Dissolved oxygen (DO) is essential to some processes and a damaging threat to others. Yet for all, compliance is top of mind. With so much at stake, don’t take DO measuring technologies for granted. Trust in Thermo Scientific for a higher standard.
Crafted with far-reaching DO measuring expertise, our Orion and AquaSensors DO measuring tools offer precision and accuracy to achieve your unique goals.
Choice of galvanic or optical sensors, with high-performing accuracy across multiple ranges.
High-performance Thermo Scientific AquaSensors and Orion sensors provide highly sensitive dissolved oxygen measurements across your facility. Optical-based sensors are insensitive to pressure spikes and do not require a flow rate, while galvanic-based sensors offer real-time measurements without the risk of digital noise. For control, look to our plug-and-play, fully configurable DataStick online sensors to increase efficiency and confidence while saving time, resources, and money.
| Aqua Sensors AnalogPlus Sensor | Aqua Sensors; DataStick Sensor | Aqua Sensors; AquaTrace | AquaSensors; RDO Pro-X Sensor | Orion Low-Level Analyzer | |
|---|---|---|---|---|---|---|
 |  |  |  |  | ||
| Key Features | Polarographic sensor for demanding process applications | Polarographic sensor for demanding process applications, precalibrated sensor head with digital communications capability | Trace level DO sensor with precalibrated sensor head and digital communications capability | Rugged, membraneless, l uminescent dissolved oxygen sensor (Optical DO sensor) | ||
| Measurement Specifications | Accuracy | 1% of the reading | +/-1 ppb or+/-2% upto 20ppb; +/-5% for >20ppb | +/-0.1ppm <8.0ppm; +/-0.2ppm >8.0ppm | 0.1μg/L to 9,999μg/L | |
| Measuring range(s) | 0-40ppm | 0-40ppm / 0-200% Saturation | 30ppb to 20ppm | 0.00 to 20ppm | ||
| Resolution format | xx.xx | xx.xx | xxxx.x | xx.xx | ||
| Sensor specific details | PEEK sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT,Integrated temperature sensor | PEEK/CPVC/Stainless steel sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT , Integrated temperature sensor, Modbus RTU/ Ethernet / USB bui-in communications Hazardous classification: Class 1, Division 2, Groups A, B, C, D @ 50°C | Municipal and industrial wastewater–Aeration tanks–Aerobic digesters–Plant effluent monitoring (NPDES permit holders)–Anaerobic digestersBoiler feed water (ppb)• Pharmaceutical (ppb)• Semiconductor manufacturing (ppb)• Ultrapure water (ppb)• Power plants (ppb) | Delrin and Polystyrene sensor head, Sensor cap, O-ring,1.25" NPT , Ibntegrated temperature sensor, IP68 ingress protection with cap installed. Modbus RTU built in communications. | Dissolved Oxygen: ± 2% reading or 2 digits Temperature: ± 0.1°C | |
| Applications | Water production • Reverse osmosis filters • Food processing • Pharmaceutical • Desalination • Deionization • Ultrafiltration • Distilled water • Semi-conductor • Steam Condensate return–Boiler blowdown–Cooling towers–Leak detection in heat exchangers–Demineralizers | Municipal and industrial wastewater–Aeration tanks–Aerobic digesters–Plant effluent monitoring (NPDES permit holders)–Anaerobic digestersBoiler feed water (ppb)• Pharmaceutical (ppb)• Semiconductor manufacturing (ppb)• Ultrapure water (ppb)• Power plants (ppb) | Process water,Production and distribution • Food and beverage–Monitor process water quality• Pure water | Municipal and industrial wastewater - Aeration tanks - Aerobic digesters - Plant effluent monitoring (NPDES permit holders) - Anaerobic digesters • Aquaculture • Brewing • Fermentation • Bio-processing • Many applications across chemical process, food and dairy, pulp and paper. | Boiler feed water, ultra pure water, process steam | |
| Associated Contoller/Transmitter | • Aquapro • AV88 | • Can be connected directly to DCS/PLC • Aquapro • AV38 | ||||
| Mounting Accessories & Options | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, air purge wash adapter-CPVC | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, flow chamber with PVDF/SS 316 mounting plate, air purge wash adapter-CPVC | Acrylic/ 316SS flow chamber with ¼” tube fittings for process inlet and outlet (Mandatory Part of the measuring system) | Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, air purge wash adapter-CPVC | Dissolved Oxygen: ± 2% reading or 0.1 μg/L Temperature: ±0.1°Cr | |
| Catalog # | Quote | Quote | Quote | Order | Quote | |
| Aqua Sensors; AnalogPlus Sensor | Aqua Sensors; DataStick Sensor | ||
|---|---|---|---|
| IMAGE | |||
| Key Features | Polarographic sensor for demanding process applications | Polarographic sensor for demanding process applications, precalibrated sensor head with digital communications capability | |
| Measurement Specifications | Accuracy | 2% of the reading | |
