Hanna Instruments HI981520 User manual

INSTRUCTION MANUAL
Hanna Instruments Inc., 584 Park East Drive, Woonsocket, RI 02895 USA www.hannainst.com
HI981520
Marine Monitor
pH
Marine Salinity
Temperature
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solutions with a positive impact on the environment and climate.
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Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.
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TABLE OF CONTENTS
1. Preliminary Examination ................................................................................................................3
2. General Description & Intended Use ................................................................................................4
3. Specifications................................................................................................................................5
3.1. Monitor .............................................................................................................................5
3.2. Probes...............................................................................................................................6
4. Functional & Keypad Description.....................................................................................................7
5. Installation ...................................................................................................................................8
6. Setup .........................................................................................................................................10
7. Calibration..................................................................................................................................14
7.1. pH ..................................................................................................................................14
7.2. Conductivity .....................................................................................................................16
7.3. Clear Calibration...............................................................................................................17
8. Measurement..............................................................................................................................17
9. Maintenance & Care ...................................................................................................................18
10. Warnings & Errors......................................................................................................................19
11. Accessories................................................................................................................................19
Certification......................................................................................................................................20
Recommendations for Users...............................................................................................................20
Warranty .........................................................................................................................................20
Dear Customer,
Thank you for choosing a Hanna Instruments®product.
Please read this instruction manual carefully before using this instrument as it provides the necessary information
for correct use of this instrument as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e‑mail us at [email protected].
Visit www.hannainst.com for more information about Hanna Instruments and our products.

3 Preliminary Examination
1. PRELIMINARY EXAMINATION
Remove the instrument and accessories from the packaging and examine it carefully. For further assistance,
please contact your local Hanna Instruments office or email us at [email protected].
Each HI981520 is supplied with:
• HI1286 pH electrode
• Attached conductivity and temperature probe
• pH 7.01 buffer solution, 20 mL sachet (2 pcs.)
• pH 10.01 buffer solution, 20 mL sachet (2 pcs.)
• 35.00 ppt salinity calibration solution, 20 mL sachet (2 pcs.)
• Electrode cleaning solution, 20 mL sachet (2 pcs.)
• Suction cup with clip (2 pcs.)
• Self‑adhesive fastener (2 pcs.)
• 12 Vdc power adapter
• Probe quality certificate
• Quick reference guide with QR code for manual download and instrument quality certificate
Note: Save all packing material until you are sure that the instrument works correctly. Any damaged or defective
item must be returned in its original packing material with the supplied accessories.

General Description & Intended Use 4
2. GENERAL DESCRIPTION & INTENDED USE
Testing and monitoring salinity in saltwater aquariums is an ongoing task.
The HI981520 is a vertical‑mount unit that monitors and displays the conductivity (measured with attached
probe) and the pH level (replaceable pH electrode).
Each parameter can be configured for high/low operating mode and the results are displayed on a large, easy
to read LCD.
The system can be calibrated at one or two points for pH and at one point for conductivity.
Seawater salinity is expressed in either parts per thousand (ppt), Practical Salinity Units (PSU), or Specific
Gravity (S.G.).
ppt
Measurements expressed in ppt are based on the Natural Seawater Scale that extends from 0.00 to 80.00 g/L
and covers 10 to 31 °C temperature range. It determines the salinity based upon a conductivity ratio of sample
to standard seawater at 15 °C and an approximate salinity value of 35 in seawater.
PSU
The practical salinity of seawater relates the ratio of electrical conductivity of a normal seawater sample at
15 °C and 1 atmosphere to a potassium chloride solution (KCl) with a mass of 32.4356 g/Kg water at the same
temperature and pressure. Under these conditions the ratio is equal to 1 and S=35. The practical salinity scale
may be applied to values 0 through 42.00 psu at temperatures between 0 to 35 °C.
Specific Gravity (S.G.)
Specific Gravity, or relative density, is expressed as the ratio of the density of seawater, at a specific temperature,
relative to the density of the same volume of pure water at a specific temperature.
The probes are secured with suction cups to the back of an aquarium (tank) and are suited for continuous
measurement of conductivity and associated parameters required in applications such as seawater, saltwater
aquariums, or aquaculture.
The distance between monitored sample and monitor unit extends to 2 m (6.6’) probes cable length.
The system is simple to install (self‑adhesive or screw mount) and easy to setup and use.
Main Features
• Two Alarm operating modes (High/Low Value) for each supported parameter
•
High/Low Alarm generated when measured value exceeds or drops below configured parameter High/Low
Value
• Acoustic signal generated each time an alarm is triggered
• The EC probe contains an integral temperature sensor that simplifies installation
• All readings are compensated for variations in temperature
• Temperature is displayed in °C or °F along with pH and EC readings
• Easy to read LCD display

