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SKU HI98198 Category

Optical Dissolved Oxygen Meter HI98198

The HI98198 opdo™ meter is a rugged, portable dedicated dissolved oxygen (DO) meter designed for fresh and saltwater measurements of dissolved oxygen. This professional, waterproof meter complies with IP67 standards and measures DO, barometric pressure, and temperature. The HI98198 is supplied with a HI764113 digital optical dissolved oxygen probe in a custom thermoformed durable carrying case with accessories. It is compact and ergonomically designed to provide ready access to the materials required for routine sampling.

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The HI98198 opdo meter is only compatible with the Hanna HI764113 digital dissolved oxygen probe.

Concentration measurements are automatically  compensated for barometric pressure, temperature and salinity. Barometric pressure and temperature are automatically measured and compensated. Salinity is automatically compensated by setting manually the salinity concentration of the water being measured. The meter also has a built in application to measure and calculate BOD (Biological Oxygen Demand), OUR (Oxygen uptake rate), and SOUR (Specific Oxygen Update Rate).

Design Features

  • Digital optical probe with Quick Connect
  • IP67 rated waterproof, rugged enclosure
  • Clear, dot matrix, back-lit display with multifunction virtual keys
  • A dedicated HELP key for assistance anytime.

Technical Features

  • Percent saturation or concentration
    • measurements (mg/L)
  • One or two-point calibration at 0 or/and 100% saturation (with auto recognition).
  • Automatic temperature compensation
    • with one-point temperature calibration
  • Salinity compensation
    • Salinity compensation allows for direct determination of dissolved oxygen in saline waters. Users can set the salinity value
  • A user selectable “Calibration due” warning.
  • Built-in calculations 
    • Biochemical Oxygen Demand (BOD), Oxygen Uptake Rate (OUR) and Specific Oxygen Uptake Rate (SOUR) modes
  • Built-in barometer
    • Automatic barometric pressure compensation with 1 point calibration
  • Displays pressure in user-selectable units (mmHg, inHg, atm, psi, kPa, mbar)
  • Log on demand with 4000 records capability.
  • AutoEnd freezes the next stable measurement value on the display.
  • GLP
    • A dedicated GLP key that includes at last 5 calibrations with time, date, calibration points as well as barometric pressure, temperature and salinity setting.
  • USB-C port for easy data transfer to memory stick, PC or other compatible device
  • Displays temperature in °C or °F
  • Approximately 200 hours of continuous use using 4 AA batteries
Optical Dissolved Oxygen Meter

Increased Traceabilty

Ensure that your data can be trusted with GLP data. Accessible by a fixed dedicated key, this data includes date, time, pressure, calibrated value, temperature and salinity value of the last calibration.

Versatile Data Logging

The HI98198’s log-on-demand feature allows you to store up to 4000 readings. The AutoEnd button can be used during measurement to hold the first stable reading on the display automatically.

Focus on What Matters

When you put on a new cap, your meter will detect and initialize it. It will remind you when your cap needs to be replaced, is damaged, or is missing, giving you one less thing to worry about.

Superior Field Usability

An IP67-rated, waterproof meter means that bad weather, splashes, and dust won’t stop you from taking important measurements. The HI98198 is built to withstand immersion in water of 1m for up to 30 minutes. A large display and back light feature ensure that all of your important information is easily visible, no matter the amount of light.

Universal Port

The ultra-versatile USB-C port integrates seamless transfer of data. There is no need for software- simply connect a USB-C and send your data as a .csv to a memory stick, computer, or android device.

Quick Connect Probe

The Quick Connect fitting is designed for quick and easy installation of the DO probe. A watertight connection without threads make attaching and removing the probe simple.

Optical Dissolved Oxygen Meter
Optical Dissolved Oxygen Meter

HI764113 Rugged Optical DO Probe for Fresh and Saltwater Applications

Built Strong

A robust ABS body and stainless steel protective guard ensure durability when measuring in tough environments. With an IP68 rating, this probe is totally sealed against water and dust.

Professional Level Performance

The domed cap repels bubbles for better measurement sensitivity, providing a fast response time.

