HANNA Instruments HI 981404N, HI 981405N pH & TDS EC Monitor Instruction Manual
Summary
This multi-parameter measuring meter provides accurate readings for pH, Total Dissolved Solids (TDS), and Electrical Conductivity (EC). The comprehensive manual guides users through setup, proper operation, and detailed calibration using multiple buffer solutions. It covers technical specifications, electrode maintenance, storage procedures, and troubleshooting tips to ensure reliable water quality monitoring in diverse environments. Ideal for laboratory professionals or individuals requiring precise measurements of liquid samples.
Page 1 Text Content
Dear Customer,
Instruction Manual
FUNCTIONAL DESCRIPTION SPECIFICATIONS
Thank you for choosing a Hanna product. Please read carefully this instruction manual before using the meter. Common Specifications If you need additional technical information, do not hesi-
Range 0.0 to 14.0 p H
(HI 981404N and HI 981405N) tate to e-mail us at [email protected].
Resolution 0.1 p H
These instruments are in compliance with the directives.
Accuracy (@ 25°C/77°F) ±0.2 p H
p H & TDS/EC Monitors
Calibration Manual, 1 or 2 point
PRELIMINARY EXAMINATION
Probes HI 1286 p H electrode (included) and
Remove the instrument from the packing material and HI 1283 grounding probe (fixed) examine it carefully. If any damage has occurred during
Environment 0 to 50°C (32 to 122°F); RH max 95%
shipment, immediately notify your Dealer or the nearest
Hanna Customer Service Center. Power Supply 12 Vdc adapter (included)
Each meter is supplied complete with: Dimensions 160 x 110 x 35 mm (6.3 x 4.3 x 1.4”) HI 1286 p H electrode
Weight 300 g (10.6 oz.)
HI 1283 grounding probe
HI 981404N only
Conductivity probe
Range 0 to 1990 mg/L (ppm)
HI 7634 for HI 981404N & HI 7632 for HI 981405N Calibration screwdriver Resolution 10 mg/L (ppm) 12 Vdc power adapter and instructions
Accuracy (@ 25°C/77°F) ±2% f.s.
Note: Conserve all packing material until the instrument
TDS Factor 0.7 ppm = 1 µS/cm
has been observed to function correctly. Any defective item must be returned in its original packing. Temperature Automatic, 5 to 50°C (41 to 122°F)
Compensation TDS only Calibration Manual, 1 point
WARRANTY GENERAL DESCRIPTION
TDS Probe HI 7634 (fixed)
HI 981404N and HI 981405N are warranted for two years HI 981404N (p H and TDS) and HI 981405N (p H and EC) 1. Liquid Crystal Displays
HI 981405N only
against defects in workmanship and materials when used for their in- are specially designed to meet the needs of simple continuous
2. “p H 4” calibration trimmer
tended purpose and maintained according to instructions. The probes Range 0.00 to 9.99 m S/cm
monitoring. 3. “p H 7” calibration trimmer
are warranted for a period of six months. This warranty is lim-
You can simply install the meter above the sample to be Resolution 0.01 m S/cm
ited to repair or replacement free of charge. 4. BNC connector
tested for continuous measurement. 5. Protective sheath Accuracy (@ 25°C/77°F) ±2% f.s.
Damages due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. The HI 1286 gel-filled p H electrode features a waterproof 6. HI 1286 p H electrode
Temperature Automatic, 5 to 50°C (41 to 122°F)
If service is required, contact the dealer from whom you purchased the sheath to protect BNC connector against humidity and
7. HI 1283 grounding probe
Compensation EC only
instrument. If under warranty, report the model number, date of pur- vapours. Moreover, the unique design of the electrode
8. HI 7632 or HI 7634 probe (depending on model)
chase, serial number and the nature of the failure. If the repair is not
provides longer life in aggressive solutions. Calibration Manual, 1 point
covered by the warranty, you will be notified of the charges incurred. If 9. 12 Vdc power adapter
The meter is equipped with two large LCDs for easy-to-read EC Probe HI 7632 (fixed)
the instrument is to be returned to Hanna Instruments, first obtain a 10. Power supply connector
Returned Goods Authorization Number from the Customer Service de- measurements even from a distance.
11. EC or TDS calibration trimmer
partment and then send it with shipment costs prepaid. When shipping Measurements are accurate and the meters can be cali- any instrument, make sure it is properly packaged for complete protec-
brated at one or two points for p H, and at a single point
tion. Recommendations for Users
for TDS and EC.
Before using this product, make sure that it is entirely suitable for the environment in
You no longer need to worry about battery changes because which it is used. Operation of this instrument in residential areas could cause unaccept-
able interferences to radio and TV equipment.
these units run without interruption on 12 Vdc power
All rights are reserved. Reproduction in whole or in part is prohibited The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching
supply.
the bulb at all times. During operation, ESD wrist straps should be worn to avoid possible
without the written consent of the copyright owner, Hanna Instru-
damage to the electrode by electrostatic discharges.
ments.
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
Hanna Instruments reserves the right to modify the design, construction
measurement surface exceeds 24 Vac or 60 Vdc. To avoid damage or burns, do not perform
and appearance of its products without advance notice.
any measurement in microwave ovens.
Page Summary Contents For HANNA Instruments HI 981404N, HI 981405N pH & TDS EC Monitor Instruction Manual
Manual Details
| Brand | Hanna Instruments |
|---|---|
| Pages | 2 |
| File Size | 561.60 KB |
| Published | May 21, 2026 |
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Frequently Asked Questions
How should I store the electrode when not in use?
Rinse it with water, remove the protective cap, and immerse it in a storage solution or pH 7.0 buffer.
What measures must I take during operation?
Wear ESD wrist straps to prevent electrostatic discharge damage and do not use it near microwave ovens.
What type of power supply does the meter require?
The instrument runs on a 12 Vdc power adapter that is included with the device.
How do I contact support for technical questions?
For additional technical information, you can email [email protected].