5 Specications
3. SPECIFICATIONS
3.1. MONITOR
pH
Range* 0.0 to 14.0 pH
Resolution 0.1 pH
Accuracy ±0.2 pH
Calibration Manual or automatic two‑point calibration in 7.01 and 10.01 pH
ppt
Range 0.0 to 70.0 ppt (g/L)
Resolution 0.1 ppt (g/L)
Accuracy ±1.0 ppt between 0.0 ppt and 40.0 ppt
±2.0 ppt between 40.0 ppt and 70.0 ppt
Calibration Automatic, single point in 35.00 ppt
PSU
Range 0.0 to 70.0 PSU
Resolution 0.1 PSU
Accuracy ±1.0 PSU between 0.0 PSU and 40.0 PSU
±2.0 PSU between 40.0 PSU and 70.0 PSU
S.G.
Range 1.000 to 1.041 S.G.
Resolution 0.001 S.G.
Accuracy ±0.001 S.G.
Temperature
Range 0.0 to 50.0 °C (32.0 to 122.0 °F)
Resolution 0.1 °C / 0.1 °F
Accuracy ±0.5 °C / ±1.0 °F
Compensation Automatic, 5 to 50 °C (41 to 122 °F)
Alarm
pH
High or Low with Enable or Disable optionEC
Temperature
High/Low Value with High/Low alarm Enabled
Probes pH HI1286
EC Attached
Power supply 12 Vdc adapter (included) from 115 Vac, and 230 Vac
Environment 0 to 50°C (32 to 122°F); RH max 95%, non‑condensing
Casing IP65 ingress protection
Dimensions 125 x 185 x 38 mm (4.92 x 7.28 x 1.49”)
Weight 300 g (10.6 oz)
* The range may be limited by the probe’s limits.

Specications 6
3.2. PROBES
HI1286 pH Electrode
Range 0 to 13 pH
Recommended operating temperature 0 to 80 °C (32 to 176 °F)
Body PEI
Junction PTFE
Reference Double junction, Ag/AgCl
Electrolyte Polymer
Tip Spheric (Ø 7.5 mm / 0.29”)
Outer diameter 12 mm (0.47”)
Overall length 160 mm (6.29”)
Maximum pressure 3 bar (44 psi)
Cable Coaxial, 2 m (6.56’)
Connection BNC
The PEI (Polyetherimide) resin body is easy to clean and resistant to many aggressive chemicals.
The porous PTFE (Polytetrafluoroethylene) junction is equally resistant to aggressive chemicals.
The double junction design presents a silver‑free electrolyte solution interacting with the sample, making the
electrode less susceptible to clogging and guaranteeing a fast response and stable reading.
Attached EC & Temperature Probe
Range
0.0 to 70.0 ppt
0.0 to 70.0 PSU
1.000 to 1.041 S.G.
Recommended operating temperature 0 to 50 °C (32 to 122 °F)
Body Polypropylene (PP)
Conductivity sensor Material ABS
Electrode Graphite
Temperature sensor AISI 316 stainless steel
Outer diameter 12.50 mm (0.49”)
Overall length 155 mm (6.10”)
Maximum pressure 3 bar (44 psi)
Cable Coaxial, 2 m (6.56’)
Built‑in temperature sensor at the tip of the EC sensor allows for rapid determination of the sample temperature
and a high‑accuracy temperature reading.

