• Dissolved Oxygen Portable Meter

Dissolved Oxygen Portable Meter

  • Measure dissolved oxygen in percent saturation or mg/L with temperature
  • RDO optical or polarographic DO probe for ultimate flexibility in sensors

Record accurate and reliable dissolved oxygen and temperature measurements with the Thermo Scientific Orion Star A223 Dissolved Oxygen and RDO Portable Meter.

Ideal for a wide range of applications and advanced dissolved oxygen analysis in the field.

Use RDO optical or polarographic DO probes and calibrate using water-saturated air, air-saturated water, custom value (Winkler) or zero point options. Log up to 1000 data point sets with time / date stamp and easily transfer via USB or RS232 to a printer or computer. Waterproof meter ensures durable, rugged performance with an IP67-rated housing.

Don’t leave your measurements to chance when analyzing samples outside the lab. Orion Star A223 RDO/DO portable meters are designed to offer the reliability you need in a user-friendly package for your dedicated dissolved oxygen testing needs. This waterproof portable meter displays critical data with your measurement including temperature, date and time, read type, measurement stability, active calibration info and power source status.

  • Measure dissolved oxygen in percent saturation or mg/L with temperature using Orion RDO optical DO probes or Orion polarographic DO probes
  • Calibrate dissolved oxygen using water-saturated air, air-saturated water, custom value (Winkler titration) and zero point options
  • Automatically compensate dissolved oxygen readings using ATC temperature, manual salinity input and built-in barometer for barometric pressure readings
  • Informative, easy-to-read backlit graphic display with clear onscreen instructions simplifies operation
  • Capture your critical readings with measurement stability indicator and selectable read modes – Auto-Read holds a stable reading and Continuous shows changing readings with hold option
  • Data log collects and date/time stamps up to 1000 measurement sets
  • Non-volatile meter memory ensures your data and settings are protected, even with loss of power
  • Orion Star Com software facilitates data transfer to a computer via USB or RS232 connections
  • 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 90.00mg/L
Resolution (Polarographic DO) 0.01, 0.1mg/L
Accuracy (Polarographic DO) ±0.2mg/L or ±2% of reading, whichever is greater
Range (RDO) 0.00 to 50.00mg/L
Resolution (RDO) 0.01, 0.1mg/L
Accuracy (RDO) ±0.1mg/L up to 8mg/L, ±0.2mg/L from 8 to 20mg/L, ±10% of reading up to 50mg/L
Percent Saturation Range (Polarographic DO) 0.0 to 600.0 % 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 Types RDO optical dissolved oxygen sensor or polarographic dissolved oxygen sensor
Barometric Pressure Correction 400 to 850mmHg, automatic using built-in barometer or manual entry
Pressure Range 400 to 850mmHg
Pressure Resolution 1mmHg
Accuracy (Barometer) ±6mmHg
Salinity Factor 0.0 to 45.0 ppt, automatic correction using manual entry of sample salinity
Calibration Modes Water-saturated air, air-saturated water, manual (Winkler titration), zero point
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 Selection Automatic with ATC temperature probe
Temperature Probe Calibration 1 point temperature offset calibration
Channels 1
Display Type Graphic LCD with backlight
Backlight Option Yes, selectable
Keypad Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Measurement Modes Dissolved oxygen as % saturation or mg/L with temperature and barometric pressure
Stability Smart Stability and Smart Averaging
Data Management Details Transfer single, range or all data points to printer or computer
Data Points 1000 with date and time stamp
Log Function Type Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
Memory Non-volatile memory preserves data log, calibration log and meter settings
Alarm Output Calibration due alarm (fixed 12 hour)
Methods 10 per channel with password protection
Languages English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Inputs 9 pin MiniDIN (RDO optical or polarographic DO sensor with built-in temperature)
Outputs USB, RS232
Probe Type RDO optical dissolved oxygen probe, polarographic dissolved oxygen probe (purchase separately)
Power Supply 4 AA batteries (included) or universal AC adapter (sold separately)
AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Battery Life 800 hours
Battery Type Four AA (included)
IP Rating IP-67
Certifications/Compliance CE, TUV 3-1, FCC Class A
Operating Temperature 41° to 113°F (ambient)
5° to 45° C (ambient)
Relative Humidity Range 5 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.)
Weight 1.2 lb.
0.5kg
Percent Saturation Range (RDO) 0.0 to 500.0 % saturation
Percent Saturation Relative Accuracy (RDO) ±2 % saturation ≤ 200 % saturation, ±10 % saturation > 200 % saturation
Percent Saturation Resolution (RDO) 0.1, 1 % saturation
Warranty 3 year meter warranty