Water Quality Sampling

Kor Mobile App for ProDSS | Overview

Wed, 10 Dec 2025 16:41:21 GMT

The Kor Mobile app, now available for ProDSS, offers a convenient way to interface with your ProDSS cable and sensors. View live data, calibrate, manage sites, and share data with the app and KorLink.

Mission Water Issue 11

Tue, 24 Jun 2025 07:24:43 GMT

Mission: Water Issue 11 is available.

Get 64 pages of content where stories and science converge!

Read five articles covering water monitoring challenges from Florida to Norway to Australia!

Catch up on news, including innovative water conservation efforts from around the world!

Learn about environmental advocates who are working to solve our biggest water challenges!

Cómo reemplazar una membrana de tapa de oxígeno disuelto YSI

Wed, 04 Dec 2024 10:15:04 GMT

En este video, les ensenaremos como instalar una membrana nueva con solución electrolítica en su sensor de oxigeno disuelto Pro Series.

Cómo calibrar el medidor de oxígeno disuelto YSI Pro20

Wed, 04 Dec 2024 10:13:38 GMT

En este video, cubriremos la función Calibración de un Solo Toque en el instrumento Pro20, medidor de oxígeno disuelto de mano.

How to Calibrate the YSI Pro20 Dissolved Oxygen Meter

Wed, 04 Dec 2024 10:11:21 GMT

In this video we’ll cover the One-Touch Calibration feature for the Pro20 Dissolved Oxygen meter.  

How to Replace a YSI Dissolved Oxygen Cap Membrane

Wed, 04 Dec 2024 10:02:11 GMT

In this video, we’ll show you how to install a membrane covered dissolved oxygen cap on your Pro Series DO sensor.

Selecting Your YSI Pro Series Water Quality System

Tue, 03 Dec 2024 13:47:15 GMT

There are five important factors you'll want to consider to select the right YSI Pro Series portable water quality handheld system for your application.

Pro Series handhelds are rugged and waterproof with tough, military-spec connectors and user-replaceable cables and sensors.

They are field-tested and provide trusted data.

YSI ProDSS or EXO Multiparameter Water Quality Instruments

Wed, 11 Sep 2024 09:17:10 GMT

Comparing YSI's top water quality platforms: ProDSS Handhelds and EXO Sondes. Which one is right for you?

We get a lot of questions about the best multiparameter water quality instrument for specific applications. The choice often depends on whether you’ll be spot sampling or continuous monitoring. In this video, we cover the differences and similarities to consider so you can make the best choice for your monitoring program.

Flow Probe | Features & Benefits | Global Water

Tue, 09 Jan 2024 09:10:09 GMT

Hello. I'm Insley, a product manager for Xylem Analytics. In this video, I will be reviewing the features of the Global Water Flow Probe. The Flow Probe is a rugged and easy-to-use instrument for measuring the average water velocity in streams, rivers, and open channels. It includes a propeller sensor, an aluminum telescoping handle with a staff gauge, a display unit, and a lithium battery that lasts up to five years. The Flow Probe display unit is self-contained and sealed, designed for use in harsh outdoor environments. It is shock-resistant and will float if dropped during use.

The propeller is protected inside a 2-inch diameter housing. This design keeps debris from clogging the propeller, helping avoid interruptions in your sampling day. If the propeller needs to be cleaned, it can be easily removed, cleaned, and replaced onto the Flow Probe. The Flow Probe's display shows the instantaneous and average velocities detected by the propeller in feet or meters per second. The display can also show the minimum or maximum velocity and a timer indicating how long measurements are taken.

You can store up to 30 sets of data points on the Flow Probe for review later. It is important to remember that stream flow velocity can vary throughout the flow's cross-section because of friction between the water and the substrate, surges in velocity, turbulence, and large obstructions. To account for this, the Flow Probe can be moved slowly and smoothly through the water during average velocity measurements. For larger streams and rivers, the cross-sectional area can be divided into subsections, about 1 to 3 feet wide, and a vertical flow profile can be obtained.

