YSI pH

pH determines the acid and base characteristics of water. A pH of 7.0 is neutral; values below 7 are acidic and values above 7 are alkaline. Excessively high or low pH levels are often associated with nutrient deficiencies, metal toxicities, or other problems for aquatic life. High pH makes ammonia more toxic. During algal blooms, photosynthesis increases the water pH, especially in stagnant or slow-moving water.

YSI EcoSense pH100 with piercing tip pH sensor.

YSI 6561 pH Sensor with guard for 6-Series sondes.

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Want to return a product for service? Here you’ll find authorized service centers and instructions on how to send in your YSI pH product.

pH is measured by a sensing electrode for Hydrogen and a reference electrode along with a meter to measure the electrode potential. The YSI pH sensor is a glass bulb filled with a solution of stable pH (usually 7), so the inside of the glass surface experiences constant binding of H+ ions. The outside of the bulb is exposed to a water sample where H+ varies. The resulting differential of H+ creates a potential which is read by the meter versus the stable potential of the reference electrode.

Presentation: How to Make Good pH Measurements
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		6600V2 Make the most of your environmental monitoring. The YSI 6600 V2 data sonde is the most comprehensive water quality monitoring equipment available with simultaneous measurement of conductivity (salinity), temperature, depth or level, pH/ORP plus...

		6920 V2 Compact Data Sonde for Unattended Monitoring The YSI 6920 V2 sonde is an economical water quality logging system, ideal for long-term in situ monitoring and profiling. Real-time turbidity monitoring, dissolved oxygen monitoring, algae monitoring, and more.

		6820 V2 Compact Sonde for Field Sampling The YSI 6820 V2 is a cost-effective data sonde for profiling and spot-checking water quality in rivers, lakes, wetlands, wells, estuaries, and coastal waters.

		600XL V2 and 600XLM V2 Small Packages - Economical Sampling or Logging Both the YSI 600XL V2 (sampling) and the YSI 600XLM V2 (logging) data sondes offer economical solutions in small packages for surface water and ground water applications. Both models easily fit into 2-inch wells and measure a range of fundamental parameters, including oxygen - with the YSI ROX™ optical dissolved oxygen sensor - and level, using a highly-accurate vented sensor.

		6600EDS Extended Deployment for Harsh Environments The 6600EDS multiparameter sonde accurately measures 10 parameters in severe fouling environments for extended periods. The sonde has two optical ports, conductivity/temperature port, Rapid Pulse DO port, and pH/ORP port. The 6600EDS also offers an extended brush that cleans the pH/ORP and Rapid Pulse DO sensors.

		600QS The Quick Solution to Handheld Sampling Combined for convenience, the YSI 650 MDS display-datalogger and the YSI 600R sonde allow you to collect 11 parameters simultaneously in real time.

		600R Water Quality Sampling Sonde The YSI 600R provides water quality sampling in a small package for surface water and ground water applications. With a diameter of less than two inches (4.2 cm), the 600R easily fits into wells.

		6920DW Monitor Drinking Water in Distribution System The YSI 6920DW is a portable instrument which measures free chlorine, turbidity, and other parameters. Take readings at multiple points along a drinking water distribution system; the collected data gives you a comprehensive view of your water quality and can help you detect events of concern.

		600DW Sidestream measurements for distribution systems The YSI 600DW is a portable instrument which measures free chlorine and other parameters. Take readings at multiple points along a drinking water distribution system; the collected data gives you a comprehensive view of your water quality and can help you detect events of concern.

		6500 Process Monitor Improve Operational Efficiency with Continuous Data With 8 scalable 4-20 mA current loop channels, 4 SPDT relays, and the ability to continuously monitor dissolved oxygen, conductivity, temperature, and pH via a YSI 6-Series sonde, the YSI 6500 helps you stay one step ahead in data collection.

		5200A Multiparameter Monitoring and Control Instrument Designed specifically for Aquaculture Systems, the YSI 5200 and AquaManager™ Software integrate process control, alarming, and data management into one product. Simple enough to monitor one tank, powerful enough to manage a full scale farming operation from anywhere in the world. Simultaneously measure dissolved oxygen, pH, conductivity, ORP, salinity and temperature.

		Professional Plus Handheld Multiparameter Instrument The YSI Professional Plus handheld multiparameter meter provides extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.

		556MPS Handheld Multiparameter Instrument Rugged, reliable and waterproof, the YSI 556 MPS (Multiprobe System) combines the versatility of an easy-to-use, easy-to-read handheld unit with all the functionality of a multiparameter system.

		pH10A Pen-style pH Tester Instrument The pH10A is part of the EcoSense® family of products. It's the perfect instrument for economical spot sampling of pH and temperature in many applications including wastwater, surface water, aquaculture, hydroponics, pools, and education.

		pH100A Handheld pH or mV Meter YSI's EcoSense® product line of compact, handheld instruments includes the pH100A pH meter. For simple, one handed operation for pH readings or mV values and temperature the pH100A is a logical choice.

