{"product_id":"horiba-do-electrode-replacement-membranes-tips-stirrer","title":"Horiba DO Electrode Replacement Membranes, Tips \u0026 Stirrer","description":"\u003cp\u003eReplacement membranes, electrode tips and stirrer components for HORIBA dissolved oxygen electrodes. These are the wear parts of a membrane DO sensor and are expected to be replaced periodically — they are the difference between a DO electrode that holds calibration and one that appears to have failed.\u003c\/p\u003e\n\n\u003ch3\u003eSelect the item for your electrode\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5402 replacement DO membrane\u003c\/strong\u003e (3200781553) — for the #9552 series field DO electrodes, including 9552-20D and 9552-50D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5401 replacement DO tip\u003c\/strong\u003e (3014072770) — for the #9550 and #9551 DO electrodes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7544 replacement DO membrane\u003c\/strong\u003e (3200891724) — for the 9521-10D laboratory DO and BOD electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7544 DO tip stirring set\u003c\/strong\u003e (3200897227) — replacement stirrer for the electrode tip of the 9521-10D DO electrode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck your electrode model before ordering — membranes are not interchangeable between the field 9552 series and the laboratory 9521-10D.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to replace\u003c\/h3\u003e\n\u003cp\u003eReplace the membrane if the electrode is slow to reach a stable reading, will not hold calibration between uses, reads erratically, or if the membrane is visibly wrinkled, stretched, fouled, or has trapped bubbles or deposits beneath it. Membrane life depends on how dirty your samples are, so heavy wastewater and sludge users should expect to replace more often than laboratory users. Replacing a membrane is far cheaper than replacing an electrode, and most electrodes assumed to be dead simply need this service.\u003c\/p\u003e\n\n\u003ch3\u003eGood practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKeep at least one spare membrane on hand before a sampling event — a failed membrane in the field ends the day's DO data\u003c\/li\u003e\n\u003cli\u003eAlways recalibrate after fitting a new membrane and electrolyte\u003c\/li\u003e\n\u003cli\u003eAvoid touching the membrane surface; handle by the cap\u003c\/li\u003e\n\u003cli\u003eCheck for trapped air bubbles when fitting, since a bubble under the membrane will cause a false high reading\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode manuals and maintenance instructions\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eComplete replacement DO electrodes, calibration solutions and other electrode consumables are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"5402 - DO Membrane for #9552 Series - 3200781553","offer_id":48226408595646,"sku":"3200781553","price":190.0,"currency_code":"USD","in_stock":true},{"title":"5401 - DO Tip for #9550 \/ #9551 - 3014072770","offer_id":48226408628414,"sku":"3014072770","price":216.0,"currency_code":"USD","in_stock":true},{"title":"7544 - DO Membrane for 9521-10D - 3200891724","offer_id":48226408661182,"sku":"3200891724","price":270.0,"currency_code":"USD","in_stock":true},{"title":"7544 - DO Tip Stirring Set for 9521-10D - 3200897227","offer_id":48226408693950,"sku":"3200897227","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_7544_Replacement_DO_Electrode_Tip_6af2871ac9.jpg?v=1785337165","url":"https:\/\/envirotechonline.com\/products\/horiba-do-electrode-replacement-membranes-tips-stirrer","provider":"EnviroTech Services","version":"1.0","type":"link"}