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
