CE DECLARATION OF CONFORMITY
ACCESSORIES
HI 1286
Double junction, plastic body pH electrode
with 2 m (6.6’) cable and BNC connector
HI 1283*
Stainless steel grounding probe with 2 m
(6.6’) cable
HI 70004P
pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70007P
pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70031P
1.41 EC (mS) solution, 20 mL sachet (25 pcs)
HI 70442P
1500 ppm solution, 20 mL sachet (25 pcs)
HI 7004M
pH 4.01 solution, 230 mL bottle
HI 7007M
pH 7.01 solution, 230 mL bottle
HI 7031M
1.41 EC (mS/cm) solution, 230 mL bottle
HI 70442M
1500 ppm solution, 230 mL bottle
HI 7061M
Electrode cleaning solution, 230 mL bottle
HI 710005
12 VDC power adapter, US plug
HI 710006
12 VDC power adapter, European plug
HI 710012
12 VDC power adapter, Australian plug
HI 710013
12 VDC power adapter, Southern Africa plug
HI 710014
12 VDC power adapter, UK plug
*
To be replaced only by authorized service technicians
ISCOMBON 10/01
OPERATIONAL GUIDE
pH ELECTRODE CONNECTION
In order to protect the instrument against vapors and humid-
ity, the BNC connector is shielded behind a waterproof sheath.
• Slide the protective sheath down. Connect the pH elec-
trode to the BNC connector and then slide the protective
sheath back up all the way up to the casing. For
maximum waterproof protection, make sure the connector
is completely covered.
• Do not be alarmed if white crystals appear around the
electrode protective cap. This is normal with pH electrodes
and they dissolve when rinsed with water.
TAKING MEASUREMENTS
• Turn the meter on by connecting the 12 VDC power
adapter to the meter and the mains.
• Remove the protective cap from the pH electrode.
• Immerse the tips (4cm/1½”)
of pH electrode, EC/TDS probe
and grounding probe inside
the sample. In order to ensure
better accuracy of measure-
ments, probes should not touch
or stand close to the vessel’s
walls or bottom.
• The two LCDs will show the pH
and EC (or TDS) values. Any
initial variation in readings may
be due to the pH electrode
conditioning and EC/TDS tem-
perature compensation. Allow
the readings to stabilize.
pH ELECTRODE MAINTENANCE
• When not in use, rinse the electrode with water to minimize
contamination and store it with a few drops of storage
(
HI 70300
) or pH7 (
HI 7007
) solution in the protective cap.
Always replace the protective cap when not in use.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR STOR-
AGE PURPOSES.
• If the electrode has been left dry, soak the tip in a storage
(
HI 70300
) or pH7 (
HI 7007
) solution overnight to reacti-
vate it.
• To minimize clogging and provide longer life for the pH
electrode, it is recommended to clean it at least once a
month. Immerse the tip of the electrode in
HI 7061
cleaning solution for half an hour and then rinse it with
tap water.
EC/TDS PROBE MAINTENANCE
The following cleaning procedure is recommended at least once
a month:
• Immerse the tip of the electrode in
HI 7061
Cleaning
Solution for half an hour.
• If a more thorough cleaning is required, brush the metal
pins with very fine sandpaper.
• After cleaning, rinse the probe with tap water.
The instrument must be recalibrated whenever:
a) After cleaning or replacing the probe.
b) Where high accuracy is required.
c) At least once a month
pH CALIBRATION
Pour small quantities of pH 7.0 (
HI 7007
) and pH 4.0
(
HI 7004
) solution into two clean beakers.
For accurate calibration use two beakers for each buffer solution,
the first one for rinsing the tip of the electrode and the second
one for calibration.
• Turn the meter on.
• Remove the protective cap from the electrode, rinse and
immerse it in a pH 7.0 buffer solution. Stir gently and
wait for the reading to stabilize.
CALIBRATION
EC/TDS CALIBRATION
• Turn the meter on.
• Pour a small quantity of the proper calibration solution in
a beaker (
HI 70031
for
HI 981405N
and
HI 70442
for
HI
981404N
). If possible, use plastic beakers to minimize any
EMC interference.
• Immerse the EC/TDS probe in the solution, making sure
that the metal pins are completely submerged.
Note:
in order not to affect the accuracy of measurements, it
is important that probe body does not touch nor stand
close to the side walls of the beaker.
• Wait for a couple of minutes for thermal equilibrium to be
reached and the temperature to be compensated.
• Tap the probe gently on the bottom, then shake it while
rotating to make sure no air bubbles have remained
trapped.
• Adjust the calibration trimmer with a screwdriver until the display
shows 1.41 mS/cm (
HI 981405N
) or 1500 ppm (
HI 981404N
).
Calibration is now complete.
Note:
the electrode should be submerged approximately 4 cm
(1½”) in the solution.
• Adjust the right hand trimmer (
pH 7
) with the calibration
screwdriver until the LCD shows pH 7.0.
•
Rinse and immerse the pH electrode in pH 4.0 buffer and
stir gently.
• Wait a couple of minutes and then adjust the left hand
trimmer (
pH 4
) until the LCD shows the value of the second
buffer.
The pH calibration is now complete.