The telescoping handle makes monitoring from a boat, bridge, or deeper water easy. The Flow Probe can be deployed in as shallow as 2 inches of water and has an accuracy of 0.1 feet per second in water with a velocity between 0.3 and 20 feet per second. With a floating, watertight display unit, a simple, rugged design, and ease of use, the Global Water Flow Probe is ideal for water velocity field studies. If you'd like to find out more, please visit ysi.com/flow-probe..

YSI ProODO vs ProSolo Handheld Meters

Mon, 31 Jul 2023 10:33:01 GMT

In this video, We'll cover the main reasons why the ProSolo is a perfect replacement for your ProODO field meter. As a reminder, the ProODO has been discontinued.

The ProSolo advances our goal of providing reliable and accurate dissolved oxygen instrumentation for water professionals everywhere.

How to Select a Handheld Dissolved Oxygen Meter

Mon, 31 Jul 2023 10:29:55 GMT

In this video, we will guide you through selecting a portable dissolved oxygen meter for field use. There are five factors to consider when choosing an instrument to meet your application needs.

Clean Water Act Celebration | Tour Overview

Mon, 22 Aug 2022 07:48:43 GMT

YSI ProQuatro vs ProDSS | Key Differences to Consider

Tue, 17 May 2022 07:35:02 GMT

These multiparameter instruments provide high-quality data in a variety of applications from rivers and streams to groundwater, aquaculture, and anywhere else your monitoring takes you. Smart features, including a built-in USB port and an intuitive user interface, make data collection easy and convenient.

As with all YSI Pro series instruments, the ProQuatro and ProDSS are built with field use in mind. They are rugged, waterproof, and even float if they're dropped in the water.

Both handhelds use field-replaceable sensors and cables to keep your instrument up and running and include an industry-leading three-year warranty (on the handheld).

These portable instruments have low power consumption to maximize your time in the field, and the rechargeable battery of the ProDSS eliminates battery waste and lowers the cost of ownership.

The major differences between these handhelds involve 1) cable selection, 2) sensor technology, and 3) the available parameters.

The ProQuatro and ProDSS are highly customizable, with multiparameter four-port cables and a variety of lengths. The universal sensor ports of the ProDSS cable accept any combination of digital smart sensors, giving you full control of your measurement options.

An additional benefit for ProDSS is that the four-port cable is available in lengths of up to 100 meters, while the ProQuatro is limited to 30 meters.

The ProQuatro uses tried and true sensor technology to provide fast and reliable measurements for 13 major parameters, including dissolved oxygen, conductivity, pH, ORP, and temperature.

The ProDSS can measure all of these parameters and more including turbidity, total algae, depth, and GPS. Additional optical sensors provide greater stability and data accuracy in the field. Choose from 21 parameter options to create your perfect system.

Digital smart sensors are automatically recognized by the ProDSS for fast, easy setup, and also store their own calibration data. ProDSS sensors are built with durable titanium to last longer even in harsh field conditions.

Both instruments feature a large internal memory and an on-the-go USB port for transferring data to a flash drive. ProDSS offers 20 times more internal memory than ProQuatro and allows direct connection to a PC using YSI's Kor software. This makes it easy to view recorded data, calibrate sensors and ensure equipment is operating at peak performance.

These handhelds are easy to operate with a menu-driven interface and convenient keypad to quickly navigate the most common features. Readings can be easily viewed on the large backlit display screen even while wearing polarized glasses.

ProDSS takes this even further with a full-color display and on-screen graphing capabilities for viewing sensor stabilization or logged data.

While both instruments are powerful, the ProDSS offers superior functionality and additional measurement capabilities that distinguish it as the ultimate sampling handheld.

No matter which instrument you choose, the YSI professional series sets the standard for water quality sampling.

You can learn more about these instruments and our full range of options at ysi.com/proseries.

See which Pro Series instrument is right for you. Pro Series Product Selector.

Introducing ODO RTU

Thu, 01 Jul 2021 08:31:43 GMT

With the new ODO RTU, there’s an easy way to install YSI’s industry-leading optical dissolved oxygen technology at your site, tank, or pond. Engineered specifically for aquaculture, but at home in any Modbus system, this ODO sensor can be used to monitor oxygen levels for your livestock for improved energy efficiency, reduced costs, less maintenance, and – most importantly – better data.

