What is dissolved
oxygen? Where biology and
energy cost meet.
Dissolved oxygen is the amount of oxygen gas dissolved in water, measured in mg/L. A clear explanation of what it is, why it is vital for biological processes and aquatic life, and what a low reading is telling you.
Example readings for illustration purposes
What you can’t see
is already costing you.
Issues are flagged after damage is done, not before it starts. Every delayed alert is a cost you didn’t have to carry.
Manual records, missed checks, and audit gaps across sites. When an inspector asks for evidence, the scramble begins.
pH, chlorine, or turbidity can shift for days or weeks before anyone notices. Without real-time monitoring, you’re always reacting.
Continuous monitoring.
Instant alerts. Full audit trail.
Three connected layers that turn raw sensor data into actionable intelligence, automatically.
Connected sensors stream real-time data across all parameters, 24 hours a day. Cellular and LoRaWAN telemetry with encrypted payloads.
Threshold breaches trigger instant SMS, email, or app notifications. Escalation rules and role-based routing ensure the right person acts.
Cloud dashboards give your team the data, trendlines, and records they need, instantly. Every reading logged, every action auditable.
Every parameter.
One connected system.
From standard chemistry to full-spectrum UV-Vis sensing, AQUAIOT covers every dimension of water quality your operation demands.
Continuous acidity and alkalinity monitoring. Detect corrosion risk, Legionella-risk conditions, and treatment performance drift.
Detect particulate contamination, filter breakthrough, and process upsets in real time.
Continuous disinfection residual monitoring. Ensure treatment efficacy without manual sampling delays.
Monitor oxygen levels critical for biological process control, aeration efficiency, and environmental compliance.
Track dissolved mineral content and detect contamination events, cross-connections, or treatment changes in real time.
Specsens UV-Vis sensing at the edge. Detect organic load, humic substances, and complex contamination signatures beyond single-parameter sensors.
Detect apparent and true colour changes that may indicate natural organic matter, iron, manganese, or treatment by-products.
Oxidation-reduction potential monitoring for disinfection effectiveness, redox conditions, and process control in treatment and distribution.
Want the full technical specifications for every sensor?
Download DatasheetOxygen in the water is what keeps the biology alive.
Dissolved oxygen, often shortened to DO, is the quantity of oxygen gas dissolved in water and available to living organisms. It is usually reported in milligrams per litre, mg/L. Oxygen enters water from the atmosphere and from photosynthesis, and is consumed by respiration and by the breakdown of organic matter. The balance between supply and demand is what determines the dissolved oxygen level at any moment.
Dissolved oxygen is critical wherever biology drives water quality. In wastewater treatment it governs the health of the biological process and the efficiency of aeration, one of the largest energy costs on a site. In rivers and the environment, dissolved oxygen sustains fish and aquatic life, and a low reading is a recognised signal of biological stress, pollution or contamination ingress.
- Dissolved oxygen is oxygen gas dissolved in water, in mg/L
- Vital for aquatic life and for biological treatment processes
- Aeration adds oxygen and is a major energy cost in wastewater
- Low DO is an early signal of biological stress or contamination
Dissolved oxygen at a glance
Integrated monitoring systems,
not just sensors.
AQUAIOT combines connected sensors, cloud visibility, and engineering support into end-to-end deployments built around your infrastructure.
Integrated online monitoring system combining multiple sensing modalities, cloud telemetry, and dashboard connectivity in a single deployable unit.
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Versatile multi-parameter instrument supporting simultaneous measurement across key water quality indicators with flexible sensor configuration.
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Dedicated chlorine analysis with continuous free and total chlorine measurement, built for treatment, distribution, and compliance-relevant applications.
View productFrom sensor edge to
operations dashboard
Every AQUAIOT deployment is built for the operational realities of UK water and estates teams, retrofit-friendly, open to your existing systems, and supported by engineers who understand what you’re monitoring and why.
- Cellular + LoRaWAN telemetry with encrypted payloads
- Over-the-air configuration & firmware management
- RS485/Modbus · APIs for SCADA, AIMS/CAFM & analytics
- Role-based dashboards, trendlines, alarms & exports
- Exportable, audit-ready compliance records
Every reading. Every alert.
Every record. In one place.
Your monitoring data consolidated into a single cloud platform, built for operations, not just engineers.
Role-based cloud views with trendlines, threshold alarms, and multi-site visibility. Export data directly to your analytics stack.
Audit-ready trails generated automatically. Exportable logs and API integration with BMS, CAFM, and compliance platforms.
SMS, email, and app notifications with escalation rules and role-based routing. Your team is notified before issues escalate.
Over-the-air firmware updates and remote sensor configuration. Reduce site visits and keep systems current without disruption.
The engineering partner,
not just the hardware supplier.
AQUAIOT brings years of engineering experience alongside cutting-edge technology, so your deployment doesn’t end at the sensor.
Site survey, installation, commissioning, dashboard setup, training, and post-installation support. We see it through.
Clamp-on ultrasonic flow meters and non-invasive sensors. No pipework cutting, no service shutdown, no disruption to live systems.
RS485/Modbus, APIs, SCADA, AIMS/CAFM integration. Built to connect, not to lock you in to a closed ecosystem.
Hampshire-based team offering on-site and remote technical support. Real engineers, available when it matters.
Built for operational teams
who need to know.
Water quality monitoring isn’t one-size-fits-all. AQUAIOT deploys across the full range of UK water and estates operations.
Dissolved oxygen questions
What is dissolved oxygen in simple terms?
Why is dissolved oxygen important?
What does low dissolved oxygen indicate?
How is dissolved oxygen monitored continuously?
Go from learning to monitoring
Now you know what dissolved oxygen is, see how AQUAIOT monitors it in real time for process control and environmental insight.
Run your process
on real oxygen data.
Speak to an AQUAIOT engineer about continuous dissolved oxygen monitoring for your treatment or environmental sites. No commitment required.
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Download DatasheetReady to talk water quality? Speak to the AQUAIOT engineering team.