		IQ SensorNet 2020 XT Improve Operational Efficiency with Continuous Data With an easily scalable solution, the 2020 XT allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately. "We haven't had any issues and are very happy with it. Installation and setup are very user friendly."

		IQ SensorNet 182 Models Improve Operational Efficiency with Continuous Data With an easily scalable solution the 182, 182 XT, and 182 XT-4 allow for the connection of 1-4 sensors depending on which terminal you choose. Add sensors at any time and at any location or change them out with ease. This completely modular plug-and-play system allows you to monitor the water quality in your wastewater or aquaculture system continuously and accurately.

		Vertical Profilers For watersheds, source water and reservoir monitoring, YSI Vertical Profiling Systems provide automated data collection and telemetry throughout a water column. These water quality profilers are available in 3 different deployment configurations, each featuring: Rugged, non-corrosive winch and drive mechanism Software for easy set-up, deployment, water quality analysis and export User-selectable sample intervals

		MultiLab 4010-2 and 4010-3 Laboratory Instruments for pH, ORP, conductivity and BOD in any combination Perform accurate lab pH, ORP, conductivity or BOD measurements with the YSI 4010-2 or 4010-3 in any combination.

		5564 pH Sensor pH sensor for the YSI Model 556 instrument

		5565 pH & ORP Sensor pH and ORP sensor for the YSI Model 556 instrument

		603166 Pro Plus BOD pH Lab Kit US Pro Plus meter, BOD probe, Lab quality pH probe, Lab dock, US power supply

		603184 Pro Plus 4-Meter Field Kit Polarographic and pH Pro Plus meter, 4-meter cable with Polarographic DO probe, field pH probe, carrying case, cable management kit

		603186 Pro Plus 10-Meter Field Kit Polarographic and pH Pro Plus meter, 10-meter cable with Polarographic DO probe, field pH probe, carrying case, cable management kit

		603188 Pro Plus 4-Meter Field Kit Conductivity and pH Pro Plus meter, 4-meter cable with conductivity built-in, field pH probe, carrying case, cable management kit

		603189 Pro Plus 10-Meter Field Kit Conductivity and pH Pro Plus meter, 10-meter cable with conductivity built-in, field pH probe, carrying case, cable management kit

		603190 Pro Plus 4-Meter Field Kit Polarographic DO, Conductivity and pH Pro Plus meter, 4-meter cable with conductivity built-in and Polarographic DO probe, field pH probe, carrying case, cable management kit

		603191 Pro Plus 4-Meter Field Kit Galvanic DO, Conductivity and pH Pro Plus meter, 4-meter cable with conductivity built-in and Galvanic DO probe, field pH probe, carrying case, cable management kit

		603220 Pro Plus BOD pH Lab Kit International Pro Plus meter, BOD probe, Lab quality pH probe, Lab dock, International power supplies

		603223 Pro Plus 4-Meter Field Kit Polarographic DO, Conductivity, and pH/ORP Pro Plus meter, 4-meter cable with conductivity built-in and Polarographic DO probe, field pH/ORP probe, carrying case, cable management kit

		603224 Pro Plus 4-Meter Field Kit Galvanic DO, Conductivity, and pH/ORP Pro Plus meter, 4-meter cable with conductivity built-in and Galvanic DO probe, field pH/ORP probe, carrying case, cable management kit

		606110 Replacement pH Sensor for the pH10 (gray) YSI replacement pH sensor for the pH10A pen-style instrument.

		MultiLab Advanced BOD and pH Lab Kit, 626574

		MultiLab BOD and pH Lab Kit, 626573

		MultiLab pH Lab Kit, 626572

		pH Electrode, Plastic, 103740Y (1.5 meter cable)

		pH Electrode, Plastic, 103741Y (3 meter cable)

		pH Sensors (6-Series) Simple, accurate pH measurement in sensors designed for minimal maintenance in sampling, profiling, and long-term monitoring applications.

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Making Better pH Measurements in Sampling and Long-Term Monitoring Applications

Archived Webinar:
Making Better pH Measurements in Sampling and Long-Term Monitoring Applications

Original Broadcast: Tuesday, June 7, 2011 —1:00-2:00 PM Eastern Time (US)

YSI's Mike Lizotte and Tom Moeggenberg present an informative webinar about making accurate pH measurements in sampling and monitoring applications.

Topics include:
• Choosing the right sensor for your application
- Sampling vs. long-term sensor options
- Glass bulb, flat glass, and hemispherical bulbs
- New Amplified pH sensor technology
- Replaceable vs. refillable probes
• How to make good pH measurements
- Calibration procedures
- Using millivolts to estimate sensor life and anticipate replacement
- How to recondition and service a pH sensor
- Field measurements in Low Ionic Conditions
- Preventing biofouling on sensors

Who should attend:
• Those using submersible field sensors for water quality sampling and monitoring
• Those measuring pH for water quality concerns, including climate change, ocean acidification, acid mine drainage, aquaculture and fisheries, and NPDES compliance

Download Slide Presentation: Making Good pH Measurements

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Making Better pH Measurements in Sampling and Long-Term Monitoring Applications