User manual EUTECH INSTRUMENTS DISSOLVED OXYGEN PROBE

[. . . ] The probe is virtually maintenance free, requiring only that its membrane be kept reasonably clean. The anode remains fully active throughout its entire lifetime, which may be several years. The membrane is very robust and can be wiped clean with a cloth or paper. It is recommended to clean the membrane from time to time to ensure maximum reliability. [. . . ] Unfortunately, it is not possible to answer this question. A new probe needs more frequent calibration than an "old". Calibration frequently also depends on the accuracy desired. If an accuracy of +/- 0. 5 ppm is sufficient, calibration once a month is more than enough. It is, however, much better to perform one thorough calibration than two quick ones. Give the probe time to stabilize, check the barometer and decide if correction for air pressure is necessary. Check the salinity if your farm is a salt-water facility! 3 3. 2 Maintenance The probe's membrane must be kept free from deposits. All surfaces in a biologically active system will be covered by a film composed mostly of bacteria. This bacteria film acts as a diffusion barrier for the oxygen that must diffuse through the membrane. The membrane must, therefore, be cleaned at regular intervals, the frequency depending on the actual condition. Cleaning can be performed with a cloth or soft paper. The membrane is strong and not easily damaged, but do not try to scratch it clean with a fingernail!The probe should not be taken apart unless it needs renovation. There is no need to exchange the electrolyte regularly as in conventional probes!Other Points Worth Considering Even though the Eutech probe is one of the most robust available, it should be treated carefully. It measures at few thousands of a gram of oxygen, which it must "drag" out of the water around it. So, if, in your opinion, it performs mysteriously, ask your dealer or us about it. You are certain to get the help you need! 4 4 4. 1 SERVICE PROCEDURE DO Probe membrane replacement and probe renovation All probe types need membrane replacement if the membrane is damaged. Probes used in aquaculture (type 1) may need renovation if, after some years use, it is not possible to calibrate up to the correct value. Other probes should NOT need renovation unless subject to extreme conditions. Eutech probes do NOT need regular renovation. 1) Start by cleaning the outer of the probe, then unscrew the cap. [. . . ] A kit can be purchased containing: A cap mounted with a membrane, an anode, nut and 50 ml of electrolyte. Loose membranes and the tool to remove the ring are also available. Users with many points of measurements are recommended to stock one or more probes. The shelf-life of a ready-to-use probe is very long ­ several years, and it can be stored dry if the ambient temperature is not too high. [. . . ]