Orion Star A323 Dissolved Oxygen Portable Meter

  • High Range DO Applications Dissolved oxygen measurement range from 0 to 90 mg/L
  • Non-Volatile Memory Memory capacity to store up up 1000 time and date stamped data points
  • Warranty A323 dissolved oxygen meter is covered by a 3 year replacement meter warranty
Product Options


The Orion Star A323 Portable Dissolved Oxygen Meter is the ideal option for advanced measurement on location. The informative large backlit graphic LCD displays dissolved oxygen in percent saturation or concentration with temperature and electrode status.

Data can easily be updated and transferred using the USB and RS232 ports and complimentary data analysis software. Accurate results are presented with automatic temperature, manual salinity and automatic/manual barometric pressure compensation. The portable handheld DO meter has the capacity to store up to 5000 data points with time and date stamps.

Advanced features such as stability and averaging options with further additional options allow for laboratory accuracy. Calibration can be completed using water-saturated air, air-saturated water, zero point calibration or Winkler titration. Orion polarographic and RDO optical/luminescence-based probes are automatically accepted by the meter meaning they are DO probe compatible. Standard display features include time, date, sample ID, user ID and calibration points. Multilanguage options in English, Spanish, French, Italian, German and Chinese allow for everyone to use this meter.

Readings will not be missed due to addition of AUTO-READ™ which locks stable readings on the screen and the ready indicator alerts when readings are stable. If required, data can be gathered at specific time intervals. The Orion Star A323 Dissolved Oxygen Portable Meter is portable, fully waterproof and housed with IP67-rated protection. Power can be sought either by using batteries which give over 800 hours of operation or powered using the universal power adapter to use AC power.

Included in the package is a 3 year meter replacement warranty.

Manufactured by: Thermo Scientific
Model: Orion Star A323 Dissolved Oxygen Portable Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


River monitoring
Fisheries monitoring
Tank measurement


Dissolved Oxygen -
Concentration - Polarographic
Range 0 to 90 mg/L
Resolution 0.01, 0.1
Relative Accuracy ±0.2
% Saturation - Polarographic
Range 0 to 600
Resolution 0.1, 1
Relative Accuracy ±2 %
Concentration - RDO
Range 0 to 50 mg/L
Resolution 0.01, 0.1
Relative Accuracy ±0.1 mg/L up to 8 mg/L;
±0.2 mg/L from 8 to 20 mg/L;
10 % of reading from
20 to 50 mg/L
% Saturation - RDO
Range 0 to 500
Resolution 0.1, 1
Relative Accuracy ±2 %
Manual Barometric Pressure Correction 450.0 to 850.0 mm Hg
Manual Salinity Factor Correction 0 to 45 ppt
Calibration Features Water saturated air,
air saturated water, manual (Winkler) and zero point
Probe Characteristics Polarographic or RDO
Range 0 to 50 °C, 32 to 122 °F
Resolution 0.1
Relative Accuracy ±0.1
Offset Calibration 1 point
Number of Points 1000 with time and date stamp
Log Function Manual, Automatic with AUTO-READ™
Log Edit Delete last reading or all
DO with
Temperature Probe
9-pin mini-DIN
Output RS232, USB
AC Adapter Optional universal, 100-240 VAC
Battery Power Included 4 AAs
Battery Life 800 hrs


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