User Manual

GENERAL OPERATION
• The meter is supplied com-
plete with a 9V battery. Re-
move the battery cover on the
back of the meter and install
the battery while paying atten-
tion to its polarity.
• Connect the MA851D/1 probe
to the meter and turn it on by
pressing the ON/OFF key.
• At start-up, the LCD shows
the percentage of the remain-
ing battery life for a few sec-
onds, and then the current
measurement.
• To select the temperature measurement unit (°C
or °F), 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, then press “ON/OFF” a
couple of times to return to normal mode.
• To activate the HOLD func-
tion, keep pressed the “HOLD”
key. The measured value will
be frozen on the display and
the “HOLD” message appears
on the secondary LCD.
• To set the measurement range (pH, µS, ppm),
press the “RANGE” key. The chosen mode will
be stored until next change.
• 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).
• After measurements, switch the meter off by
pressing the “ON/OFF” key. The “OFF” mes-
sage appears on the LCD; release the button.
• Store the electrode with a few drops of storage
solution in the protective cap.
TAKING pH MEASUREMENTS
• 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 solution for a few minutes to reac-
tivate it.
• Select the pH range with the “RANGE” key.
• Immerse the tip (2.5 cm) of the probe into the
sample and stir gently.
• Read the pH value when the clock symbol
stops blinking.
pH CALIBRATION PROCEDURE
A) Preparation, Buffer solutions:
1. pH 7.01 / 6.86 (MA9007 / MA9006)
2. pH 4.01 (MA9004) for acidic calibration (pH <
7) or pH 10.01 / 9.18 (MA9010 / MA9009) for
alkaline range (pH > 7).
Use two beakers for each buffer solution: one bea-
ker for rinsing the probe, the other for calibration. In
this way the cross contamination between solutions
is minimized.
B) Procedure:
• Enter the pH mode with the “RANGE” key.
Select 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
USER MANUAL
MI 805
pH/EC/TDS/Temperature
Portable Meter
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 “ON/OFF” again to exit.
• Remove the protective cap, then immerse the
probe in the first buffer solution.
• Press and hold the “ON/OFF”
key until “CAL” is displayed on
the lower LCD. Release the but-
ton and the message “7.01 pH
USE” (or “6.86 pH USE” for
NIST buffer set) will be displayed.
• For a single point pH calibration, place the probe
in any buffer from the selected set (e.g. pH 4.01
or 7.01/6.86 or 10.01/9.18). The meter will auto-
matically recognize the buffer value, store the
calibration point and return to normal mode.
• If using pH 7.01 (or pH 6.86), after recognition of
the buffer press the “ON/OFF” button to return to
normal mode.
• For
a two point pH calibration, place the probe in
pH 7.01 buffer (or pH 6.86, if the NIST buffer set
was selected).
The meter will recognize the buffer
value and then display pH 4.01
USE.
• Place the probe in the second buffer (pH 4.01 or
10.01, or, if using NIST, pH 4.01 or 9.18).
When the second buffer is recognized, the LCD
will display “OK” for 1 second and the meter
will return to normal mode.
• The “CAL” tag is displayed on the LCD to
indicate that the meter is calibrated.
ISTMI805R1 06/04