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Thermo Scientific™ Orion Star™ A323 Dissolved Oxygen Portable Meter

Accurately monitor dissolved oxygen (optical / polarographic) and temperature with the Thermo Scientific™ Orion™ Star A323 RDO / DO Portable Meter for challenging field testing

$1,686.91 - $2,963.47


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 A323 RDO/DO portable meter Star A323 RDO/DO meter, 4 AA batteries, literature CD, printed quick start guide, computer interface cable and meter test certificate Each for $1,686.91


thermo scientific™
Orion Star A323 RDO/DO portable meter kit with RDO optical DO sensor, meter armor and field case Each for $2,963.47
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 High/low limit alarm, calibration due alarm
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 5000 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 and Timed measure modes; 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 A323 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

Get high accuracy and premium performance everywhere you need it with the Thermo Scientific™ Orion™ Star A323 Dissolved Oxygen and RDO Portable Meter, designed for a wide range of dissolved oxygen and temperature testing and field applications. Evaluate samples in the most demanding locations using this waterproof meter with IP67-rated housing. Use an RDO optical or polarographic DO probe and calibrate using water-saturated air, air-saturated water, custom value (Winkler) or zero point. Log up to 5000 data point sets with time / date stamp and easily transfer logs to a printer or computer.

Take your measurements at the source with our premium line of portable meters. The Thermo Scientific Orion Star A323 RDO/DO portable meter offers an information-rich screen and user-friendly operation. This rugged, waterproof portable meter is ready to tackle the elements with you. Orion Star A323 RDO/DO portable meters are designed to be easy to use, dependable field meters that offer advanced features and functions including a 5000 point date log with sample ID and user ID options, calibration and high/low limit alarms and password-protected measurement methods. 
  • 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, Continuous shows changing readings with hold option and Timed logs data at specific intervals
  • Data log collects and date/time stamps up to 5,000 measurement sets with optional sample ID and user ID
  • Calibration log stores ten most recent calibrations
  • 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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