Lovibond MicroDirect pH10 Instruction Manual

Before you begin:

Condition your MicroDirect pH10 electrodes by immersing it in electrode storage solution or tap
water for at least 30 minutes before use. DO NOT use de-ionized water.
pH10

pH Buffer Set Selection

Your tester features USA (pH 4.01, pH 7.00 and pH 10.01) or
NIST (pH 4.01, pH 6.86, and pH 9.18) standards. Select either one to suit your requirements.
1. While pressing the HOLD/ENT button, switch on the tester by pressing the ON/OFF button.
2. Release the HOLD/ENT button. The display will flash either USA or nSt.
3. Press CAL button to toggle between the two buffer set standards.
4. Press the HOLD/ENT button to confirm the selection of the buffer set.

pH Calibration

Calibration should be done regularly, preferably once a week. You can calibrate up to three
points using either the USA or the nSt buffer set standards.
1. Press ON/OFF button to switch unit on.
2. Dip electrode about 2 to 3 cm into the pH standard buffer solution.
3. Press the CAL button to enter calibration mode. The 'CAL' indicator will be shown. The upper
display will show the measured reading based on the last calibration while the lower display will
indicate the pH standard buffer solution.
Note: The tester has dual display during calibration mode
Note: To abort calibration, press the 'CAL' button.
4. Allow about 2 minutes for the tester reading to stabilize before pressing the HOLD/ENT button
to confirm the first calibration point. The upper display will be calibrated to the pH standard
buffer solution and the lower display will then be toggling in between readings of the next pH
standard buffer solution.
5. Repeat with other buffers if necessary. Rinse electrode in tap water before dipping into next
buffer.
• Large Screen
• Waterproof
Note: The calibration mode allows you to perform up to three calibration points
pH / Tempe-
rature Tester
before returning to the measurement mode automatically. However, if you opted to
• Double Junc-
have only one or two calibration points, simply skip the remaining calibration points
tion
by exiting to the measurement mode by pressing the CAL button.
GB Instruction
manual

pH Measurement

1. Press the ON/OFF button to switch the tester on.
2. Dip the electrode about 2 to 3 cm into the test solution. Stir and let the reading stabilize.
3. Note the pH value or press HOLD/ENT button to freeze the reading. To release the reading,
press HOLD/ENT again.
4. Press ON/OFF to turn off tester. If you do not press a button for 8.5 minutes, the tester will
automatically shut off to conserve batteries.

HOLD Function

This feature lets you freeze the display for a delayed observation
1. Press HOLD/ENT button to freeze the measurement. A 'HOLD' indicator will be displayed and
the measurement will be frozen.
2. Press HOLD/ENT again to release the measurement. The 'HOLD' indicator will not be displayed
anymore indicating the held measurement is released.

User Reset

You can reset the pH calibration to the factory default by using the user reset function.
The buffer set selection is not affected by the user reset function.
1. Switch off the tester.
2. While pressing the 'CAL' button, press and release the ON/OFF button to enter the 'User
Reset' selection menu. The screen will display 'rSt' on the bottom display with a flashing 'nO'
selection.
3. Use the 'CAL' button to toggle between 'nO' and 'YES' selection.
• nO deactivates reset selection
• YES activates the reset selection
4. Press the HOLD/ENT button to confirm the selection made.
5. If you have selected 'YES', the unit will show 'CO' momentarily and proceed to the measure-
ment mode with the calibration reset back to factory default value.
6. If 'nO' is selected, the unit will proceed to the measurement mode without any calibration
reset performed.

Automatic Temperature Compensation (ATC)

Through its inbuilt temperature sensor, the measurement error due to the changes in electrode
sensitivity due to changes in temperature is compensated to give the actual pH reading of the
sample measured.