Lovibond MicroDirect pH10 User 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.
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.
Note: The calibration mode allows you to perform up to three calibration points
before returning to the measurement mode automatically. However, if you opted to
have only one or two calibration points, simply skip the remaining calibration points
by exiting to the measurement mode by pressing the CAL button.
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.
GB
• Large Screen
• Waterproof
pH / Tempe-
rature Tester
• Double Junc-
tion
Instruction
manual
pH10

Electrode Maintenance
1. Rinse the electrode with tap water or electrode storage solution after each measurement.
Care has to be taken not to damage the sensor’s glass electrode.
2. In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins,
take readings quickly and rinse electrode immediately afterward.
3. If possible, keep a small piece of paper or sponge in the electrode cap – moistened with
clean water or electrode storage solution (NOT de-ionized water) – and close the cap over the
electrode.
Changing Batteries
1. Open battery compartment lid (with attached lanyard loop).
2. Remove old batteries; replace with fresh ones. Note polarity
Self-Diagnostic Messages
Electrode Replacement
You can replace the electrode module at the fraction of the cost of a new tester.
When the tester fails to calibrate or gives fluctuating readings in calibration standards, you need
to change the electrode.
1. With dry hands, grip the ribbed tester collar with electrode facing you. Twist the collar counter
clockwise (see picture A). Save the ribbed tester collar and O-ring for later use.
2. Pull the old electrode module away from the tester.
3. Align the four tabs on the new module so that they match the four slots on the tester (see
picture B).
4. Gently push the module onto the slots to sit it in position. Push the smaller O-ring fully onto
the new electrode module. Push the collar over the module and thread it into place by firmly
twisting clockwise.
Note: It is necessary that you recalibrate your tester prior to measurement after an electrode
replacement.
Warranty
The waterproof MicroDirect pH10 is warranted to be free from manufacturing defects for
2 years and electrode module for 6 months. If repair, adjustment or replacement is necessary
and has not been the result of abuse or misuse within the time period, please return the tester
– freight prepaid – and correction will be made without charge. Out of warranty products will
be repaired on a charge basis.
Return of Items
Authorization must be obtained from your distributor before returning items for any reason.
When applying for authorization, please include information regarding the reason the item(s)
are to be returned.
Note: We reserve the right to make improvements in design, construction and appearance of
products without notice. Prices are subject to change without notice.
Accessories
19 46 36 Replacement sensor MicroDirect pH10
51 56 10 100 Buffertablets pH 7
51 56 20 100 Buffertablets pH 4
51 56 00 100 Buffertablets pH 10
45 70 22 250 ml Deionised water
38 48 01 100 ml Plastic beaker
33 23 09 Replacement battery
pH-Buffer
Buffer solutions produced with tablets are colour coded for easy identification. The colour
coding is as follow:
pH 4 tablet = Red solution
pH 7 tablet = Yellow solution
pH 10 tablet = Green solution
Procedure
1. FilI a clean beaker with 20 ml deionised/distilled water.
2. Add one buffer tablet of the required value and shake or crush with a clean stirring rod until
the tablet disintegrates.
3. Allow to stand for about two minutes to en-sure that the buffer is completely dissolved and
to allow any insoluble particles to settle.
4. Check that the colour of the solution corresponds to the buffer value required.
5. Immerse the electrode into the tube and calibrate the MicroDirect pH10 in accordance with
this instruction manual.
6. Remove the electrode and rinse it thoroughly in deionised/distilled water.
Note
It is important to rinse the electrode before immerse in a buffer solution of a different value.
Accuracy
Fresh buffer solutions should always be made up in deionised/distilled water.
The maximum tolerance based on the pH values 4, 7 and 10 is ±0.05 pH
Technical Specifications pH10
Range -1.00 .....15.00 pH
Resolution 0.1 pH
Accuracy 0.1 pH
Calibration Points 1-, 2-, 3-point
Buffer Solutions USA 4.0/7.0/10.0
NIST 4.0/6.9/9.2
Calibration Window (USA Buffer Set Standard) +/-1.0 pH (pH 4.0 & pH 10.0),
+/-1.5 pH (pH 7.0)
Calibration Window (NIST Buffer Set Standard) +/-1.0 pH (pH 4.0 & pH 9.1)
+/-1.2 pH (pH 6.9)
Automatic Temperature Compensation (ATC) Yes
Auto Off 8.5 minutes
Batteries 4 x 1.5V “A 76 ” Micro Alkalie Batteries
Battery Life > 500 hours
Operation Temperature 0 – 50 °C
Dimensions (Tester) 165 x 38 mm
Weight 0,090 kg