Automatic temperature
compensation indicator
Instability
indicator
Calibration
indicator
Low battery
indicator
Measuring
unit
Main
LCD
Secondary
LCD
Temperature
Unit
OPERATIONAL GUIDE
y
Remove the electrode cap and immerse the
tester in MA9015 storage solution for 2 hours to
activate the electrode.
y
Turn the tester on by pressing the ON/OFF
button. All the used segments on the LCD will
be visible for 1 second or as long as the button
is pressed.
y
Immerse the electrode in the solution to be
tested. Stir gently and wait for the reading to
stabilize, i.e. the instability indicator (hourglass)
on the LCD turns off.
y
The pH value is automatically compensated for
temperature and will be displayed on the main
LCD, while the temperature is shown on the
secondary LCD.
y
To freeze the display
, while in measurement
mode, press and hold the SET/HOLD button.
The “HOLD” message appears on the secondary
display and the reading will be frozen on the
LCD.
Press any button to return to normal mode.
y
To turn the tester off
, press the ON/OFF
button. The “OFF” message will appear on the
secondary display. Release the button.
Note:
y
Before taking any measurement, make sure the
tester is calibrated (the CAL tag is on).
y
After use always turn the tester OFF, rinse the
electrode with water to minimize contamination
and store it with a few drops of storage (MA9015)
or pH7 (M10007) solution in the protective cap.
NEVER USE DISTILLED OR DEIONIZED WATER FOR
STORAGE PURPOSE.
CALIBRATION PROCEDURE
For better accuracy, frequent calibration of
the tester is recommended. Calibration is also
necessary after electrode replacement, after
testing aggressive chemicals and where extreme
accuracy is required.
y
From normal operation mode, press and hold
the ON/OFF/CAL button until the “OFF” message
on the secondary LCD is substituted by “CAL”.
Release the button.
y
The instrument enters the calibration mode by
displaying “pH 7.01 USE” (or “pH 6.86 USE” if the
NIST buffer set was selected).
y
For a
single-point calibration
, immerse the
electrode in any buffer, i.e. pH 4.01, 7.01 (or 6.86),
10.01 (or 9.18).
y
The tester activates the automatic buffer
recognition. If no valid buffer is detected, the
tester keeps the USE indication active for 12
seconds, and then replaces it with WRNG,
indicating that the sample being measured is
not a valid buffer. Otherwise, if a valid buffer is
detected, then its value is shown on the primary
display, and REC appears on the secondary LCD.
y
If the pH 7.01 (or pH 6.86) was used, press the
SET button to exit the Calibration mode and the
“OK 1” message will appear on the display. The
first calibration point is stored and the tester
returns to normal measurement mode.
For better accuracy, it is always recommended
to perform a 2-point calibration.
y
For a
two-point calibration
, immerse the
electrode in pH 7.01 (or pH 6.86) buffer solution.
y
After the first point has been accepted, the
tester will then ask for the second buffer and
the message “pH 4.01 USE” will appear.
y
Rinse the electrode and immerse it in the
second solution (pH 4.01, 10.01 or 9.18).
y
If a valid buffer value is detected, the REC
message is displayed and the tester completes
the calibration procedure. The LCD shows the
accepted value with the “OK 2” message and the
instrument returns to the normal measurement
mode. Otherwise, if no valid buffer is detected,
the tester displays the WRNG message.
Note: When the calibration procedure is
completed, the CAL tag is turned on.
y
To quit the procedure
and return to the last
calibration data, after entering the calibration
mode press the ON/OFF button. The secondary
LCD displays “ESC” for 1 second and then the
tester returns to the normal measurement
mode.
y
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 tester resets to
the default calibration and the CAL tag on the
LCD turns off.
SETUP
Setup mode allows the selection of temperature
(°C or °F) and pH buffer set for calibration.
To enter the Setup mode, press the ON/OFF
button until “CAL” on the secondary LCD is
replaced by “TEMP” and the current temperature
unit (e.g. TEMP °C). Then:
y
for °C/°F selection:
use the SET/HOLD button;
then press the ON/OFF button once to enter
the buffer set selection or twice to return to the
normal measurement mode.
y
to change the calibration buffer set:
after
setting the temperature unit, press ON/OFF
once and select the buffer set (“pH 7.01 BUFF” or
“pH 6.86 BUFF” for NIST) by using the SET/HOLD
button. Press ON/OFF to return to the normal
measurement mode.
ELECTRODE REPLACEMENT
y
Remove the protective cap and unscrew the
plastic ring on the top of the electrode.
y
Pull out the MI56P electrode and replace it with
a new one.
y
Make sure the gaskets are in place before
screwing back the ring.
BATTERY REPLACEMENT
When the batteries become weak, the battery
symbol on the LCD will light up to advise that only a
few hours of working time is remaining.
The tester is also provided with BEPS (Battery Error
Prevention System), which avoids any erroneous
readings due to low battery level by automatically
switching the tester off.
It is recommended to replace the batteries
immediately.
