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Thermo Scientific™ Orion Star™ A329 pH/ISE/Conductivity/Dissolved Oxygen Portable Multiparameter Meter

Accurately measure pH, ion concentration, conductivity, dissolved oxygen and temperature with the Thermo Scientific™ Orion™ Star A329 pH/ISE/Conductivity/RDO/DO Portable Meter

$2,865.27 - $5,155.40


AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Accuracy (Barometer) ±6mmHg
Accuracy (Conductivity) 0.5% of reading ±1 digit > 3 μS; 0.5% of reading ±0.01 μS ≤ 3 μS
Accuracy (ISE) ±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (mV) ±0.2 mV or ±0.05% of reading whichever is greater
View More Specs
Catalog Number Mfr. No. Description Includes Price Quantity    


thermo scientific™
Orion Star A329 pH/ISE/conductivity/RDO/DO portable meter Star A329 pH/ISE/conductivity/RDO/DO meter, 4 AA batteries, literature CD, printed quick start guide, computer interface cable and meter test certificate Each for $2,865.27


thermo scientific™
Orion Star A329 pH/ISE/conductivity/RDO/DO portable meter kit with ROSS Ultra Triode low maintenance gel pH/ATC electrode, DuraProbe 4-cell conductivity sensor, RDO optical DO sensor, solutions, meter armor and field case Star A329 pH/ISE/Conductivity/RDO/DO Meter with Batteries; 8107UWMMD ROSS Gel-filled Epoxy pH/ATC Triode with 3 Meter Cable; 013010MD DuraProbe Epoxy 4-Probe (K=0.475) Conductivity Probe with 3 Meter Cable; 087010MD RDO Optical DO Probe with 3 Meter Cable Each for $5,155.40
Description & Specifications


AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Accuracy (Barometer) ±6mmHg
Accuracy (Conductivity) 0.5% of reading ±1 digit > 3 μS; 0.5% of reading ±0.01 μS ≤ 3 μS
Accuracy (ISE) ±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (mV) ±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (pH) ±0.002pH
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 (Resistivity) 0.5% of reading ±1 digit
Accuracy (Salinity) 0.5% of reading ±1 digit
Accuracy (TDS) 0.5% of reading ±1 digit
Accuracy (Temperature) ±0.1°C
Advanced ISE Functions Segmented (point-to-point) slope, non-linear selectable auto-blank, low concentration range stability
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 pH with calibration editing option, ion concentration (ISE) with calibration editing option, relative mV (RmV), ORP, conductivity with calibration editing option, dissolved oxygen and temperature
Calibration Modes Water-saturated air, air-saturated water, manual (Winkler titration), zero point
Calibration Points 1 point relative mV (RmV) mode, 1 point ORP mode
Calibration Points (ISE) 1 to 5
Calibration Points (pH) 1 to 5
Cell Constant 0.001 to 199.9cm-1
Certifications/Compliance CE, TUV 3-1, FCC Class A
Channels 3
Data Management Details Transfer single, range or all data points to printer or computer
Calibration Points (Conductivity) Up to 5
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 (Conductivity) 0.001 µS/cm to 3000 mS/cm
Range (ISE) 0.0001 to 19900 with selectable units of ppm, Molar, mg/L, %, ppb or none
Range (mV) ±2000.0mV
Range (pH) -2.000 to 20.000pH
Range (Polarographic DO) 0.00 to 90.00mg/L
Range (RDO) 0.00 to 50.00mg/L
Range (Resistivity) 2 ohm to 100.0 meg-ohm
Range (Salinity) 0.06 to 80.00 psu, 0.05 to 42.00 ppt
Range (TDS) 0.001 to 200.0 ppm
Resolution (pH) 0.1, 0.01, 0.001pH
Inputs BNC (pH or ORP electrode), pin-tip (reference electrode), 8 pin MiniDIN (conductivity sensor with built-in temperature or ATC temperature probe), 9 pin MiniDIN (RDO optical or polarographic DO sensor with built-in temperature)
Isopotential Point 7.000pH
Keypad Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Methods 10 per channel with password protection
Model Orion Star A329 pH/ISE/mV/RmV/ORP/Conductivity/TDS/Salinity/Resistivity/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 (ORP) ±2000.0mV
Range (Relative mV) ±2000.0mV
Range (Temperature) -5.0° to 105.0° C, 22.0° to 221.0° F
Relative Humidity Range 5 to 85 %, non-condensing
Resolution (Conductivity) 0.001 μS minimum, auto ranging up to 4 significant digits
Resolution (ISE) 0.0001 minimum, 1 to 3 significant digits (user selectable)
Resolution (mV) 0.1mV
Resolution (Polarographic DO) 0.01, 0.1mg/L
Resolution (RDO) 0.01, 0.1mg/L
Resolution (Resistivity) 1 ohm or 0.1 meg-ohm, auto ranging
Resolution (Salinity) 0.01 psu or 0.01 ppt minimum, auto ranging
Resolution (TDS) 0.001 ppm minimum, auto ranging up to 4 significant digits
Resolution (Temperature) 0.1°C, 0.1°F
Salinity Factor 0.0 to 45.0 ppt, automatic correction using conductivity reading or manual entry of sample salinity
Salinity Measurement Modes Practical salinity (psu) or natural sea water (ppt)
Stability Selectable fast, medium, slow or Smart Stability setting; Selectable off or Automatic Smart averaging setting
TDS Factor Range Linear (0.02 to 9.99)
Temperature Compensation Linear, nLFn (non-linear ultra pure water), nLFu (non-linear ultra pure degassed water), EP (off with warning) or off
Temperature (English) Operating 41° to 113°F (ambient)
Temperature (Metric) Operating 5° to 45° C (ambient)
Temperature (Metric) Reference 5, 10, 15, 20, 25°C
Temperature Probe Calibration 1 point temperature offset calibration
Temperature Selection Manual or 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 A329 pH, ISE, Conductivity, DO and RDO Portable Meter, designed for a wide range of pH, ion concentration, conductivity, dissolved oxygen and temperature testing and field applications. Evaluate samples in the most demanding locations using this waterproof meter with IP67-rated housing. Use the three channels to measure pH, conductivity and DO simultaneously or view each channel separately. Log up to 5000 data point sets with time / date stamp and transfer to a printer or computer.

Take your measurements at the source with our premium line of portable meters. The Thermo Scientific Orion Star A329 pH/ISE/conductivity/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 A329 pH/ISE/conductivity/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. 
  • Combined convenience with the benefits of a pH/ISE meter, conductivity meter and dissolved oxygen meter in one easy-to-use system
  • Measure pH, ion concentration, mV, relative mV or ORP with temperature on channel one; measure conductivity, TDS, salinity or resistivity with temperature on channel two; and measure dissolved oxygen in percent saturation or mg/L with temperature using RDO optical DO probes or polarographic DO probes on channel three
  • Easily view individual measurements on a full screen display and quickly toggle to a split screen display to view multiple measurements simultaneously
  • Perform up to five point pH and ISE calibrations with calibration editing option that allows individual points to be fixed without a full recalibration
  • Perform up to a five point conductivity calibration
  • Auto-ranging conductivity values offer consistent readings across entire measurement range without need to recalibrate
  • Use linear, non-linear, EP (USP) or off conductivity temperature compensation with 5, 10, 15, 20 or 25°C reference temperatures
  • 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 5000 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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