GENERAL OPERATION:
•
After measurements, switch the meter
off by pressing the “ON/OFF” key. The
“OFF” message appears on the LCD;
release the button.
•
The meter is supplied
complete with a 9V bat-
tery. Remove the battery
compartment cover on
the back of the meter and
install the battery while
paying attention to its po-
larity.
Notes:
•
Before taking any measurement,
USER MANUAL
make sure that the meter has been
calibrated (the “CAL” tag is displayed
on the left lower corner of the LCD).
PORTABLE pH METER
WITH EXTENDED RANGE
•
•
Connect the MA914BR/1
probe to the meter.
•
Always replace the electrode protec-
tive cap after use with a few drops of
storage solution.
MODEL: SM105
Turn the instrument on
by pressing the ON/OFF
key. At start-up, the LCD
shows the percentage of
the remaining battery life
for a few seconds, and
then the current mea-
surement.
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 M10000 rinse so-
lution for a few minutes to reactivate it.
pH & Temperature Meter
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.
•
•
•
Immerse the tip (2.5 cm)
of the probe into the
sample and stir gently.
Read the pH value when
the clock symbol stops
B) Procedure:
•
blinking.
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 ap-
pear; 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 im-
merse the probe in the first buffer so-
lution (7.01 or 6.86 pH).
Press and hold the “ON/OFF” key until
“CAL” is displayed on the lower LCD.
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 displayed 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” message appear on the sec-
ondary LCD.
•
•
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