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Thermo Scientific™ Orion Star™ A223 Dissolved Oxygen Portable Meter

Reliably measure dissolved oxygen (optical / polarographic) and temperature with the Thermo Scientific™ Orion™ Star A223 RDO / DO Portable Meter for advanced field analysis

$1,383.55 - $2,784.62


AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Accuracy (Barometer) ±6mmHg
Accuracy (Polarographic DO) ±0.2mg/L or ±2% of reading, whichever is greater
Accuracy (RDO) ±0.1mg/L up to 8mg/L, ±0.2mg/L from 8 to 20mg/L, ±10% of reading up to 50mg/L
Accuracy (Temperature) ±0.1°C
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Catalog Number Mfr. No. Description Includes Price Quantity    


thermo scientific™
Orion Star A223 RDO/DO portable meter Star A223 RDO/DO meter, 4 AA batteries, literature CD, printed quick start guide, computer interface cable and meter test certificate Each for $1,383.55


thermo scientific™
Orion Star A223 RDO/DO portable meter kit with RDO optical DO sensor, meter armor and field case Each for $2,784.62
Description & Specifications


AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Accuracy (Barometer) ±6mmHg
Accuracy (Polarographic DO) ±0.2mg/L or ±2% of reading, whichever is greater
Accuracy (RDO) ±0.1mg/L up to 8mg/L, ±0.2mg/L from 8 to 20mg/L, ±10% of reading up to 50mg/L
Accuracy (Temperature) ±0.1°C
Alarm Output Calibration due alarm (fixed 12 hour)
Backlight Option Yes, selectable
Barometric Pressure Correction 400 to 850mmHg, automatic using built-in barometer or manual entry
Battery Life 800 hours
Battery Type Four AA (included)
Calibration Modes Water-saturated air, air-saturated water, manual (Winkler titration), zero point
Certifications/Compliance CE, TUV 3-1, FCC Class A
Channels 1
Data Management Details Transfer single, range or all data points to printer or computer
Data Points 1000 with date and time stamp
Display Type Graphic LCD with backlight
Dimensions (L x W x H) 24cm x 10cm x 6.5cm (9.5 in. x 3.9 in. x 2.6 in.)
IP Rating IP-67
Languages English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Log Function Type Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
Outputs USB, RS232
Range (Polarographic DO) 0.00 to 90.00mg/L
Range (RDO) 0.00 to 50.00mg/L
Sensor Types RDO optical dissolved oxygen sensor or polarographic dissolved oxygen sensor
Inputs 9 pin MiniDIN (RDO optical or polarographic DO sensor with built-in temperature)
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
Memory Non-volatile memory preserves data log, calibration log and meter settings
Methods 10 per channel with password protection
Model Orion Star A223 RDO Optical/Dissolved Oxygen/Temperature Portable Meter
Percent Saturation Range (Polarographic DO) 0.0 to 600.0 % saturation
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 (Polarographic DO) 0.1, 1 % saturation
Percent Saturation Resolution (RDO) 0.1, 1 % saturation
Power Supply 4 AA batteries (included) or universal AC adapter (sold separately)
Pressure Range 400 to 850mmHg
Pressure Resolution 1mmHg
Range (Temperature) 0.0 to 50.0 °C, 32.0 to 122.0 °F
Relative Humidity Range 5 to 85 %, non-condensing
Resolution (Polarographic DO) 0.01, 0.1mg/L
Resolution (RDO) 0.01, 0.1mg/L
Resolution (Temperature) 0.1°C, 0.1°F
Salinity Factor 0.0 to 45.0 ppt, automatic correction using manual entry of sample salinity
Temperature (English) Operating 41° to 113°F (ambient)
Temperature (Metric) Operating 5° to 45° C (ambient)
Temperature Probe Calibration 1 point temperature offset calibration
Temperature Selection Automatic with ATC temperature probe
Warranty 3 year meter warranty
Weight (English) 1.2 lb.
Weight (Metric) 0.5kg

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

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