| Measuring range(s) | 0-10ppm | 0 to 10ppm | |
| Resolution format | xx.xx | xx.xx | |
| Sensor specific details | PEEK sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT,Integrated temperature sensor | PEEK/CPVC/Stainless steel sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT , Integrated temperature sensor, Modbus RTU/ Ethernet / USB bui-in communications Hazardous classification: Class 1, Division 2, Groups A, B, C, D @ 50°C | |
| Applications | Drinking water treatment • Wastewater treatment • Food and beverage sanitization • Bottled water production • Packaged water systems • Pulp and paper bleaching • Pharmaceutical • Cooling water • Semiconductor wash water | Drinking water treatment • Wastewater treatment • Food and beverage sanitization • Bottled water production • Packaged water systems • Pulp and paper bleaching • Pharmaceutical • Cooling water • Semiconductor wash water tower heat exchangers Demineralizers | |
| Associated Contoller/Transmitter | • Aquapro • AV88 | Can be connected directly to DCS/PLC • Aquapro • AV38 | |
| Mounting Accessories & Options | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, flow chamber with PVDF/SS 316 mounting plate. | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, flow chamber with PVDF/SS 316 mounting plate, air purge wash adapter-CPVC | |
| Catalog # | Quote | Order | |
| Aqua Sensors AnalogPlus Sensor | Aqua Sensors; DataStick Sensor | Aqua Sensors; AquaTrace | AquaSensors; RDO Pro-X Sensor | Orion Low-Level Analyzer | |
|---|---|---|---|---|---|---|
| | | | | ||
| Key Features | Polarographic sensor for demanding process applications | Polarographic sensor for demanding process applications, precalibrated sensor head with digital communications capability | Trace level DO sensor with precalibrated sensor head and digital communications capability | Rugged, membraneless, l uminescent dissolved oxygen sensor (Optical DO sensor) | ||
| Measurement Specifications | Accuracy | 1% of the reading | +/-1 ppb or+/-2% upto 20ppb; +/-5% for >20ppb | +/-0.1ppm <8.0ppm; +/-0.2ppm >8.0ppm | 0.1μg/L to 9,999μg/L | |
| Measuring range(s) | 0-40ppm | 0-40ppm / 0-200% Saturation | 30ppb to 20ppm | 0.00 to 20ppm | ||
| Resolution format | xx.xx | xx.xx | xxxx.x | xx.xx | ||
| Sensor specific details | PEEK sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT,Integrated temperature sensor | PEEK/CPVC/Stainless steel sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT , Integrated temperature sensor, Modbus RTU/ Ethernet / USB bui-in communications Hazardous classification: Class 1, Division 2, Groups A, B, C, D @ 50°C | Municipal and industrial wastewater–Aeration tanks–Aerobic digesters–Plant effluent monitoring (NPDES permit holders)–Anaerobic digestersBoiler feed water (ppb)• Pharmaceutical (ppb)• Semiconductor manufacturing (ppb)• Ultrapure water (ppb)• Power plants (ppb) | Delrin and Polystyrene sensor head, Sensor cap, O-ring,1.25" NPT , Ibntegrated temperature sensor, IP68 ingress protection with cap installed. Modbus RTU built in communications. | Dissolved Oxygen: ± 2% reading or 2 digits Temperature: ± 0.1°C | |
| Applications | Water production • Reverse osmosis filters • Food processing • Pharmaceutical • Desalination • Deionization • Ultrafiltration • Distilled water • Semi-conductor • Steam Condensate return–Boiler blowdown–Cooling towers–Leak detection in heat exchangers–Demineralizers | Municipal and industrial wastewater–Aeration tanks–Aerobic digesters–Plant effluent monitoring (NPDES permit holders)–Anaerobic digestersBoiler feed water (ppb)• Pharmaceutical (ppb)• Semiconductor manufacturing (ppb)• Ultrapure water (ppb)• Power plants (ppb) | Process water,Production and distribution • Food and beverage–Monitor process water quality• Pure water | Municipal and industrial wastewater - Aeration tanks - Aerobic digesters - Plant effluent monitoring (NPDES permit holders) - Anaerobic digesters • Aquaculture • Brewing • Fermentation • Bio-processing • Many applications across chemical process, food and dairy, pulp and paper. | Boiler feed water, ultra pure water, process steam | |
| Associated Contoller/Transmitter | • Aquapro • AV88 | • Can be connected directly to DCS/PLC • Aquapro • AV38 | ||||
| Mounting Accessories & Options | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, air purge wash adapter-CPVC | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, flow chamber with PVDF/SS 316 mounting plate, air purge wash adapter-CPVC | Acrylic/ 316SS flow chamber with ¼” tube fittings for process inlet and outlet (Mandatory Part of the measuring system) | Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, air purge wash adapter-CPVC | Dissolved Oxygen: ± 2% reading or 0.1 μg/L Temperature: ±0.1°Cr | |
