Spotlight Close Title Try searching by key words, order- or product code or serial number e.g. “CM442” or “Technical information” Enter at least 2 characters to start the search. Industry Category Technical excellence Technical excellence Technical excellence Technical excellence Technical excellence Two-wire field device for hazardous and non-hazardous areas and hygienic applications in chemical, life sciences and food & beverage industries Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Show specs at a glance Show specs at a glance Input One channel transmitter for Memosens and analog (pH, ORP, conductivity) Output / communication 4 to 20 mA, HART (optional), additional second output possible; HART communication, also later activatable Ingress protection Field housing: Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Input 1 to 2x Memosens digital input Output / communication 2 to 4x 0/4 to 20 mA current outputs Alarmrelay, 2x relay Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Measuring range Application A • pH: 1 to 12 • pH: 0 to 10 Process temperature Application A: –15 to 80 °C (5 to 176 °F) Application B: 0 to 135 °C (32 to 275 °F) Application F: 0 to 70 °C (32 to 158 °F) Process pressure Applications A and B: 0.8 to 17 bar (11.6 to 246.5 psi) absolute Application F: F L E X New Compare Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Output / communication connection to Netilion Cloud Platform: Ethernet; radio communication Compare Prices temporarily unavailable Price after login Price on request Add to cart Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Process temperature 0 to 80°C (32 to 176°F) (87 psi at 68°F) F L E X Compare Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Measuring range pH 0 to 14 Process temperature Version LH: 0 to 110 °C (32 to 230 °F) Version NN: 0 to 80 °C (32 to 170 °F) Process pressure 1 to 10 bar abs at 80 °C (15 to 145 psi at 176 °F) F L E X Compare Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Measuring range pH: 0 to 14 Process temperature Application N: 0 to 100 °C (32 to 212 °F) Up to 140 °C (284 °F) for sterilization Process pressure Application M: 0.8 to 14 bar (11.6 to 203 psi) absolute Application N: 0.8 to 7 bar (11.6 to 101.5 psi) absolute F L E X Compare Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Measuring range Application B: • pH: 0 to 14 Process temperature 1 to 140 °C (32 to 284 °F) Process pressure 0,8 to 14 bar (11,6 to 203 psi) (absolute) F L E X Compare Show specs at a glance Show specs at a glance Prices temporarily unavailable Price after login Price on request Add to cart Measuring range ORP: –1 500 to 1 500 mV Application B 0 to 140 ° C (32 to 284 ° F) Version TB: Version TU, TP (pressurized reference): 0 to 140 ° C (32 to 284 ° F) (140 ° C (284 ° F) for a limited period (e.g. 20 min)) maximum 100 ° C (212 ° F) in continuous operation due to increasing pressure drop at T> 100 ° C (212 ° F) Process pressure Application B: 0.8 to 14 bar (11.6 to 203 psi) absolute Application H: 0.8 to 7 bar (11.6 to 101,5 psi) absolute Load more Do you need help selecting your next pH sensors and transmitters? More than 30% of all quality-relevant measurements in processes are pH measurements. That's why reliable pH sensors & transmitters are extremely important for plant optimization and process safety. We offer an extensive portfolio for all conditions, such as stable processes, fast changing media compositions, sticky media, hazardous areas or hygienic applications. Discover our ISFET, enamel or glass pH sensors, transmitters, assemblies and calibration solutions by clicking on the button below. How to select pH electrodes pH sensors and transmitters are used in many industries such as chemicals, water & wastewater, food & beverage, pharmaceuticals, power plants, primaries and oil & gas. The selection of the sensor depends on the application. Choose the glass sensor's diaphragm and reference system according to your needs. Use ISFET sensors where glass breakage is intolerable or media contain high amounts of organic solvents. Apply enamel sensors when long-term stability and lowest maintenance are required. The pH value of a liquid can be calculated using the potentiometric measurement principle. This video shows what it is about and how this measuring principle works. pH measurement with glass electrodes and enamel electrodes The pH value is used as a unit of measurement for the acidity or alkalinity of a liquid medium. The pH-sensitive element of glass electrodes is a glass bulb that supplies an electrochemical potential which is dependent upon the pH value of the medium. This potential is generated because small H+ ions penetrate through the outer layer of the membrane while the larger negatively charged ions remain in the solution. Glass pH probes contain an integrated Ag/AgCl reference system that serves as the required reference electrode. The pH value is calculated from the potential difference between the reference system and the measuring system using the Nernst equation. Our pH sensors and transmitters achieve outstanding linear measuring performance over an extremely wide pH range! The measuring principle of enamel pH electrodes corresponds to that of glass pH sensors, however, the pH-sensitive element is enamel. ©Endress+Hauser pH measurement with ISFET electrodes The pH value is measured with an ion-selective field effect transistor (ISFET). It is a simple transistor with a source and drain that are separated from the base by a semiconductor. Hydrogen ions from the medium may accumulate here. The resulting positive charge on the outside is 'mirrored' on the inside of the base where a negative charge occurs. This makes the semiconductor channel conductive. The more H+ ions accumulate on the base, the more current can flow between the source and drain. ©Endress+Hauser Benefits Our pH sensors and transmitters meet all requirements from basic functionality up to multichannel and multiparameter measurement. We offer pH buffers, pH solutions and pH standards for pH calibration to ultimate precision. They are produced in our own permanent calibration laboratory that has successfully passed the DAkkS accreditation (German accreditation authority). The different types of electrodes cover all kinds of diaphragms and reference systems, from dirt-repellent PTFE junctions over highly sensitive ceramic diaphragms to blocking-resistant open apertures. We offer pH assemblies for all fields of applications: fixed installation assemblies, immersion assemblies, flow assemblies and retractable assemblies. Automated systems for calibration, adjustment and cleaning ensure optimum performance of the pH sensors and transmitters in chemical processes, pharmaceuticals production or hygienic applications. Downloads Selection and engineering guide for different industries and applications. My Endress+Hauser Boost efficiency and save valuable time with a My Endress+Hauser account! 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