Hanna Marine 981520 Monitor
Marine Monitor pH, Marine Salinity and Temperature
Testing and monitoring salinity in saltwater
aquariums is an ongoing task.
The HI981520 is an easy to use vertical mount unit that continuously monitors and displays conductivity and pH.
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.). A high/low alarm can be configured for each parameter and the results are displayed on a large, easy to read LCD. The attached two-electrode conductivity probe
features a built-in temperature sensor for rapid, high-accuracy temperature readings.
The Hanna HI1286 pH double junction, gel-filled pH electrode features a PEI resin body that is easy to clean and resistant to many aggressive chemicals.
Additionally, the double junction design is less susceptible to clogging for fast and stable readings.
• Automatic temperature compensation (ATC)
• Dual pin graphite EC probe
Easy to read backlit LCD display with the option to change LCD color from the setup menu
A one or two-point pH calibration can be performed using one of the two standard buffer solutions: 7.01 or 10.01pH. A one-point conductivity calibration can be performed using
35.00 ppt salinity standard solution. CAL Tags display in measurement mode after a calibration has been performed for visual reminder.
Automatic Temperature Compensation
All readings are compensated for variations in temperature and can be displayed with temperature values in °C or °F. Choose °C or °F measurement through the setup menu.
High/Low alarms can be set for each supported parameter (or can be
disabled) quickly through the setup menu.
Alarms are generated when measured value exceeds or
drops below configured parameter High/Low Value.
Optional Acoustic Alarm
An acoustic signal can be generated each time an alarm is
triggered and can be silenced at the touch of a button. Enable
or disable this feature easily through the setup menu.
Choice of Units
Seawater salinity units can be chosen through the setup menu.
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.
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.
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 and 40.0 PSU
±2.0 PSU between 40.0 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 option
EC High or Low with Enable or Disable option
Temperature High or Low with Enable or Disable option
High/Low Value with High/Low alarm Enabled
Probes pH HI1286
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)
HI981520 Marine Monitor is supplied with HI1286 pH electrode; attached EC 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;
quick reference guide with QR code for manual download and instrument quality certificate.
Solutions and Accessories
HI1286 Double junction pH electrode with 2 m (6.6’) cable
HI70007P pH 7.01 solution, 20 mL sachet (25 pcs.)
HI7007M pH 7.01 solution, 230 mL bottle
HI70010P pH 10.01 solution, 20 mL sachet (25 pcs.)
HI7010M pH 10.01 solution, 230 mL bottle
HI70024M 35.00 ppt salinity calibration solution, 230 mL bottle
HI70024P 35.00 ppt salinity calibration solution, 20 mL sachet (25 pcs.)
HI70300M Storage solution for pH electrodes, 230 mL bottle
HI700601P General purpose cleaning solution, 20 mL sachet (25 pcs.)
HI7061M Cleaning solution for pH electrodes, 230 mL bottle
* The range may be limited by the probe’s limits.
HI1286 pH Probe Specifications
Range 0 to 13 pH
Recommended operating temperature 0 to 80 °C (32 to 176 °F)
Reference Double junction, Ag/AgCl
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’)
EC and Temperature Probe Specifications
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
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 type/length Coaxial / 2 m (6.56’)