Contact Careers Investor Relations Watermark Home Products Parameters Applications Rentals Support About Home > Parameters > pH / ORP pH / ORP 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. Handheld Sonde Sensor Benchtop System & Online Related Documents Xylem Surface Water Catalogue Spec Sheet: WTW Inolab Range Xylem HydroMet Catalogue Catalogue: ProDSS Range Xylem Analytics UK Xylem Analytics is a major global manufacturer of market leading brands such as YSI, SonTek, Aanderaa, MJK and WTW. The group's success is built on innovation & application expertise with water quality monitoring instrumentation and flow monitoring instrumentation. Customers around the world choose Xylem Analytics because our instruments are designed and manufactured specially for their applications. More about Xylem Analytics UK Explore Home Products Parameters Applications Rentals Support About Get in touch Unit 7 Dunham's Court, Dunham's Lane, Letchworth, SG6 1WB salesuk@xyleminc.com +44 1462 673581 @XylemAnalytics facebook.com/XylemAnalytics Aanderaa, Bellingham + Stanley, ebro, Global Water, HYPACK, MJK, OI Analytical, Royce Technologies, SI Analytics, SonTek, WTW and YSI are trademarks of Xylem Inc. or one of its subsidiaries. Specifications on all products subject to change at any time. Learn more about Xylem and Xylem Analytics. We use cookies and beacons to improve your experience on our site. Read more about this in our Privacy Policy. Transparency in Supply Chains Bellingham + Stanley, ebro, SI Analytics, OI Analytical, WTW (lab & field products) and YSI (life science products) are all Xylem brands operating in the UK from Xylem’s Tunbridge Wells facility. Registered in England and Wales No. 140250. Registered Office: Bellingham & Stanley Ltd., Xylem, Longfield Road, Tunbridge Wells, Kent, TN2 3EY, UK. VAT No. GB 220 3350 25 Aanderaa, Global Water, MJK, Royce Technologies, SonTek, WTW (process products) and YSI (environmental products) are all Xylem brands operating in the UK from Xylem’s Letchworth facility. Registered in England and Wales No. 04838831. Registered Office: Xylem Analytics UK Ltd., Xylem, 7 Dunham's Court, Dunham's Lane, Letchworth Garden City, England, SG6 1WB, UK. VAT No. GB 828 1979 85 Copyright © 2016-2021 Xylem Analytics UK Ltd. / Xylem Inc. All Rights Reserved. | Terms & Conditions | Rental Terms & Conditions STEP 1 OF 2 Privacy By providing personal data to Xylem, you acknowledge that you have read and understand the terms of our Website Privacy Statement Accept Why am I seeing this? English Dansk Magyarország Россия Nederland Français Polski Svenska Español Italiano Deutsch Norsk Suomi Português slovenčina 中文 日本語