M ilw a u ke e
USER MANUAL
PORTABLE
MODEL: SM102
Smart pH Meter
WARRANTY:
This instrument is warranted from all defects in materials and manufacturing for a period of two years from the date of purchase.
The probe is warranted for a period of six months. If during this period the repair or replacement of parts is required, where the damage is not due to negligence or erroneous operation by the user, please return the parts to either distributor or our office and the repair will be effected free of change.
Note: We reserve the right to modify the design, construction and appearance of our products without advance notice.
M ilw a u ke e
OPERATION:
•The meter is supplied complete with a 9V battery. Slide off the battery compart- ment cover on the back of the meter and install the battery while paying at- tention to its polarity.
•Always remove the electrode protective cap before taking any measurement. If the electrode has been left dry, soak the tip (bottom 2.5 cm) in rinse solution (M10000B) for a few minutes to reacti- vate it.
• Connect the pH electrode and the temperature probe
to the sockets on the meter’s top.
The temperature probe can be used independently to take temperature measurements, or
it can be used in conjunction with
the pH electrode to utilize the meter’s ATC capability.
•Turn the instrument on by pressing the ON/OFF key.
•Before taking any mea- surements, make sure that the meter has al- ready been calibrated.
•Immerse the tip (2.5 cm)
of the pH electrode and the temperature probe into the sample and stir gently.
•Take the pH reading when the hour- glass symbol stops blinking.
•To display the mea-
sured temperature, press and hold the
°C key.
When the key is released, the display will return to the pH reading.
•The HOLD function is activated by keeping pressed the HOLD key. The measured value is frozen on the display and the “HOLD” tag lights up.
• After measurements, switch the meter off and store the electrode with a few drops of storage solu- tion in the protective cap.
•Error message on display:
•Blinking full scale value: reading is over range;
•“Eb”: battery low voltage indication;
•“Ec”: wrong buffer solution;
•“Clr”: the calibration data have been lost and recalibration is needed.
CALIBRATION PROCEDURE:
A)Preparation: Reference solutions:
1.pH 7.01 (MA 9007)
2.pH 4.01 (MA 9004) for measuring in the acid range (pH lower than 7) or pH 10.01 (MA 9010) for measur- ing in the alkaline range (pH higher than 7).
Use two beakers for each reference so- lution. One beaker for rinsing the electrode, the other for calibration. This way contamination between solutions during calibration is minimized.
B) Procedure:
• Remove the electrode protective cap and rinse the tip with some pH7.01 solution, then immerse the electrode and the temperature probe into a pH7.01 buffer solution.
• Press the CAL key to enter the Cali- 
bration mode. The display flashes “pH 7.01” and the hourglass lights up.