{"product_id":"apera-do502-do-electrode-inner-solution-30ml","title":"Apera DO502 Inner Solution Refill for DO500, 30 mL | AI4112","description":"\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:1400px;margin:0 auto;color:#26332C;font-size:1rem;line-height:1.75;\" id=\"bts-do502-description\"\u003e\n\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(20px,4vw,42px);border:1px solid #B7D0BF;background:#F1F7F3;border-radius:14px;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#245B45;margin:0 0 12px;\"\u003eAPERA INSTRUMENTS \/ DO502 \/ AI4112\u003c\/p\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eThe specified 30 mL inner solution for DO500 maintenance\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eApera DO502 is a 30 mL inner solution refill for the Apera DO500 polarographic dissolved oxygen electrode. It is the solution specified in the DO500 membrane-cap replacement procedure, with an exact-SKU safety data sheet available for handling and storage guidance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do502-do502-refill-source.webp?v=1792336593\" alt=\"White dispensing bottle shown on the Apera DO502 30 mL refill listing\" width=\"2200\" height=\"2200\" loading=\"lazy\" style=\"display:block;width:100%;max-width:340px;height:auto;object-fit:contain;margin:0 auto;box-sizing:border-box;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.85rem;line-height:1.55;color:#5D6C63;text-align:center;margin-top:12px;\"\u003eManufacturer product photograph for DO502. The bottle is unlabelled in the source image.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cdetails id=\"bts-do502-guide\" style=\"border:1px solid #FF931A;border-radius:10px;margin-top:28px;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;box-sizing:border-box;font-size:1rem;font-weight:600;padding:18px;background:#FF931A;cursor:pointer;border-radius:9px;\"\u003eWhich system is this replacement for?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:18px;\"\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#245B45;margin:0 0 12px;\"\u003eCURRENT ITEM: DO502\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThese are selected compatible meter-system or related-workflow pages, not additional items supplied with this accessory. Match the exact probe or component in the compatibility table below.\u003c\/p\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;gap:14px;\"\u003e\n\u003ca style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:block;flex:1 1 220px;min-width:0;padding:20px;border:1px solid #B7D0BF;border-radius:8px;color:#26332C;text-decoration:none;background:white;\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-sx716-portable-polarographic-dissolved-oxygen-meter-kit\" data-meter=\"SX716\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-sx716-hero-20261016-sx700-eight.webp?v=1792171716\" alt=\"Apera SX716 Portable Dissolved Oxygen Meter Kit with DO500 Polarographic Probe\" loading=\"eager\" style=\"display:block;width:100%;max-width:105px;height:105px;object-fit:contain;margin:0 auto 14px;\"\u003e\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.05rem;font-weight:600;line-height:1.2;color:#245B45;margin:0 0 10px;\"\u003eSX716\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eRelated workflow: meter supplied with DO500\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-weight:600;text-decoration:underline;color:#245B45;\"\u003eView meter configuration\u003c\/span\u003e\u003c\/a\u003e\u003ca style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:block;flex:1 1 220px;min-width:0;padding:20px;border:1px solid #B7D0BF;border-radius:8px;color:#26332C;text-decoration:none;background:white;\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-sx725-portable-ph-dissolved-oxygen-meter-kit\" data-meter=\"SX725\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-sx725-hero-20261016-sx700-eight.webp?v=1792171716\" alt=\"Apera SX725 Portable pH and Dissolved Oxygen Meter Kit with DO500 Polarographic Probe\" loading=\"eager\" style=\"display:block;width:100%;max-width:105px;height:105px;object-fit:contain;margin:0 auto 14px;\"\u003e\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.05rem;font-weight:600;line-height:1.2;color:#245B45;margin:0 0 10px;\"\u003eSX725\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eRelated workflow: meter supplied with DO500\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-weight:600;text-decoration:underline;color:#245B45;\"\u003eView meter configuration\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eWhy choose this replacement?\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;gap:16px;\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eManufacturer-specified refill\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe DO502 product description names the DO500 polarographic electrode. The SX716 manual specifies new DO502 solution when fitting a DO503 membrane cap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003e30 mL supply\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eBoth the manufacturer product title and replacement-parts table identify a 30 mL refill.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eTraceable safety document\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe manufacturer-linked SDS identifies part number AI4112 under the name Dissolved Oxygen Electrode Reference Solution, revision 09\/01\/2026.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eCheck the exact probe and meter system.