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.
pH is measured by a sensing electrode for Hydrogen and a reference electrode along with a meter to measure the electrode potential. The Xylem 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.
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YSI ProDSS - Digital Sampling System
The YSI ProDSS - Digital Sampling System - is the ultimate water quality field instrument for sampling and profiling. With the ProDSS, we have answered our customer's demands to produce a truly rugged, reliable and smart multiparameter handheld instrument.
YSI Professional Plus Multiparameter Meter
The YSI Professional Plus handheld multiparameter meter provides extreme flexibility for the measurement of a variety of parameters such as DO, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature.
YSI Pro1020
The Pro1020 provides everything you need in a handheld meter that measures dissolved oxygen and temperature along with either pH or ORP (redox). Rugged, simple and reliable. Measure pH or ORP, dissolved oxygen, and temperature.
YSI Pro1030
The Pro1030 provides everything you need in a handheld meter that measures pH or ORP (redox) along with conductivity. Rugged, simple and reliable. Measure pH or ORP, salinity, conductivity, specific conductance, TDS, and temperature.
YSI Pro10 pH / ORP Meter
The Pro10 provides everything you need in a handheld meter that measures temperature along with either pH or ORP (redox). Rugged, simple and reliable. Measure pH or ORP, and temperature.
WTW MultiLine® IDS
The new multi-parameter systems with intelligent, digital sensors for pH, dissolved oxygen (DO) and conductivity measurement revolutionize multi-parameter measurement:
The signal processing is completely located in the sensor, and the measuring signal is transmitted to the meter without interference and in a clearly identifiable manner via thin, highstrength cables. A wide range of sensors are available for virtually every application.
SI Analytics Portable Meters for Analog Electrodes
Our 2nd generation of Handylab devices offers analog or digital options for the measurement of pH, ORP, dissolved oxygen and conductivity in the lab and in the field.
SI Analytics Portable Meters for IDS Electrodes
The new generation of HandyLab meters with IDS
While the analog HandyLabs offer a single traditional analog channel, our IDS series Handylab 600 and 680 devices take full advantage of our new digital technologies.
YSI EXO2 Multiparameter Sonde
The EXO advanced water quality monitoring platform includes the versatile multiparameter EXO2 sonde for oceanographic, estuarine, or surface water applications. Collect data to 250m with the advanced EXO2 sonde – contains six replaceable 'smart' sensors and a central wiper to clean biofouling.
YSI EXO1 Multiparameter Sonde
Capturing accurate data in fresh water, ground water and marine aquatic environments is easy with . The versatile multiparameter EXO1 sonde is ideal for estuarine, surface water, or ground water applications.
Instrument Only. Cables, probes/sensors, and accessories sold separately - please see the "Accessories" tab for details.
WTW MPP IDS – Multi-parameter Depth Sondes within IDS System
Up-to-date digital depth measurement with the WTW IDS system: A built-in barometric pressure and temperature compensated depth sensor combines dissolved oxygen, pH or ORP and conductivity measurements with accurate depth readings.
YSI EXO3 Multiparameter Sonde
Offering the greatest value of any sonde available in the market, EXO3 combines the maneuverability of EXO1 with the powerful antifouling wiper of the EXO2. EXO3 is a purpose-built sonde for monitoring major water quality parameters, including: pH, conductivity, temperature, turbidity and dissolved oxygen.
WTW SensoLyt® pH / ORP Sensors
For continuous pH/ORP measurement, especially under the difficult conditions very often found in sewage treatment facilities, very high demands are made concerning the reliability and operating safety of the systems employed.
YSI 6589 Fast-Response pH Sensor
Simple, accurate pH measurement in sensors designed for minimal maintenance in sampling, profiling, and long-term monitoring applications.
SI Analytics SteamLine Sterilizable Electrodes
Steam-sterilizable, low-maintenance pH and redox electrodes, also with built-in temperature sensors for applications in biotechnology, food technology and process chemistry
SI Analytics ProcessLine Electrodes
The special construction of the ProcessLine electrodes brings them very close to the optimum for liquid electrolyte electrodes with respect to their accuracy, stability, rapid response and long working life.
