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Dissolved Oxygen for Online Water Measurement Systems
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.
Online Dissolved Oxygen Measurements
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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