Hanna Instruments HI 981406 - Manual (Page 2)

OPERATIONAL GUIDE
pH and ORP Electrode Connection
In order to protect the instrument against vapors and
humidity, 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. For maximum protection,
make sure the connectors 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 12 Vdc power
adapter to the meter and the mains.
• Remove the protective caps
and immerse the tips (4cm/
1½”) of the electrodes and
the ground probe into the
sample to be monitored. In
order not to affect the mea-
surement accuracy, the
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 Setpoints
With HI 981406 you can select two separate setpoints for pH
and ORP, and be alerted through two independent alarm
LEDs when an abnormal situation occurs.
• To access the MEASURE/SET switches, unscrew and remove
the rear panel and gasket seal. Move the switches to the
left (SET) position.
• With a small screwdriver adjust the setpoint trimmers to
display the desired setpoint value on the LCD. You can
adjust one or both setpoints at once in the following
ranges:
pH: from 5.0 to 9.0
ORP: from 350 to 850 mV
The pH LED blinks when the pH reading exceeds the
setpoint, while the ORP LED blinks when the ORP reading
falls below the setpoint.
• Move the switches back to the MEASURE position and
replace the rear panel, while making sure the gasket is in
place before tightening the screws.
Electrode Maintenance
• When not in use, rinse the electrodes with water and store
them with a few drops of HI70300 storage solution in the
protective cap. Always replace the protective cap after use.
NEVER USE DISTILLED OR DEIONIZED WATER FOR STOR-
ING THE ELECTRODES.
• If the electrodes have been left dry, immerse the tips in
HI70300 storage solution overnight to reactivate them.
• To minimize clogging and provide longer life to the
electrodes, it is recommended to clean them at least once
a month. Immerse the tips in HI 7061 cleaning solution
for 30 minutes and then rinse with tap water.
ORP Electrode
Check the accuracy of the meter by immersing the ORP
electrode in HI 7020 test 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 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 30 minutes.
For best accuracy, it is recommended to calibrate the instru-
ment frequently. The meter should also be recalibrated:
a) whenever the pH electrode is cleaned or replaced
b) where high accuracy is required
c) at least once a month.
Calibration Procedure
Pour a small quantities of pH 7.0 (HI 7007) and pH 10.0 or
pH 4.0 (HI 7010 or HI 7004) solution into two clean beakers.
For an 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.
Choose the pH 4.0 (HI 7004) buffer as second calibration
solution if you are going to measure acidic samples; use pH
10.0 (HI 7010) for alkaline samples.
• Turn the meter on and check that the pH MEASURE/SET
switch is on MEASURE position.
• Remove the protective cape, then rinse and immerse the
electrode in the pH 7.0 buffer. 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.
• Adjust the pH7 trimmer 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 adjust the pH4 trimmer
until the LCD shows “pH 10.0” (or “pH 4.0”).
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 200/275 mV test solution, 230 mL
HI 7092M Pretreatment oxidizing solution, 230 mL
HI 70300M Electrode storage solution, 230 mL bottle
HI 7061M Electrode cleaning solution, 230 mL bottle
HI 710005 115 Vac/12 Vdc power adapter, US plug
HI 710006 230 Vac/12 Vdc power adapter, European plug
* To be replaced by authorized technical personnel only.
ACCESSORIES
CE DECLARATION OF CONFORMITY