USER MANUAL
PORTABLE
pH/EC/TDS/Temperature Meter
MODEL: SM806
Combined Meter
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 in- stall the battery while pay- ing attention to its polarity.
• Connect the MA851D/1 probe to the meter.
• Turn the instrument on by pressing the ON/OFF key. At
•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 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 mea- sured value will be fro- zen on the display and the “HOLD” message ap- pears 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 stor- age 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 reactivate 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 beaker for rinsing the probe, the other for calibration. In this way the cross contamina- tion between solutions is minimized.
B) Procedure:
•Enter the pH mode with the “RANGE” 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.
•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 displayed.
Note: We reserve the right to modify design, construction and appearance of our products with- out advance notice.
•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 automatically recognize the buffer value, store the calibration point and return to normal mode.
•If using pH 7.01 (or pH 6.86), after recog-
