User Guide

OPERATIONAL GUIDE
pH and ORP Electrodes Connection
In order to protect the instrument against vapors and humid-
ity, the BNC connectors are shielded behind waterproof sheaths.
• Slide the protective sheaths down. Connect the pH and
the ORP electrodes to the BNC connectors and then slide
the protective sheaths back up to the casing. For
maximum waterproof protection, make sure the connec-
tors are completely covered.
• Do not be alarmed if white crystals appear around the
electrode protective cap. This is normal with pH and
ORP electrodes and they dissolve when rinsed with
water.
Taking Measurements
• Turn the meter on by connecting the 12VDC power
adapter to the meter and the mains.
• Remove the protective cap from the pH and ORP
electrodes.
• Immerse the tips (4cm/1½”)
of pH, ORP electrodes and
ground probe in the sample.
In order not to affect the
accuracy of measurements,
electrodes should not touch
or stand close to the vessel’s
walls or bottom.
• The 2 LCDs will show the
pH and ORP values. Allow
the readings to stabilize.
Adjusting the Setpoint
With HI981406 you can select your own setpoints and be
alerted through two independent pH and ORP alarm LEDs
when an abnormal situation arises.
• Unscrew and remove the rear panel and gasket seal to
access the MEASURE/SET switches and move them to the
left (SET).
• With a small screwdriver adjust the setpoint trimmers to
display the desired value shown on the LCD. You can
choose to adjust one or both setpoints at once inside the
following ranges:
pH: from 5.0 to 9.0
ORP: from 350 to 850 mV
The pH LED blinks when the pH is higher than the
setpoint.
The ORP LED blinks when the ORP is lower than the
setpoint.
• Move the switches back to MEASURE and secure the rear
panel properly replacing the gasket.
Electrode Maintenance
• When not in use, rinse the electrodes with water to
minimize contamination and store them with a few
drops of storage (HI 70300) solution in the protective
cap. Always replace the protective cap when not in use.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR
STORAGE PURPOSES.
• If the electrodes have been left dry, soak the tips in a
storage (HI 70300) solution overnight to reactivate
them.
• To minimize clogging and provide longer life for the
electrodes, it is recommended to clean them at least once
a month. Immerse the tip of the electrodes in a HI 7061
cleaning solution for half an hour and then rinse with
tap water.
ORP Electrode
Check the accuracy of the meter by immersing the ORP electrode
in a HI 7020 solution. The reading should be between 200
and 275 mV at 20°C (68°F). Otherwise clean the platinum tip
of the electrode by rubbing it with a soft cotton or lint-free cloth
soaked with HI 7061 cleaning solution, or alcohol
After cleaning, condition the ORP electrode by leaving it in a
pretreatment oxidizing (HI 7092) solution for half an hour.
The instrument must be recalibrated whenever:
a) The pH electrode is cleaned or replaced.
b) Where high accuracy is required.
c) At least once a month.
pH Calibration
Pour a small quantities of pH 7.0 (HI 7007) and pH 10.0
(HI 7010) solution (or alternatively pH4.0) 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.
pH 4.0 (HI 7004) is recommended for measuring acidic samples.
Use pH 10.0 (HI 7010) if subsequent samples are alkaline.
• Turn the meter on and make sure that the MEASURE/SET
switch is on MEASURE (inside the back cover).
• Remove the protective cap from the electrode, rinse and
immerse it in the pH 7.0 buffer. Stir gently and then
wait a couple of minutes for the reading to stabilize.
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 the pH 10.0 (or
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.
pH CALIBRATION
HI 2114P/2 Double-junction, plastic body pH electrode with
2 m (6.6’) cable and BNC connector
HI 3214P/2 Double-junction, plastic body ORP electrode
with 2 m (6.6’) cable and BNC connector
HI 1283 * Stainless steel grounding bar 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 70010P pH 10.01 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 7010M pH 10.01 solution, 230 mL bottle
HI 7020M ORP 200/275 mV solution, 230 mL
HI 7092M Oxidizing solution, 230 mL
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
ACCESSORIES
CE DECLARATION OF CONFORMITY