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PRELIMINARY EXAMINATION
Remove the instrument from the packing material and
examine it carefully to make sure that no damage has
occurred during shipment. If noticeable damage is found,
notify your Dealer.
Each meter is supplied complete with:
SE-600 preamplified non refillable double junction
combination pH electrode with built in EC/TDS probe and
temperature sensor; 1m (3.3') cable.
pH7.01, 1413 S/cm & 1382 ppm (for MW801) or 1500 ppm
(for MW802) solutions, 20 mL each.
Instruction Manual.
1 x 9V battery.
OPERATION
Slide the battery compartment cover located on the back
of the meter off, and install the battery into the battery clip
connector while observing polarity.
Connect the probe to the meter securely by aligning the pins
with the socket and pushing the plug in.
DIN Connector
Always remove the electrode protective cap before use.
Make sure that the meter has been calibrated before taking
any measurements (see calibration procedure).
Turn the instrument on by pressing the ON/OFF key.
pH MEASUREMENTS
If the electrode has been left dry, soak the tip in a pH7
(M10007) buffer solution for a few minutes to reactivate it.
Submerge the tip of the electrode into the sample to be
measured, select the pH mode and allow the reading to
stabilize before taking measurements.
EC/TDS MEASUREMENTS
Immerse the tip of the electrode into the sample to be tested.
Select the measurement range (EC or TDS) and wait for the
temperature sensor to reach thermal equilibrium with the
samples before taking measurements.
AFTER MEASUREMENTS the instrument should be switched
off and the probe cleaned and stored with a few drops of
storage solution in the protective cap.
CALIBRATION PROCEDURE:
Remove the protective cap from the electrode.
Switch the meter on.
Select the range pressing the appropriate key for pH, EC or
TDS.
pH Calibration
A. PREPARATION
Single point manual calibration. Choose buffer.
If you are going to measure samples near pH 7 use pH 7.01
buffer solution (M10007B) for calibration; use pH 4.01 buffer
solution (M10004B) for acidic measurements, or pH 10.01
(M10010B) for alkaline measurements.
B. PROCEDURE
Rinse the tip of the electrode and immerse it in the
calibration solution. Wait a couple of minutes for the reading
to stabilize.
Measure the temperature of the buffer solution with a
thermometer.
Adjust the calibration knob until the LCD shows the pH value
of the buffer at the measured temperature (see pH versus
temperature chart).
pH Calibration
The calibration is now complete and the meter is
ready for use.
EC/TDS calibration:
A. PREPARATION
Single point EC calibration.
Choose appropriate standard:
Model MW801: use 1382 ppm (M10032B) for TDS or 1.413 S/
cm (M10031B) for EC calibration.
Model MW802: use 1500 ppm (M10442B) for TDS or 1.413
mS/cm (M10031B) for EC calibration.
B. PROCEDURE
Immerse the tip of the electrode in the standard
solution.
Wait for the reading to stabilize, and thermal equilibrium be
reached.
Turn the EC/TDS calibration knob until the display shows the
EC or TDS reading at 25°C.
EC/TDS Calibration
The calibration is now complete and the meter is ready for
use.
The instrument should be re-calibrated at least once a
month, or when the probe or battery is replaced.
Note: The conversion between EC and TDS is made by a
built-in circuit. If calibration is made in EC range, TDS range
is automatically calibrated (or vice versa).
BATTERY REPLACEMENT:
The meters are powered by a 9V battery that is in a
compartment located in the rear of the instrument.
When the battery becomes weak, the instrument
automatically switches off.
Replacement must only take place in a non-hazardous
area using an alkaline 9V battery. Slide off the battery
compartment cover and replace the old battery with a new
one. Make sure that the battery contacts are fully engaged
in the connector. Seat the battery in is compartment and
replace the cover.
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