OPERATIONAL GUIDE
•
Remove the probe cap and turn the meter on
by pressing the ON/OFF/CAL button. All the
used segments on the LCD will be visible for
1 second or as long as the button is pressed.
•
Immerse the probe in the solution to be tes-
ted and select either pH, EC or TDS mode
with SET/HOLD button.
•
Stir gently and wait for the reading to stabilize,
i.e. the stability indicator on the LCD turns off.
The pH and EC (or TDS) values are auto-
matically compensated for temperature and
will be displayed on the main LCD, while
the temperature is shown on the secondary
LCD.
• To freeze the display
, while in measurement
mode, press and hold the SET/HOLD but-
ton. The “HOLD” message appears on the
secondary display and the reading will be
frozen on the LCD.
•
Press any button to return to normal
mode.
• To turn the meter off
, press the ON/OFF/CAL
button. The “OFF” message will appear on
the secondary display. Release the button.
Notes:
•
Before taking any measurement, make sure
the meter is calibrated (the CAL tag is on).
•
After use always turn the meter OFF, rinse
the probe with water and store it with the pro-
tective cap.
Measuring unit
on main LCD
Main LCD
Temperature reading
Secondary LCD
Low battery indicator
Automatic temperature
compensation
Calibration indicator
Stability indicator
SETUP
Setup mode allows the selection of tempera-
ture (°C or °F), calibration buffer set, in pH
mode only,TDS conversion factor (CONV) and
temperature coefficient (BETA), in EC mode
only. To enter the Setup mode, press the ON/
OFF/CAL button until “CAL” on the secondary
LCD is replaced by “TEMP” and the current
temperature unit (e.g. TEMP °C). Then:
In EC and pH mode:
•
for °C/°F selection:
use the SET/ HOLD button, then press the ON/
OFF/CAL button to go in the settings menu and
to return to the normal measurement mode.
In EC mode only:
•
to change the TDS factor value:
after setting the temperature unit, press ON/
OFF/CAL button once to show the current val-
ue (e.g. 0.50 CONV). Select the desired value
by using the SET/HOLD button, then press ON/
OFF/CAL button twice to return to the normal
measurement mode.
•
to change the temperature coefficient:
after setting the TDS factor, press ON/OFF/
CAL button to show the current value of the
temperature coefficient ß (e.g. 2.1 BETA). Use
the SET/ HOLD button to set the desired value,
then press ON/OFF/CAL button to return to the
normal measurement mode.
In pH mode only:
• to change the calibration buffer set:
after setting the temperature unit, press ON/
OFF/CAL button once and select the buffer set
(“pH 7.01 BUFF” for pH 4.01/7.01/10.01 or “pH
6.86 BUFF” for NIST set 4.01/6.86/9.18) by
using the SET/HOLD button. Press ON/OFF/
CAL button to return to the normal measure-
ment mode.
EC MEASUREMENT AND CALIBRATION
PROCEDURE
Select the EC or TDS mode with the SET/
HOLD button.
Submerge the electrode in the solution to be
tested. The measurements should be taken
when the stability indicator
⌛
on the top left of
the LCD disappears.
•
For better accuracy, frequent calibration of
the tester is recommended. Calibration is
also necessary after probe replacement, after
testing aggressive chemicals and where ex-
treme accuracy is required. From normal EC
operation mode, press and hold the ON/OFF/
CAL button until the “OFF” message on the
secondary LCD is substituted by “CAL”. Re-
lease the button.
•
Immerse the probe in the proper calibration
solution: M10031 (1413 μS/cm) for MW803
and M10030 (12.88 mS/cm) for MW804.
•
Once the calibration has been automatically
performed, the LCD will show “OK” for 1 sec-
ond and the meter will return to normal mea-
surement mode.
•
Since there is a known relationship between
EC and TDS readings, it is not necessary to
calibrate the meter in TDS if it was previously
calibrated in EC mode.
pH MEASUREMENT AND CALIBRATION
Select the pH mode with the SET/HOLD
button. Submerge the electrode in the solution
to be tested. The measurements should be ta-
ken when the stability indicator
⌛
on the top left
of the LCD disappears.
For better accuracy, frequent calibration of the
tester is recomanded. Calibration is also ne-
cessary after electrode replacement, after tes-
ting aggressive chemicals and where extreme
accuracy is required.
•
From normal operation mode, press and hold
the ON/OFF/CAL button until the OFF message
on the secondary LCD is substituted by “CAL“.
Release the button.
•
The instrument enters the calibration mode
by displaying “pH 7.01 USE“ (or ‘‘pH 6.86
USE“ if the NIST buffer set was selected).
•
For a single-point calibration, immerse the
electrode in any buffer, i.e. pH 4.01, 7.01 (or
6.86), 10.01 (or 9.18).
•
The meter activates the automatic buffer
recognition. If no valid buffer is detected, the
meter keeps the USE indication active for 12
seconds, and then replaces it with WRNG in-
dicating that the sample being measured is
not a valid buffer. Otherwise, if a valid buffer
is detected, then its value is shown on the
main display, and REC appears on the se-
condary LCD.
•
If the pH 7.01 (or 6.86) was used, press the
SET button to exit the Calibration mode and
the “OK 1” message will appear on the dis-
play. The calibration point is stored and the
meter returns to normal measurement mode.
For better accuracy, it is always recommended
to perform a 2-point calibration.
•
For a 2-point calibration, immerse the elec-
trode in pH 7.01 (or 6.86) buffer solution.
•
After the first point has been accepted, the
meter will then ask for the second buffer and
the message “pH 4.01 USE” will appear.
•
Rinse the electrode and immerse it in the se-
cond solution (pH 4.01,10.01 or 9.18).
Notes:
•
When the calibration procedure is completed,
the CAL tag is turned on.
•
To quit the procedure and return to the last
calibration data, after entering the calibration
mode press the ON/OFF/CAL button.