5 Reasons to Upgrade from Pro Plus to ProQuatro

Wed, 24 Feb 2021 09:38:06 GMT

Since 2006, the Professional Plus has set the industry standard for water quality sampling, but the time has come for us to say farewell and move toward the future. Now, as the 2021 field season approaches, we are excited to crown the ProQuatro, YSI’s latest handheld in the Professional Series line, as the new successor to the Pro Plus throne.

Why Monitor for Algae

Mon, 17 Aug 2020 08:43:28 GMT

ALGAE

Let's talk about why people monitor for algae.

The amount and type of algae can tell you a lot about the health of that system. But first, let’s cover what we’re referring to as algae. In simple terms, algae are photosynthetic organisms like plants. We can separate out the macroalgae, such as the red, brown, and green algae – sometimes referred to as seaweeds. Let’s instead focus on the microalgae, or single-celled algae.

Prokaryotes like blue-green algae lack a nucleus. This technically makes them photosynthetic bacteria, but they are still important to this discussion. There are also the eukaryotes like those that cause red and brown tides.

One thing all of these microalgae have in common is that you can find them in both freshwater and marine environments.

One major reason to monitor for algae is aquatic ecology research. This includes primary productivity like photosynthesis, system health and dynamics, and an interest in the types and abundance of algae in a system.

But the big reason for monitoring algae these days is source water protection and concerns over drinking water safety. Most states in the U.S. are dealing with Harmful Algal Blooms. These can range from cyanobacteria in the Great Lakes to red tides in Florida and the Gulf Coast. These blooms cause severe impacts on residents and local wildlife. From coast to coast, there is a need for algae monitoring.

So why do we monitor for algae? Scientists might be interested in how a body of water switches over from what we sometimes call healthy algae, like diatoms, to unhealthy algae like the blue-greens. A treatment plant operator or drinking water manager would be more concerned if the product they’re delivering is clean and safe for consumption. And of course, the public beachgoers want to know if it’s safe to swim or fish in the water.

You can learn more at YSI.com/how-sensors-work

Why Monitor for Dissolved Oxygen

Tue, 23 Jun 2020 08:57:31 GMT

DISSOLVED OXYGEN

Why do we monitor for dissolved oxygen in water?

Let’s talk about why people monitor for dissolved oxygen.

Most aquatic organisms require dissolved oxygen in order to survive, but what exactly is it? Dissolved oxygen, or DO, is just like the oxygen humans use to breathe, but has been dissolved in water. Unlike the bonded molecules of H20, DO refers to the free oxygen that is present in water or other liquids.

Oxygen can enter the water in several ways, such as from the atmosphere, aeration, or photosynthesis. Once dissolved in water, oxygen is available for use by living organisms and can play a large role in many chemical processes in the environment.

In general, a body of water will trend toward 100% air saturation – achieving equilibrium with the atmosphere. This is key to a healthy system, however different events can greatly affect levels of dissolved oxygen.

Supersaturation happens when DO increases above 100%. This type of imbalance is common during peak growth phases of algal blooms where more oxygen is being generated than can be consumed. Turbulent conditions can also lead to supersaturation if more air gets mixed into the water.

Hypoxia occurs when DO decreases to a level that can no longer support aquatic life. As algal blooms fade and die, more oxygen can be consumed and DO levels will drop. Rapid increases in temperature, such as thermal pollution, can also cause hypoxia. As temperature increases, the level of DO in water decreases. Salty runoff can also result in a fish kill DO levels will decrease as salinity increases.

So why do we monitor for dissolved oxygen? A scientist interested in surface water would view it as a direct indicator of a water body’s ability to support aquatic life. A scientist studying ground water could use DO to help determine when stable conditions are met during purging or to regulate the analysis of metals or volatile compounds. A treatment plant operator would be concerned with DO levels for the microbes used to transform wastewater into harmless end products. And of course the public will be concerned about the health of fish and other aquatic species swimming in their local waters.

You can learn more at YSI.com/how-sensors-work

ProSolo Winners Drawing - And Enter to Win One!