| Catalog # | Quote | Quote | Quote | Order | Quote | |
| Aqua Sensors; AnalogPlus Sensor | Aqua Sensors; DataStick Sensor | ||
|---|---|---|---|
| IMAGE | |||
| Key Features | Polarographic sensor for demanding process applications | Polarographic sensor for demanding process applications, precalibrated sensor head with digital communications capability | |
| Measurement Specifications | Accuracy | 2% of the reading | |
| Measuring range(s) | 0-10ppm | 0 to 10ppm | |
| Resolution format | xx.xx | xx.xx | |
| Sensor specific details | PEEK sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT,Integrated temperature sensor | PEEK/CPVC/Stainless steel sensor head, Viton -O- ring, FEP membrane for Dissolved Oxygen , PTFE membrane for Ozone, Gold cathode, silver anode and silver reference electrode, 1"NPT , Integrated temperature sensor, Modbus RTU/ Ethernet / USB bui-in communications Hazardous classification: Class 1, Division 2, Groups A, B, C, D @ 50°C | |
| Applications | Drinking water treatment • Wastewater treatment • Food and beverage sanitization • Bottled water production • Packaged water systems • Pulp and paper bleaching • Pharmaceutical • Cooling water • Semiconductor wash water | Drinking water treatment • Wastewater treatment • Food and beverage sanitization • Bottled water production • Packaged water systems • Pulp and paper bleaching • Pharmaceutical • Cooling water • Semiconductor wash water tower heat exchangers Demineralizers | |
| Associated Contoller/Transmitter | • Aquapro • AV88 | Can be connected directly to DCS/PLC • Aquapro • AV38 | |
| Mounting Accessories & Options | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, flow chamber with PVDF/SS 316 mounting plate. | 1", 1-1/2", Tee, Union & ball valve SS 316 & CPVC fittings, Immersion mounting with hand rail swivel mounting and PVC junction box, ball float assembly, flow chamber with PVDF/SS 316 mounting plate, air purge wash adapter-CPVC | |
| Catalog # | Quote | Order | |
| AV38 | AV88 | AquaPro | Orion 2100 Series | Alpha 2000 Series* |
|---|---|---|---|---|---|
| Input sensor type | Digital (Data stick version) | Analog via the personality module | Digital (Data stick version) / Analog | Analog version only | Analog version only |
| Channels | Two sensors for MODBUS | One sensor | Upto 4 Sensors | Upto 2 Sensors | One sensor |
| Supported sensors | • pH • ORP • Conductivity • Dissolved oxygen • Dissolved ozone • Turbidity • Suspended solids • With automatic temperature compensation (ATC) wherever applicable | • pH • ORP • Conductivity (includes resistivity, concentration, salinity and TDS) • Dissolved oxygen • Dissolved ozone • Turbidity • Suspended solids • With automatic temperature compensation (ATC) wherever applicable | • pH • ORP • Conductivity (includes resistivity, concentration, salinity and TDS) • Sodium • Flouride • Chloride • Calcium Hardness, Oxygen Scavenger, Ammonia • With automatic temperature compensation (ATC) wherever applicable | • pH • ORP • Conductivity • Dissolved Oxygen • With automatic temperature compensation (ATC) wherever applicable. | |
| Outputs | • 4-20mA active - 2 • Relay ouputs - 2; 1.0 Amp, dry contacts | • 0/4-20mA active - up to 8 • Relay ouputs - 3 (up to 6); 5.0 Amp, dry contacts • Outputs can be used for basic PID • Optional: MODBUS RTU • MODBUS RS 232 DeviceNet • Ethernet/IP • CANopen | • 0/4-20mA active - 4 • Relay ouputs - 3; 5.0 Amp, dry contacts • Optional: MODBUS RTU | • 0/4-20mA active - 2 • Relay ouputs - 2; 3.0 Amp, dry contacts • Wash relay -1 • Hold relay -1 • Alarm relay -1 • Relays can be used for P/PI controller | |
| Input Power supply | • 10 to 30 VDC • Optional or 100 to 240 VAC | • 10 to 30 VDC • Optional or 100 to 240 VAC | • 24 VDC • Optional or 100 to 240 VAC | • 100 to 120 VAC and 200 to 240 VAC | • 80 to 250 VAC |
| User interface | 2 line by 16 character back lit LCD display with keys for menu navigation | 2 line by 16 character back lit LCD display keys for menu navigation | • Display: 4.3 Inch color graphics with high contrast • 7 Key menu navigation • USB • Multiple languages | Large bright backlit LCD provides a 3 line parameter display | • Backlit 14 segments display with symbols for status information, with keys for menu navigation • On/Off selectable with four levels of brightness control |
| Enclosure type | • NEMA 4X • Wall mount • Panel mount ¼ DIN • Panel mount ½ DIN | • Wall mount; NEMA 4X • Panel mount: ¼ NEMA 4X • Panel mount ½ DIN NEMA 4X | • NEMA 4X • Pipe mount• Panel mount • Wall mount • UV resistant poly carbonate | • NEMA 4X • ½ DIN panel mount • Pipe mount | • NEMA 4X • ½ DIN panel mount • Pipe mount wall mount |
| Catalog # | Quote | Quote | Quote | Order | Order |
*Only available in North America
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