Minimize Hassle

With no additional membranes to change and no electrolyte needed, the opdo probe is ready to work right when you need it.

Smart Cap Technology

Automatic Cap Recognition

Hanna’s Smart Caps feature a built-in RFID reader that is able to store important data, including manufacture date and first-use date for increased traceabilty.

Longer Life

Smart Caps last one year from the date of first use. Your meter will automatically count down from initialization and will have your meter remind you when it has expired with an on-screen message.

Aligned Right Every Time

An alignment key ensures that your Smart Cap is on correctly every time.

Optical Dissolved Oxygen Meter


The Hanna HI764113 optical DO sensing probe is based on the principle of  fluorescence quenching. The sensing method features an immobilized Pt based luminophore that is excited by the light of a blue LED and emits a red light. Dissolved oxygen quenches this excitation. When there is no oxygen present, the lifetime of the signal is the greatest; as oxygen hits the sensing surface, the lifetime becomes shorter. The intensity and lifetime are inversely proportional to the amount of oxygen present; as oxygen interacts with the luminophore it reduces the intensity and lifetime of the luminescence. The lifetime of the luminescence is measured by a photodetector, and is used to calculate the dissolved oxygen concentration. This is in turn reported by the meter as a % saturation or mg/L reading of Dissolved Oxygen. The major components of the probe include a blue LED for excitation, a red LED that is used as a reference light, and a photodetector. The Smart Cap™ is locked in place on the optical probe and includes the immobilized O₂ sensitive luminophore with rugged insoluble black oxygen permeable protective layer.

Over time, the sensor’s optical components can age but are compensated for by using the reference signal to compensate the measuring path. As a result, the sensor provides accurate DO measurements over long periods of time without the need for frequent calibration.


Dissolved Oxygen


0.00 to 50 mg/L (ppm); 0.0 to 500.0% saturation


0.01 mg/L (ppm); 0.1% saturation


1.5% of reading ± 0.01mg/L for 0.00-20.00mg/L; 5% of reading for 20.00-50.00mg/L; 1.5% of reading ±0.1% for 00-200.0%; 5% of reading for 200.0-500.0%


one or two points automatic calibration at 100% (8.26
mg/L) and 0% (0 mg/L); Single point manual using a value
entered by the user in % saturation or mg/L

Barometric Pressure


420 to 850 mmHg


1 mmHg


±3 mmHg within ±15% from the calibration point


single point anywhere within pressure range



-5.0 to 50.0°C (23 to 122°F)


0.1°C (0.1°F)


±0.3°C (±0.4°F)


single point anywhere within temperature range

Additional Specifications

Temperature Compensation

automatic from -5.0 to 50.0°C (23.0 to 122.0°F)

Pressure Compensation

automatic from 420 to 850 mmHg

Salinity Compensation

automatic from 0 to 70 PSU (manually set)


HI764113 optical DO probe with stainless steel, weighted
protective sleeve, internal temperature sensor, 7-pin DIN
connector and 4m (13’) cable (included)


On demand with 4000 records capability


1.5V (4) AA batteries / approximately 200 hours of
continuous use without backlight (50 hours with backlight)

Auto Off

user-selectable: 5, 10, 30, 60 min or disabled

PC Connectivity

USB Type-C


185 x 93 x 35.2 mm (7.3 x 3.6 x 1.4”)

Weight with batteries

450 g (15.9 oz.)

Case Ingress
Protection Rating



0 to 50 °C (32 to 122 °F) max. RH 100%

Ordering information

HI98198 is supplied with HI764113 Optical DO probe with built-in temperature sensor,
protective shield and 4 m (13’4) cable, HI764113-1 Smart Cap™ with o-ring, HI7040
Bicomponent Zero Oxygen Solution, Calibration/storage vessel, 100 mL plastic beaker
(2), 1 syringe with silicon grease, 1 lens wipe, 1.5V AA batteries (4), Instruction manual,
meter quality certificate, probe quality certificate, cap quality certificate, HI920016 USB
Type A to C cable in a rugged carrying case

Additional Informations

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