Wed, 29 Jan 2020 09:42:50 GMT

Here are the Enter to Win a ProSolo winners from the January 2020 drawing! Congrats!

Of course, you could also be the envy of your colleagues by entering to win one as well.

>>> Enter to Win a ProSolo Water Quality Instrument

Thornton Creek Restoration | Urban Watershed

Tue, 11 Dec 2018 15:06:20 GMT

A wilderness teems just out of sight in rivers, actually below the rivers in the saturated soils, gravel, sand and rocks under and along the river’s main channel. This is the hyporheic zone: an entire zone where functions vital to the overall health of a stream and watershed take place.

And it’s from there in the healthy Cedar River that Seattle’s Thornton Creek gets a new life.

Waters above and below ground constantly interact; flowing into and out of one another, circulating oxygen, removing wastes and moderating temperatures in the main channel, cooling the water in summer and warming it in the winter.

Plenty of small creatures live there, too, many invisible to the naked eye, but performing critical tasks. Invertebrates shred leaf litter, cycling nutrients from the land to the water. Microbes on the surface of the rocks and gravel provide water treatment, consuming the nutrients in fertilizer runoff, and even breaking down hydrocarbons from oil pollution, making the hyporheic a liver of sorts for the river.

The land, surface waters and in-stream and subsurface flows all are connected. So as Seattle Public Utilities (SPU) works to restore Thornton Creek, the city’s largest urban stream, a new idea has been implemented: Why not start at the bottom, and — with a little help from the healthy Cedar River — reassemble and reconnect all the pieces of the watershed to see what happens?

The Thornton Creek watershed covers roughly 11.6 square miles in northeast Seattle and Shoreline. Over 90% of the creek’s main channel, more than 15 miles, flows above ground through more than 700 backyards and through 15 parks and natural areas.

It is both Seattle’s and Shoreline’s largest watershed, and drains into Lake Washington at Matthews Beach Park. That water ultimately goes through the Lake Washington Ship Canal to Puget Sound. The creek is a historic home to at least five species of Pacific salmon and trout.

After decades of development, Thornton Creek had no healthy base to start from. Because of dredging and channelizing, the creek in some cases altogether lacked the gravels and other benthic layers beneath and along the channel.

So the city launched an $11 million experimental restoration in two reaches of Thornton Creek, rebuilding a total of 1,600 feet of the channel from the ground up. The idea was to see if a constructed hyporheic zone can provide localized water-quality treatment in an urban stream.

See how the YSI Pro2030 dissolved oxygen and conductivity/salinity meter played a major role as well in understanding hyporheic zone health.

Video produced by Leaping Frog Films

ProDSS Handheld Multiparameter Water Quality System | YSI

Mon, 06 Feb 2017 19:00:00 GMT

The YSI ProDSS - digital sampling system (https://www.ysi.com/ProDSS) is a portable water quality multiparameter instrument for the measurement of several critical parameters - dissolved oxygen (optical), turbidity, pH, ORP, conductivity, specific conductance, salinity, TDS, resistivity, TSS, ammonium, ammonia, chloride, nitrate, depth (optional), temperature and GPS coordinates.

One of the most impressive features of the ProDSS is its ruggedness. It is drop-rated, drop-tested to one meter on concrete, waterproof, features military spec cable connectors, and can be used in any lighting condition. This rugged design will provide you accurate data in any weather condition year-round. The ProDSS is a true field instrument. The ProDSS is not only an accurate, rugged, and reliable instrument, but it is also very easy to use. For starters, the ProDSS can easily be held in one hand. Combined with the one-cable design, the instrument is very convenient to use in the field.

The ProDSS is designed to meet the needs of any water quality application, such as aquaculture, ground water, surface water, waste water, and coastal applications. Whether you're spot sampling, conducting a low-flow sampling session, profiling, or measuring samples in a lab, the ProDSS will make collecting accurate data easy and efficient. We guarantee the accuracy of the measurement through rigorous specification testing during development and final testing every component of the system, including the handheld, cable, and sensors before they leave our factory.

Request pricing (https://www.ysi.com/request-a-quote).