7 Functional & Keypad Description
4. FUNCTIONAL & KEYPAD DESCRIPTION
Front & Rear View
CALSETUP
Marine Monitor
26.1
32.0
8.4
6
1
3 5
2
4
4
5
3
1. Liquid Cristal Display (LCD)
2. Keypad
3. Power adapter cable
4. pH electrode DIN connector
5. Conductivity (EC) probe cable
6. Mounting holes
Keypad Description
tPress to enter/exit setup menu.
z Press to enter/exit calibration menu.
e Press to edit items.
a v Press to navigate menus and select items.
w Press to exit setup/calibration or cancel value edit (revert to previous value).

Installation 8
LCD Description
31 2
7
8
9
10
11
12
4 5
1413
15
6
18
17
16
1. Setup menu tag ( S)
2. pH Alarm indicators, High ( U) or Low ( D)
3. First LCD line, pH reading
4. First LCD line measurement unit ( pH )
5.
Automatic temperature compensation tag ( ATC )
6. pH calibration buffer tags ( 70)
7. Stability indicator ( %)
8. Calibration menu tag ( C)
9. Alarm tag ( ALARM )
10. Second LCD line, conductivity reading
11. EC Alarm indicators, High ( U) or Low ( D)
12. Third LCD line, message area / temp. reading
13. Third LCD line, temperature unit (°C or °F)
14. Temp. Alarm indicators, High (U) or Low (D)
15. Navigation arrows ( <u
d>) available in setup
or calibration menu
16. Second LCD line, conductivity measurement unit
( ppt, PSU, SG )
17. EC tag ( E)
18. Calibrated tag ( CAL )
5. INSTALLATION
Monitor Mount
Supplied pre‑cut strips feature a strong adhesive that adheres to most smooth surfaces e.g. glass, metal, tile.
• the rough side should be affixed to the (tank) wall
• the smooth side affixed to the monitor
1. Clean the surface the strip is affixed to.
2. Peel off the protective backing and firmly press against the surface.
3. Allow adhesive bond to set for 24 hours before mounting the instrument.
Note: Do not reuse the strips.

9 Installation
Attach the Suction Cup & Secure the Probe
1. Clean and dry the surface the cup is affixed to.
2. Wipe clean (soapy water) the inside of the cup and pat dry.
3. Stick the cup on the aquarium (tank) wall.
4. Firmly press the suction cup down in the middle.
(with use, regularly press the cup down to get rid of any air pockets)
5. Allow the seal to set before clicking in the probe.
6.
Using the cup, secure the probe to the back of the aquarium (tank) so that the
temperature sensor (EC) and junction (pH) part of the probe is submerged.
Note: Regularly check the suction cup grip.
Alternative Screw Mount Option (user supplied)
1. Prepare the correct screws and screwdriver.
2. Use the keyholes at the top and bottom of the monitor
panel as a reference to mark the position of the screw
holes on the wall.
3. Drill the screw holes.
4. Install screw anchors if attaching to masonry.
5. Align the panel keyholes over the drilled holes.
6. Secure controller in place by installing screws in the holes.

Setup 10
6. SETUP
• Press tkey to enter/exit setup menu.
• Press a/ v key to navigate the menu and select items
• Press e key to edit items. Press a/ v key to edit values (blinking).
• Press e key after editing to save the value or w key to exit edit mode without saving.
• Press t key to exit setup and save changes.
General Settings (Options / Default)
Temperature Unit
°C or °F
(°C)
°C
TEMP
°F
TEMP
Salinity Unit
PPt, PSu, SG
(PPt)
PPt
SALINITY
PSu
SALINITY
SG
SALINITY
Backlight
On or Off
(On)
On
BACKLIT
OFF
BACKLIT
Key Beeper
On or Off
(On)
On
KEY BEEP
OFF
KEY BEEP
Alarm Sound
On or Off
(On)
On
ALARM SO
OFF
ALARM SO
“ALARM SOUND” is scrolled on the bottom of the LCD.