GENERAL OPERATION:
•
The meter is supplied com-
plete with a 9V battery.
Remove the battery com-
partment cover on the back
of the meter and install the
battery while paying atten-
tion to its polarity.
•
Connect the MA923D/1
probe to the meter.
•
Turn the instrument on by
pressing the ON/OFF key.
At start-up, the LCD shows
the percentage of the re-
maining battery life for a
few seconds, and then the
current measurement.
•
Always remove the electrode protective cap
before taking any measurement. If the elec-
trode has been left dry, soak the tip (bottom
2.5 cm) in M10000 rinse solution for a few
minutes to reactivate it.
•
The temperature reading can be displayed in
°C or °F unit; to select the desired scale,
press and hold the “ON/OFF” key until “TEMP”
and the current temperature unit are dis-
played on the secondary LCD. Use the “SET”
button to select the unit and then press the
“ON/OFF” key a couple of times to return to
normal mode.
•
To activate the HOLD function, keep pressed
the “HOLD” key. The measured value will be
frozen on the display and the “HOLD” mes-
sage appear on the secondary LCD.
•
After measurements, switch the meter off
by pressing the “ON/OFF” key. The “OFF”
message appears on the LCD; release the
button.
•
After use, replace the electrode protective
cap with a few drops of storage solution.
TAKING pH MEASUREMENTS:
•
Select the “pH” mode with the “SET ” key.
•
Immerse the tip (2.5 cm) of the probe in the
sample and stir gently.
•
Read the pH value when the clock sym-
bol stops blinking.
Note: Before taking any measurement, make
sure that the meter has been calibrated
(the “CAL” tag is displayed on the left
lower corner of the LCD).
pH CALIBRATION PROCEDURE:
It is recommended to recalibrate the meter at
least once every three weeks.
A) Preparation:
Buffer solutions:
1. pH 7.01 / 6.86 (MA9007 / MA9006)
2. pH 4.01 (MA9004) for acidic calibra-
tion (pH < 7) or pH 10.01 / 9.18
(MA9010 / MA9009) for alkaline range
(pH > 7).
Use two beakers for each buffer solu-
tion: one beaker for rinsing the probe,
the other for calibration. In this way the
cross contamination between solutions
is minimized.
B) Procedure:
•
Select the “pH” mode with the “SET ” key.
•
Select the calibration buffer set: press
and hold the “ON/OFF” key until the LCD
shows “TEMP”. Press again this key and
the “BUFF” message will appear; then
select the desired buffer set with the
“SET” key: “7.01 pH BUFF” (for standard
solutions: pH 4.01, 7.01, 10.01) or “6.86
pH BUFF” (for NIST solutions: pH 4.01,
6.86, 9.18). Press the “ON/OFF” key again
to exit.
•
Remove the protective cap, then immerse
the probe in the first buffer solution (7.01
or 6.86 pH).
•
Press and hold the “ON/OFF” key until
“CAL” is displayed on the lower LCD.
Release the button and the
message “7.01 pH USE”
(or “6.86 pH USE” for NIST
buffer set) will be dis-
played.
USER MANUAL
PORTABLE pH/ORP METER
WITH EXTENDED RANGE
MODEL: SM106
pH, ORP, Temperature Meter
