• Dissolved Oxygen Portable Meter

Dissolved Oxygen Portable Meter

  • Range (Polarographic DO): 0.00 to 20.00mg/L
  • Percent Saturation Range (Polarographic DO): 0.0 to 200.0 % saturation
  • User-friendly operation with basic calibration text prompts

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Take simple, routine dissolved oxygen and temperature measurements with the Thermo Scientific Orion Star A123 Dissolved Oxygen Portable Meter

An easy-to-use and budget-friendly instrument for basic dissolved oxygen analysis in the field. Calibrate polarographic DO probes using water-saturated air or custom value using Winkler titration. Quickly navigate setup menus and ensure consistent calibrations using the simple keypad layout and on-screen text prompts. Use the included electrode stand to easily place sensors in samples and simplify storage.

Thermo Scientific Orion Star A123 dissolved oxygen portable meters are a simple, economical solution for your routine outdoor sample analysis. Featuring an emphasized measure key, selectable read modes and measurement stability indicator, our basic Orion Star A123 dissolved oxygen meters are designed to deliver measurements you can trust at an affordable price.

  • Measure dissolved oxygen in percent saturation or mg/L with temperature using polarographic DO probes
  • Calibrate using water-saturated air or custom value (Winkler titration)
  • Automatically compensate DO readings using ATC temperature, manual salinity input and manual barometric pressure
  • Simplified, easy-to-read display shows main measurement with temperature, stability indicator and electrode condition icon
  • User-friendly operation with basic calibration text prompts
  • Easily recall calibration data for procedure checks
  • Non-volatile memory preserves 50 point internal data log and meter settings, even with loss of power
  • Flexible power options with AA batteries or optional universal power adapter
  • IP67-rated housing is waterproof for rugged field operation
  • Meter kits include hard-sided field case and protective meter armor with electrode holders, adjustable wrist/belt strap and built-in meter stand
  • Meters offer CE, TUV 3-in-1 and FCC Class A certifications and 3-year replacement warranty


Many configurations, electrodes, consumables and accessories available on request.

Range (Polarographic DO)0.00 to 20.00mg/L
Resolution (Polarographic DO)0.01, 0.1mg/L
Accuracy (Polarographic DO)±0.2mg/L or ±2% of reading, whichever is greater
Percent Saturation Range (Polarographic DO)0.0 to 200.0 % saturation
Percent Saturation Relative Accuracy (Polarographic DO)±2 % saturation or ±2% of reading whichever is greater
Percent Saturation Resolution (Polarographic DO)0.1, 1 % saturation
Sensor TypesPolarographic dissolved oxygen sensor
Barometric Pressure Correction450 to 850mmHg, automatic with manual entry
Pressure Range450 to 850mmHg (manual entry)
Salinity Factor0 to 45 ppt, automatic correction using manual entry of sample salinity
Calibration ModesWater-saturated air, manual (Winkler titration)
Range (Temperature)0.0 to 50.0 °C, 32.0 to 122.0 °F
Resolution (Temperature)0.1°C, 0.1°F
Accuracy (Temperature)±0.1°C
Temperature SelectionAutomatic with ATC temperature probe
Temperature Probe Calibration1 point temperature offset calibration
Channels1
Display TypeLCD
KeypadSimple with highlighted measure key, scroll and shortcut keys
Measurement ModesDissolved oxygen as % saturation or mg/L with temperature
StabilitySmart Stability and Smart Averaging
Data Management DetailsInternal data point memory
Data Points50
Log Function TypeAutomatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
MemoryNon-volatile memory preserves log and settings
LanguagesEnglish
Inputs9 pin MiniDIN (polarographic DO sensor with built-in temperature)
OutputsNone
Probe TypePolarographic dissolved oxygen probe (purchase separately)
Power Supply4 AA batteries (included) or universal AC adapter (sold separately)
AC AdapterUniversal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Battery Life2000 hours
Battery TypeFour AA (included)
IP RatingIP-67
Certifications/ComplianceCE, TUV 3-1, FCC Class A
Operating Temperature41° to 113°F (ambient)
5° to 45° C (ambient)
Relative Humidity Range5 to 85 %, non-condensing
Dimensions (L x W x H)24cm x 10cm x 6.5cm (9.5 in. x 3.9 in. x 2.6 in.)
Weight2 lb.
0.5kg
Warranty3 year meter warranty