YSI ProDSS - Digital Sampling System for Water Quality

Thu, 19 Jan 2017 19:00:00 GMT

The YSI ProDSS (digital sampling system) handheld multiparameter meter provides extreme flexibility for the measurement of dissolved oxygen, turbidity, pH, ORP, conductivity, specific conductance, salinity, total dissolved solids (TDS), resistivity, seawater density, total suspended solids (TSS), depth, GPS coordinates, ammonium (ammonia), chloride, nitrate, temperature, and barometric pressure. Some comments customers have sent to us: 'I really think you're hitting a home run with this instrument'.
'I have to say that I am increasingly impressed with every feature of the unit.'
'For spot sampling and profiling this is an excellent multiparameter instrument. The size and functionality knocks it out of the park for this kind of work compared to more cumbersome instruments.'

Check it out! https://www.ysi.com/ProDSS

YSI ProDSS Water Quality Meter Digital Sampling System Video

Tue, 07 Apr 2015 19:00:00 GMT

The YSI ProDSS (digital sampling system) (http://www.ysi.com/ProDSS) is a portable water quality multiparameter instrument for the measurement of several critical parameters - dissolved oxygen (optical), turbidity, pH, ORP, conductivity, specific conductance, salinity, TDS, resistivity, TSS, ammonium, ammonia, chloride, nitrate, depth, temperature and GPS coordinates.

Designed for use in applications such as surface water, groundwater, coastal/estuarine, and aquaculture the rugged and reliable ProDSS allows for the measurement of water quality parameters with digital sensors. The ProDSS uses smart, user-replaceable sensor technology that can be connected in any port and automatically recognized by the handheld while retaining the calibration data.

The ProDSS will also work with the YSI ProODO sensor/cable to provide a DO only instrument. It's also capable of using the ProOBOD optical BOD probe for use in the lab for BOD measurements.

An easy-to-read backlit color display, large memory capacity, simple calibration procedures, rechargeable battery and powerful data management program (KorDSS) all help to make your sampling experience more convenient.

The optional GPS and depth along with a wide range of cables and sensors allows for complete customization of the ProDSS. Military spec connectors, IP67 waterproof, rubber over-molded case and 1-meter drop tests ensures durability to provide years of sampling even in the harshest field conditions.

Parameters Available:

pH
Oxidation Reduction Potential (ORP)/Redox
Optical Dissolved Oxygen/BOD
Turbidity
Conductivity
Specific Conductance
Salinity
Total Dissolved Solids (TDS)
Resistivity
Density
Total Suspended Solids (TSS)
Ammonium
Ammonia
Chloride
Nitrate
Depth
Temperature

Interested in additional information or pricing? http://info.xyleminc.com/ProDSS_Launch_Customer_YSI-ProDSS-Contact-Me-.html?source=youtube

Pro10 Handheld pH or ORP and Temperature Instrument | YSI

Sun, 07 Sep 2014 19:00:00 GMT

Rugged and reliable, the YSI Pro10 (http://www.ysi.com/Pro10) provides everything you need in a handheld instrument for the measurement of either pH or ORP along with temperature.

User-replaceable sensors and cables along with convenient calibration routine feature makes it extremely user friendly. Mil-spec (military spec) connectors, IP67 waterproof and rubber over molded case, and 1-meter drop tests ensure the instrument remains in your hands to provide years of sampling even in the harshest field conditions. The feature set of the Pro10 results in a low total cost of ownership over the life of the product and proves that it is smarter, tougher, and more versatile.

Additional features include:

User-replaceable cables and sensors provide versatility, reduce down time and reduce overall cost of ownership.
Available with 1- 4- 10- 20- and 30-m cable lengths standard (cable management kit included on all cables 4-m and longer).
Smart calibration; the instrument remembers the previous calibration values and simply walks you through the routine.
Stores 50 data sets; no need to write down data.
Large graphic, backlit display and glow in the dark keypad. Usable in any lighting condition. The display is also visible when wearing polarized sunglasses.
Tough. IP67, impact-resistant, waterproof case. Waterproof without the battery cover as well.
Rubber over molded case provides extra durability. Military spec connectors are unsurpassed for ruggedness.
Multiple languages include English, Spanish, French, and Portuguese.
3-year instrument; 2-year cable; 1-year sensor warranty

YSI Pro1020 Dissolved Oxygen and pH or ORP Meter | Water Quality Instrument

Wed, 08 Jan 2014 19:00:00 GMT

Rugged and reliable, the YSI Pro1020 (http://www.ysi.com/pro1020) provides everything you need in a handheld water quality instrument for the measurement of either pH or ORP (oxidation reduction potential) along with temperature, and dissolved oxygen.

