1.0”)
85 g (3.0 oz)
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