Calibration should be checked daily and after relevant changes of ambient conditions (i.e. For most applications, air calibration is sufficient. One or two calibration points can be performed on the DO meter / electrode system before measuring samples. Refer to the electrode manual for the procedure. It must be plug into the electrode body before using the DO electrode. The DO tip is packaged with a drying agent in a sealed aluminum foil bag when shipped. The 9551-20D / 100D comes with stainless steel protective guard that shields the DO tip from getting damage and attached cable hook that helps secure the electrode’s connection to the meter and prevents the cable from breaking.Įach DO electrode comes with one DO tip. A magnetic stir plate should be used with the DO electrode for the stirrer to function. The 9551-20D comes with stirrer (and its casing) and an adapter to fit the electrode body into standard biological oxygen demand (BOD) bottles. The DO tips have lead anode and silver cathode submerged in KOH electrolyte solution and isolated from sample by a gas permeable membrane.Īside from DO tips, the DO electrodes are also supplied with accessories. Electrode bodies are made of durable plastic. There are two DO electrode models available, the 9520-10D with 7541 DO tip and 9551-20D (1m cable) / 100D (10m cable) with 5401 DO tip, which are intended for laboratory and field applications, respectively. Sodium sulfite (Na2SO3) or Nitrogen gas.Clean water (e.g., distilled, deionized, or tap water).Simply, plug the DO tip into the electrode body to perform calibration and measurement and unplug it when the DO electrode will be stored for a long period. The DO tips require no maintenance, making them beneficial for both expert and novice users and ideal for continuous measurements in the laboratory or field. With the advantages of galvanic DO electrodes and improvement of user experience in mind, HORIBA introduced galvanic DO electrodes equipped with replaceable innovative DO tips for hassle-free plug-and-use operation and built-in temperature sensors for temperature compensation on measured DO values. To reduce downtime, the replaceable parts should be readily available and users should know how to perform maintenance. The usual maintenance involves periodic changing of the membrane or membrane cap assembly, refilling the electrolyte, and cleaning the anode and cathode. The advantages of galvanic DO electrodes over polarographic DO electrodes are that they don’t require outside voltage source and warm-up time to operate and their electrolyte can be used indefinitely.Įlectrochemical DO electrodes available in the market have replaceable electrolyte and either loose membranes or membrane cap assemblies (caps pre-fitted with membranes). There are two types of electrochemical DO electrodes: polarographic and galvanic. They are also integrated with temperature sensors to measure the temperature of standards and samples and allow the DO meter to compensate the temperature effect on the measured DO values. ![]() Dissolved Oxygen Electrode Care and Maintenance ProceduresĮlectrochemical dissolved oxygen (DO) electrodes are composed of anode and cathode, which are submerged in electrolyte solution and enclosed in a cap fitted with hydrophobic, gas permeable membrane.
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