ToolboxReal-Time MonitoringDissolved Oxygen Sensor

A solar-powered lake monitoring buoy floating beside a red marker float on a calm lake near the shoreline

Real-Time Monitoring

Dissolved Oxygen Sensor

Name: Dissolved Oxygen Sensor
Brand: Lake Pulse
Price: 1250.00 USD
Availability: InStock

Oxygen is what kills fish, and it does it at five in the morning when nobody is watching.

$1,250

Checkout arrives with the store connection. Orders attach to the lake on your account.

Overview

Oxygen is the variable that kills fish, and it does it overnight. A lake can be fine at 4 p.m. and lethal at 5 a.m., and nobody is on the water to see it.

Continuous optical DO with temperature, logging at fifteen-minute intervals and alerting when readings cross a threshold you set. Deployable at a single depth or on a multi-depth string to capture stratification and hypolimnetic oxygen loss through the season.

What's measured

2 parameters

What's measured for Dissolved Oxygen Sensor
Parameter	Unit	Reading interval
Dissolved oxygen	mg/L	Every 15 minutes
Water temperature	°F / °C	Every 15 minutes

Dissolved oxygen
Unit:
mg/L
Reading interval:
Every 15 minutes
Water temperature
Unit:
°F / °C
Reading interval:
Every 15 minutes

You get

Continuous readings streamed to your lake's Portal
Charts in the Analytics Hub and configurable alerts (Plus, Lake Admin, PRO)

How it's produced

Instrument: Optical dissolved oxygen sensor with integrated temperature; single depth or multi-depth string (string quoted separately)
Installed by: You, following the setup guide
Data transmission: Wi-Fi or base station

Product category

Physical ProductShips to you

Availability
Ships in 3 business days
Shipping
Flat-rate to your front door. Shipping details
SKU
LP-001-01

Example result

4.8 mg/L

Overnight low 3.9 mg/L at 5:10 am

Turnaround

Streams to your Portal continuously once deployed.

What problem does this solve for our lake?

A summer fish kill is almost never a mystery to a limnologist and almost always a mystery to the people who woke up to it. The mechanism is well understood: algae and plants produce oxygen through the day and consume it all night, and in a productive lake the pre-dawn minimum can fall below what fish can survive. By the time anyone is on the water, photosynthesis has restarted and the oxygen has recovered. The evidence is gone before breakfast.
A spot measurement taken during a site visit is therefore close to useless for this question. It samples the wrong hour. Continuous logging is the only way to capture the daily minimum, and the daily minimum is the number that determines whether your lake is habitable.
The second use is stratification. Through the summer, a deep lake separates into a warm surface layer and a cold bottom layer that no longer exchange. Oxygen in that bottom layer is consumed and not replaced, and when it reaches zero the sediment begins releasing phosphorus back into the water — internal loading, the reason so many lakes fail to improve after their watershed is cleaned up. Deployed on a multi-depth string, this sensor documents that process as it happens rather than inferring it afterward.

What's included?

Continuous optical dissolved oxygen sensor with integrated temperature
Logging at fifteen-minute intervals through the season
Threshold alerting, configured to a level you set
Single-depth deployment hardware; multi-depth string configuration available
Automatic data upload to the Lake Pulse Portal
Online dashboard viewable from phone or any device
Optical sensing membrane, which requires no electrolyte and no field calibration between seasons
Data flows up to the Lake Pulse cloud and back down into your lake's account, where it can be charted in the Analytics Hub, used to trigger alerts, and shared across your lake community

What's not included

Installation. Anchoring, mooring, or dock mounting is yours.
A dock, buoy, or fixed deployment point
The multi-depth string itself, which is quoted separately based on your lake's depth and thermocline
Water quality of any kind beyond oxygen and temperature
Nutrients, chlorophyll, or cyanobacteria. Oxygen tells you the consequence, not the cause.
Winter operation. Season use, removed before ice-in.
Aeration, circulation, or any intervention. This measures; it does not treat.
Treatment, remediation, or applicator services

Requirements

A deployment point at a location representative of the lake, ideally over the deep hole rather than in a shallow bay
Wi-Fi or base station coverage at the deployment site
The same position and depth each season, so year-over-year readings compare
Seasonal membrane inspection and cleaning; biofouling is the main cause of drift
Removal before ice-in
A Plus, Lake Admin, or PRO subscription. Syncing a real-time device to a Lake Pulse account requires one of these tiers.
Contact the Lake Pulse Boathouse if you have questions.

What you get back

Results

Continuous dissolved oxygen in mg/L with percent saturation, viewable from anywhere
The daily minimum, which a spot sample will never capture
Temperature at the same depth, so oxygen can be read against saturation rather than in isolation
Threshold alerts when readings cross a level you set, before a kill rather than after
On a multi-depth string, the seasonal development and breakdown of stratification and the onset of hypolimnetic anoxia
Data flows up to the Lake Pulse cloud and back down into your lake's account, where it can be charted in the Analytics Hub, used to trigger alerts, and shared across your lake community
Results are found in your lake's portal, accessible only to Plus, Lake Admin, and PRO subscription tiers

Pro tips

Set the alert at 5 mg/L, not at zero. Most warm-water fish are under stress well before the water is lethal, and the point of an alert is lead time.
Deploy over the deep hole. A sensor in a shallow bay measures the bay. The oxygen question that matters is what is happening at depth.
A single depth answers half the question. If internal loading is your concern, you need the bottom layer, and that means a string.
Watch the daily swing, not just the value. A lake oscillating six mg/L between afternoon and dawn is telling you it is heavily productive, regardless of where the average sits.
Biofouling is the failure mode. A membrane left uncleaned through a productive August will read low, and low readings are the ones you are least likely to question.
Pair it with chlorophyll-a and total phosphorus. Oxygen is the symptom. Those two are the explanation, and a board approving a budget will want both.
Take it in before ice. It is the most common way an expensive sensor becomes an expensive lesson.

Results sync to the Portal for Plus, Lake Admin, and PRO subscribers

Results from this product land in your lake's shared record in the Portal — next to everything else your lake has ever measured, instead of in an inbox.

Compare subscriptions

About these results

Every reading is time-stamped as it is recorded. Readings come from one sensor at one location and depth; conditions elsewhere in the lake can differ, sometimes sharply and within hours. Sensors drift, foul, and occasionally fail, and readings between maintenance and calibration visits may be affected. Gaps in the record are shown as gaps, never filled in. Sensor values are field measurements, not laboratory analyses. Alerts are notifications of a reading, not a safety determination. Results can help you make decisions about safe swimming and water use, but no result is definitive for every place and time. It is always good practice to check posted signs and your state or local health authorities.

Questions on this?

Our team can help you choose the right solution for your lake, explain how results sync to your Portal, or point you to the right subscription.

Same aisle