Hanna Instruments HI 981402 - Manual (Page 2)

• When not in use, rinse the electrode with water and store
it with a few drops of storage (HI 70300) or pH 7
(HI 7007) solution in the protective cap. Always replace
the protective cap after use.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR
STORAGE PURPOSES.
• If the electrode has been left dry, soak the tip in a
storage (HI 70300) or pH 7 (HI 7007) solution for at
least one hour to reactivate it.
• To minimize clogging and provide longer life for the pH
electrode, it is recommended to clean it monthly. Im-
merse the tip of the electrode in HI 7061 for one hour
and then rinse it with tap water.
TAKING pH MEASUREMENTS
• Turn the meter on by connecting
the 12 Vdc power adapter to the
meter and to the mains.
• Remove the protective cap from the
pH electrode and immerse the pH
electrode tip (4 cm/1½”) into the
sample.
• The LCD will show the pH value. Allow
the reading to stabilize and the instru-
ment will start continuous monitoring.
Note: To prevent damages to the pH
electrode, remove it from the sample
before turning the meter off.
ADJUSTING THE SETPOINT
With HI 981402 you can select the desired setpoint and be
alerted with a visual LED alarm when an abnormal situa-
tion arises.
• To access the MEASURE/SET switch and the setpoint
adjustment trimmer, remove the rear panel.
• Move the switch to the left (SET position).
• With a small screwdriver adjust the setpoint trimmer to
display the desired value in the range from 3 to 11 pH.
For the greatest accuracy, frequent calibration of the instru-
ment is recommended. In addition, the instrument must be
recalibrated whenever:
a) The pH electrode is replaced
b) After testing aggressive chemicals
c) Where extreme accuracy is required
d) At least once a month
PREPARATION
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.
For the second calibration point, the pH 4.0 (HI 7004)
buffer is recommended if you are going to measure acidic
samples, while pH 10.0 (HI 7010) should be used if
samples to be tested are alkaline.
CALIBRATION
• Moved back the switch to the MEASURE position.
• Close the meter with the rear panel, while making sure
the gasket is in place before tightening the screws.
• Whenever the pH reading varies
more than ±0.5 pH from the
setpoint, the red alarm LED blinks
to warn the user.
CALIBRATION PROCEDURE
• Turn the meter on and make sure that the MEASURE/SET
switch is on the MEASURE position.
• Remove the protective cap from the
electrode, rinse and immerse it in
pH 7.0 buffer solution. Stir gently
and wait a couple of minutes for the
reading to stabilize.
Note: The electrode should be submerged
approximately 4 cm (1½”) in the
solution.
• With the calibration screwdriver,
adjust the “pH 7” trimmer
until the LCD shows “pH 7.0”.
• Rinse and immerse the pH electrode in pH 4.0 (or
pH 10.0) buffer and stir gently.
• Wait a couple of minutes, then
adjust the “pH 4” trimmer
until the LCD shows “pH 4.0”
(or “pH 10.0”).
The calibration is now complete.
4 cm (1½")
CE DECLARATION OF CONFORMITY
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the environment in
which it is used. Operation of this instrument in residential areas could cause unaccept-
able interferences to radio and TV equipment.
The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching
this glass bulb at all times. During operation, ESD wrist straps should be worn to avoid possible
damage to the electrode by electrostatic discharges.
Any variation introduced by the user to the supplied equipment may degrade the instrument’s
EMC performance.
To avoid electrical shock, do not use this instrument when voltages at the measurement surface
exceed 24 Vac or 60 Vdc.
To avoid damages or burns, do not perform any measurement in microwave ovens.
ACCESSORIES
HI 1286 Double junction, plastic body pH electrode
with 2 m (6.6’) cable and BNC connector
HI 2114P/2 Double junction, plastic body pH electrode
with 2 m (6.6’) cable and BNC connector
HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70010P pH 10.01 solution, 20 mL sachet (25 pcs)
HI 7004L pH 4.01 solution, 500 mL bottle
HI 7007L pH 7.01 solution, 500 mL bottle
HI 7010L pH 10.01 solution, 500 mL bottle
HI 70300L Electrode storage solution, 500 mL bottle
HI 7061L Electrode cleaning solution, 500 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
IST981402 05/05
HI 7007
RINSE
HI 7007
CALIBRATION