User-replaceable sensors and cables along with convenient calibration routine feature makes it extremely user friendly. Mil-spec (military spec) connectors, IP67 waterproof and rubber over molded case, and 1-meter drop tests ensure the instrument remains in your hands to provide years of sampling even in the harshest field conditions. The feature set of the Pro1020 results in a low total cost of ownership over the life of the product and proves that it is smarter, tougher, and more versatile.

Additional features include:
• User-replaceable cables and sensors provide versatility, reduce down time and reduce overall cost of ownership.
• Available with 1- 4- 10- 20- and 30-m cable lengths standard (cable management kit included on all cables 4-m and longer).
• Smart calibration; the instrument remembers the previous calibration values and simply walks you through the routine.
• Stores 50 data sets; no need to write down data.
• Large graphic, backlit display and glow in the dark keypad. Usable in any lighting condition. The display is also visible when wearing polarized sunglasses.
• Tough. IP67, impact-resistant, waterproof case. Waterproof without the battery cover as well.
• Rubber over molded case provides extra durability. Military spec connectors are unsurpassed for ruggedness.
• Multiple languages include English, Spanish, French, and Portuguese.
• Choose either polarographic or galvanic DO sensors.
• Quick response times; 95% DO response time in approximately 8 seconds with standard membrane (fastest response time in the market).
• 3-year instrument; 2-year cable; 1-year sensor warranty (Galvanic DO is 6-months)

YSI Pro1030 Water Quality Meter | Conductivity, pH, ORP

Sun, 10 Nov 2013 19:00:00 GMT

Rugged and reliable, the YSI Pro1030; http://www.ysi.com/pro1030; provides everything you need in a handheld instrument for the measurement of either pH or ORP along with conductivity and temperature. User-replaceable pH and ORP sensors and cables, 50 data set memory, and convenient calibration routine makes it user friendly. Mil-spec (military spec) connectors, IP67 waterproof and rubber over molded case, and 1-meter drop tests ensure the instrument remains in your hands to provide years of sampling even in the harshest field conditions.

• 3-year instrument; 2-year cable; 1-year sensor warranty
• User-replaceable cables and sensors (pH and ORP). Super stable, 4-electrode conductivity sensor built into the cable.
• Smart calibration in the instrument remembers the previous calibration values and simply walks you through the routine.
• Stores 50 data sets; no need to write down data
• Graphic, backlit display and glow in the dark keypad.
• Available with 1- 4- 10- 20- and 30-m cable lengths standard.
• Tough. IP67, impact-resistant, waterproof case. Waterproof without the battery cover as well. Rubber over molded case provides extra durability. Military spec connectors.
• A true field instrument - the display is visible with polarized sunglasses on.
• Multiple languages include English, Spanish, French, and Portuguese.

YSI Pro30 Conductivity/Salinity Water Quality Meter Video

Mon, 19 Sep 2011 19:00:00 GMT

YSI Pro30 conductivity meter. http://www.YSI.com/pro30. Measure conductivity, specific conductance, salinity, TDS (total dissolved solids) and temperature. Great for field work.

YSI Pro2030 DO/Conductivity Water Quality Meter Video

Wed, 31 Aug 2011 19:00:00 GMT

YSI Pro2030 DO/conductivity meter. http://www.YSI.com/Pro2030. This DO/conductivity water quality meter is ideal for any field application. The instrument is rugged and extremely simple to use.

YSI Pro20 Dissolved Oxygen Meter Video

Wed, 17 Aug 2011 19:00:00 GMT

YSI Pro20 dissolved oxygen meter. http://www.YSI.com/pro20. This dissolved oxygen instrument is designed tough enough for the field and smart enough for the lab conducting BODs.