Hanna Instruments HI 981404 User Manual
Instruction Manual
(HI 981404N and HI 981405N)
pH & TDS/EC Monitors
http://www.hannainst.com
WARRANTY
HI 981404N and HI 981405N are warranted for one year
against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. The probes
are warranted for a period of six months. This warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed
maintenance are not covered.
If service is required, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not
covered by the warranty, you will be notified of the charges incurred. If
the instrument is to be returned to Hanna Instruments, first obtain a
Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid. When shipping
any instrument, make sure it is properly packaged for complete protection.
To validate your warranty, fill out and return the enclosed warranty card
within 14 days from the date of purchase.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895 , USA.
Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.
These Instruments are in
Compliance with the CE Directives
Dear Customer,
Thank you for choosing a Hanna product. This manual will
provide you with the necessary information for the correct
operation of the meter. Please read it carefully before using
the meter. If you need additional technical information, do
not hesitate to e-mail us at tech@hannainst.com.
These instruments are in compliance with the directives.
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and
examine it carefully. If any damage has occurred during
shipment, immediately notify your Dealer or the nearest
Hanna Customer Service Center.
The meter is supplied with:
• HI 1286 pH electrode
• HI 1283 grounding probe
• HI 7634 TDS probe (for HI 981404N)
• HI 7632 EC probe (for HI 981405N)
• Calibration screwdriver
• 12 VDC power adapter
Note: Conserve all packing material until the instrument
has been observed to function correctly. Any defective
item must be returned in its original packing.
GENERAL DESCRIPTION
HI 981404N (pH and TDS) and HI 981405N (pH and EC)
are specially designed to meet the needs of simple continuous
monitoring.
You can simply install the meter above the sample to be
tested for continuous measurement.
The HI 1286 gel-filled pH electrode is replaceable and the
BNC connector is protected behind a waterproof sheath. The
unique design of the electrode provides longer life in aggressive solutions.
The meter is equipped with two large LCDs which make easy
to read measurements from distance at any time.
Measurements are accurate and the meter can be calibrated at one or two points for pH and at a single point for
TDS and EC.
You no longer need to worry about battery changes either:
the unit runs without interruption on 12 VDC supplied
adapter.
FUNCTIONAL DESCRIPTION
1. Liquid Crystal Displays
2. pH 4.0/10.0 calibration trimmer
3. pH 7.0 calibration trimmer
4. BNC connector
5. Protective sheath
6. HI 1286 pH electrode
7. HI 1283 grounding probe
8. HI 7632 TDS probe or HI 7634 EC probe
9. 12 VDC power adapter
10. Power supply connector
11. EC/TDS calibration trimmer
SPECIFICATIONS
HI 981404 and HI 981405
Range 0.0 to 14.0 pH
Resolution 0.1 pH
Accuracy (@ 25°C/77°F) ±0.2 pH
Calibration Manual at 1 or 2 points
Probes HI 1286 replaceable pH electrode and
HI 1283 grounding probe (included)
Power supply External 12 VDC (adaptor included)
Dimensions 165 x 110 x 35 mm (6.5 x 4.3 x 1.4’’)
Weight 300 g (10.6 oz.)
HI 981404 only
Range 0 to 1990 mg/L (ppm)
Resolution 10 mg/L (ppm)
Accuracy (@ 25°C/77°F) ±2% f.s.
TDS Factor 0.7 ppm = 1 µS/cm
Temp. Compensation Automatic from 5 to 50°C
(41 to 122°F, TDS only)
Calibration Manual at 1 point
Probe HI 7634 TDS probe (included)
HI 981405 only
Range 0.00 to 9.99 mS/cm (EC)
Resolution 0.01 mS/cm (EC)
Accuracy (@ 25°C/77°F) ±2% f.s.
Temp. Compensation Automatic from 5 to 50°C
(41 to 122°F, EC only)
Calibration Manual at 1 point
Probe HI 7632 EC probe (included)
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 unacceptable
interferences to radio and TV equipment.
The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching
the 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 voltage at the measurement surface
exceeds 24 VAC or 60 VDC. To avoid damage or burns, do not perform any measurement in
microwave ovens.
OPERATIONAL GUIDE
pH ELECTRODE CONNECTION
In order to protect the instrument against vapors and humidity, the BNC connector is shielded behind a waterproof sheath.
• Slide the protective sheath down. Connect the pH electrode 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 measurements, 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 temperature 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 STORAGE PURPOSES.
• If the electrode has been left dry, soak the tip in a storage
(HI 70300) or pH7 (HI 7007) solution overnight to reactivate 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.
CALIBRATION
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.
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.
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.
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
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