\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:100%;min-width:0;\"\u003e\u003ctable style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;table-layout:fixed;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eModel or component\u003c\/th\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eCompatibility and role\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eDO500\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible electrode. Exact compatibility stated by Apera. Do not select this polarographic refill for optical DO803 or DO810 probes.\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eOptical sensor caps and polarographic membrane components are different replacement systems. A shared brand or similar appearance does not establish interchangeability.\u003c\/p\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eRefill the membrane cap without trapping air\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eFollow section 4.5.4 of the SX716 meter manual when replacing the membrane cap. Add fresh DO502 inner solution slowly into the new DO503 cap and remove air bubbles as instructed before assembly.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eFit and tighten the cap using the manual procedure, then wipe away displaced solution and rinse the electrode. For SX716 operation, allow 30 minutes of polarization after adding new inner solution and complete the applicable calibration procedure.\u003c\/p\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eMatch the sensing system to the work.\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;gap:16px;\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eMembrane-cap servicing\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eUse fresh DO502 solution when replacing a DO503 membrane cap on the DO500 electrode.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eAir-bubble correction\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe SX716 maintenance instructions call for new inner solution when removing air bubbles from within the electrode membrane cap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eWhat this order supplies\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:100%;min-width:0;\"\u003e\u003ctable style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;table-layout:fixed;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eIncluded item\u003c\/th\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eOrder contents\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eDO502 inner solution refill\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003e1 bottle, 30 mL\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eHandle and store according to the exact-SKU SDS\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe AI4112 SDS advises avoiding eye contact and keeping the container closed, protected from direct sunlight, at room temperature of 15 to 25°C. Consult the complete SDS for first aid and handling instructions.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThis refill belongs inside the specified DO500 electrode membrane system. Follow the electrode maintenance instructions rather than treating it as a general-purpose calibration or storage solution.\u003c\/p\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:30px 0;line-height:1.2;\" id=\"bts-do502-faq\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eDO502 buyer questions\u003c\/h2\u003e\n\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhat volume is supplied?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eDO502 is supplied as a 30 mL inner solution refill.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhich electrode uses DO502?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eApera explicitly specifies the DO500 polarographic dissolved oxygen electrode.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eCan I use it with DO803 or DO810 optical probes?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThis listing is for the DO500 polarographic refill. Do not select it for DO803 or DO810 optical probes.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eIs this a calibration standard?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe manufacturer identifies DO502 as an inner solution refill, and the manual uses it inside the membrane cap. It is not presented here as a calibration standard.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eIs the SDS an exact product match?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eYes. The manufacturer-linked SDS identifies part number AI4112, titled Dissolved Oxygen Electrode Reference Solution, with revision date 09\/01\/2026.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eHow should the bottle be stored?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe SDS specifies a closed container, protection from direct sunlight and room temperature of 15 to 25°C.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhat changes after adding new solution?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eFor SX716 operation, the manual requires 30 minutes of electrode polarization after adding new inner solution, rather than the routine five-minute power-on period.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eDoes this refill include replacement membrane caps?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe DO502 listing is for the 30 mL refill. DO503 membrane caps are a separate replacement item.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Apera Instruments","offers":[{"title":"Default Title","offer_id":53007233351978,"sku":"BTS-AI4112","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do502-do502-refill-source.webp?v=1792336593","url":"https:\/\/bluetigerscientific.com\/products\/apera-do502-do-electrode-inner-solution-30ml","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}