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Thermo Scientific™ Orion Star™ A223 Dissolved Oxygen Portable Meter

Reliably measure dissolved oxygen (optical/polarographic) and temperature with this RDO/DO portable meter for advanced field analysis.

$1302.00 - $2620.00


Measurement Modes Dissolved oxygen as % saturation or mg/L with temperature and barometric pressure
Sensor Types RDO optical dissolved oxygen sensor or polarographic dissolved oxygen sensor
Range (Polarographic DO) 0.00 to 90.00mg/L
Percent Saturation Range (Polarographic DO) 0.0 to 600.0 % saturation
Resolution (Polarographic DO) 0.01, 0.1mg/L
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Products 2
Catalog Number Mfr. No. Description Includes Price Quantity & Availability  
Catalog Number Mfr. No. Description Includes Price Quantity & Availability  
Accessories View Documents
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 $1,302.00
Add to cart
Accessories View Documents
Thermo Scientific™
Orion Star A223 RDO/DO portable meter kit with RDO optical DO sensor, meter armor and field case RDO optical DO sensor, meter armor and field case
Each for $2,620.00
Add to cart


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

Disclaimer to internal research use restriction: Any restrictions on the purchaser to utilize the product(s) for internal research purposes only does not apply to the product(s) on the web pages associated with this statement.



Dissolved oxygen as % saturation or mg/L with temperature and barometric pressure
0.00 to 90.00mg/L
0.01, 0.1mg/L
400 to 850mmHg
0.0°C to 50.0°C
1 point temperature offset calibration
Yes, selectable
1000 with date and time stamp
Transfer single, range or all data points to printer or computer
9 pin MiniDIN (RDO optical or polarographic DO sensor with built-in temperature)
CE, TUV 3-1, FCC Class A
Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
0.5 kg
5 to 85 %, non-condensing
0.0 to 600.0 % saturation
English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
0.00 to 50.00mg/L
Orion Star A223 RDO Optical/Dissolved Oxygen/Temperature Portable Meter
±2 % saturation ≤ 200 % saturation, ±10 % saturation > 200 % saturation
0.0 to 500.0 % saturation
0.1, 1 % saturation
0.01, 0.1mg/L
Smart Stability and Smart Averaging
5°C to 45°C (ambient)
Four AA (included)
RDO optical dissolved oxygen sensor or polarographic dissolved oxygen sensor
0.0 to 600.0 % saturation
±0.2mg/L or ±2% of reading, whichever is greater
Water-saturated air, air-saturated water, manual (Winkler titration), zero point
0.1°C (0.1°F)
Automatic with ATC temperature probe
Graphic LCD with Backlight
Non-volatile memory preserves data log, calibration log and meter settings
Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
Calibration due alarm (fixed 12 hour)
USB, RS232
24 cm x 10 cm x 6.5 cm (9.5 in. x 3.9 in. x 2.6 in.)
1.2 lb.
3 Year Meter Warranty
Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
±0.1mg/L up to 8mg/L, ±0.2mg/L from 8 to 20mg/L, ±10% of reading up to 50mg/L
10 per channel with password protection
400 to 850mmHg, automatic using built-in barometer or manual entry
0.1, 1 % saturation
±2 % saturation or ±2% of reading whichever is greater
4 AA batteries (included) or universal AC adapter (sold separately)
0.0 to 45.0 ppt, automatic correction using manual entry of sample salinity
41°F to 113°F (ambient)
800 hours
Product Certifications
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