SI Analytics Memosens® Process Electrode
Our Memosens® series comprises a number of pH and redox electrodes. They are compatible with many available measuring devices based on the Memosens® protocol. MemoSens follow in the footsteps of our established ProcessLine, SteamLine and annular-gap electrodes.
All Memosens® electrodes are equipped with a NTC 30 kΩ temperature sensor.
SI Analytics BlueLine Electrodes
The most popular series of laboratory electrodes manufactured by SI Analytics in Mainz, Germany is the BlueLine. Compact, easy to use, and compatible with not only our own but most types of laboratory meter, BlueLine offers a viable alternative no matter what application style of electrode is required.
WTW inoLab® Laboratory Multi-parameter Benchtop Meters
Application oriented benchtop sets for multiple parameter monitoring: pH, mV, ISE, saturation, concentration, partial pressure, conductivity, special resistance, salinity, TDS, temperature
Cutting edge technology from WTW for demanding laboratory applications. Two digital inoLab® multi-parameter instruments for IDS sensors for parallel measuring of one identical or varying parameters. Up to three sensors (inoLab® Multi 9430 IDS) can be connected. A large glass shield protects the graphic display and supports the presentation of the measuring values and recognition of important information. The innovative and antibacterial keypad helps to protect against microbiological contamination. The solid zinc die-casting lower case gives the meters a safe standing and also protection from the environment. As a special feature, both models can be upgraded with an additional module for conventional pH measurement.
WTW inoLab® pH Benchtop Meters
The inoLab® family: Advanced measuring technology offers new functions including automatic AutoRead or CMC (Continuous Measurement Control) making measurements more convenient and reliable than ever.
The user interface, large display and keypad with tactile feedback provide an exceptional user experience and error-free operation.
All benchtop meters are available in application oriented sets including sensors and accessories.
WTW inoLab® IDS - Benchtop
Connect digital IDS sensors to the Inolab for the measurement of pH, ORP, conductivity, and DO/BOD.
- Uncompromised measuring accuracy
- Digital sensor recognition
- Smart sensor evaluation
WTW InoLab® pH/Ion 7320
Precise pH/ISE benchtop meter with enhanced ISE methods for concentration measurement with ion selective electrodes
- Simultaneous measurements of pH, ion concentration or ORP
- Flexible and convenient data transfer
- Visualization of the optimum measuring range supports correct measurements (CMC function)
Aanderaa SeaGuard II DCP
The brand new acoustic profiler joining the SeaGuard family. It features innovative development of the acoustic profiling capacity and an exceptional ability to collect high quality current information on moving and tilting moorings. Available as a self-recording instrument, it also integrates unique real time features to meet your application needs.
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Aanderaa RCM Blue
The RCM Blue is a self-recording Current Meter which measures water temperature in salt or fresh water, and a battery container with battery capacity up to 70Ah. The Doppler Current Sensor is an upgraded version of the proven SeaGuard ZPulse sensor. The instrument configuration and data retrieval is done via Bluetooth which eliminates the need to open the pressure case for repeated deployments.
Aanderaa SeaGuard RCM
The single-point SEAGUARD® RCM series is a completely new generation of current meters based on the SEAGUARD® datalogger platform and the ZPulse® multi-frequency Doppler Current Sensor (DCS). SEAGUARD® Products are based on modern technology and are the basic modules of our underwater observatory. They may be used as a multi-parameter instrument in the sea and in freshwater and feature a modular plug-and-play architecture.
YSI 6951 Pontoon - Vertical Profiling System
The YSI 6951 Pontoon Vertical Profiling System offers user-programmable sample intervals, redundant error recovery logic that detects unexpected activity and recovers automatically, and is compatible with all YSI EXO and 6-Series sondes equipped with depth.
WTW IQ SensorNet 2020 3G Controller
With an easily scalable solution, the 2020 3G 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.
YSI 6952 Buoy - Vertical Profiling System
The YSI 6952 Buoy - Vertical Profiling System offers user-programmable sample intervals, redundant error recovery logic that detects unexpected activity and recovers automatically, and is compatible with all YSI EXO and 6-Series sondes equipped with depth.