{"product_id":"new-1pc-scanning-electron-microscope-filament-51e-0240-accessories","title":"51E-0240 Scanning Electron Microscope filament","description":"\u003c!-- Koeed Product Description: 51E-0240 SEM Filament --\u003e\n\u003cdiv style=\"font-family: 'Segoe UI', Arial, sans-serif; color: #333; line-height: 1.6; width: 100%;\"\u003e\n\n  \u003c!-- SEO Introduction --\u003e\n  \u003csection style=\"margin-bottom: 30px;\"\u003e\n    \u003ch2 style=\"color: #0056b3; border-bottom: 2px solid #16c8c8; padding-bottom: 10px;\"\u003e51E-0240 Scanning Electron Microscope (SEM) Replacement Filament\u003c\/h2\u003e\n    \u003cp\u003e\n      The \u003cstrong\u003e51E-0240\u003c\/strong\u003e is a high-performance, precision-aligned thermionic filament specifically engineered for \u003cstrong\u003eScanning Electron Microscopes (SEM)\u003c\/strong\u003e and microanalysis systems. Manufactured from premium-grade Tungsten, this pre-centered filament ensures maximum brightness and stable beam emission for high-resolution imaging.\n    \u003c\/p\u003e\n    \u003cp\u003e\n      Designed for consistent electron source reliability, the 51E-0240 minimizes downtime and reduces the frequency of source recalibration. Key industry keywords: \u003cem\u003eSEM Filament, Electron Microscope Source, 51E-0240 Tungsten Cathode, Microscopy Consumables, Electron Optics, Imaging Resolution Optimization.\u003c\/em\u003e\n    \u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Technical Specifications --\u003e\n  \u003csection style=\"margin-bottom: 30px;\"\u003e\n    \u003ch3 style=\"color: #0056b3;\"\u003eTechnical Specifications\u003c\/h3\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n      \u003ctable style=\"width: 100%; border-collapse: collapse; min-width: 600px;\"\u003e\n        \u003cthead\u003e\n          \u003ctr style=\"background-color: #16c8c8; color: white;\"\u003e\n            \u003cth style=\"padding: 12px; text-align: left;\"\u003eParameter\u003c\/th\u003e\n            \u003cth style=\"padding: 12px; text-align: left;\"\u003eTechnical Details\u003c\/th\u003e\n          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e51E-0240\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003eHigh-Purity Doped Tungsten\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u003cstrong\u003eAlignment\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003ePre-centered \/ Factory Aligned\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u003cstrong\u003eVacuum Requirement\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u0026lt; 10⁻⁵ Torr (Recommended)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003eCompatible with 1kV to 30kV acceleration\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003e\u003cstrong\u003eBase Type\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border: 1px solid #eee;\"\u003eCeramic Insulated High-Precision Base\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Application \u0026 Reliability --\u003e\n  \u003csection style=\"margin-bottom: 30px;\"\u003e\n    \u003ch3 style=\"color: #0056b3;\"\u003eApplication \u0026amp; Imaging Value\u003c\/h3\u003e\n    \u003cp\u003e\n      The \u003cstrong\u003e51E-0240 filament\u003c\/strong\u003e is the critical electron source for analytical SEM applications. In a thermionic electron gun, the stability of this filament directly impacts the \u003cstrong\u003eSignal-to-Noise Ratio (SNR)\u003c\/strong\u003e and the quality of EDX\/EDS chemical analysis. \n    \u003c\/p\u003e\n    \u003cul style=\"list-style-type: square; padding-left: 20px;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePre-Centered Accuracy:\u003c\/strong\u003e Reduces the need for mechanical gun tilt adjustments after replacement.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOptimized Brightness:\u003c\/strong\u003e Engineered for a small crossover size, providing sharper images at high magnification.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eThermal Stability:\u003c\/strong\u003e Minimizes drift during long-duration mapping or automated particle analysis sessions.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Koeed B2B Tool: Filament Life \u0026 Saturation Optimizer --\u003e\n  \u003csection style=\"margin-bottom: 30px; padding: 20px; background-color: #f0fafa; border-radius: 8px; border-left: 5px solid #16c8c8;\"\u003e\n    \u003ch3 style=\"color: #0056b3; margin-top: 0;\"\u003eKoeed FAE Tool: Filament Life \u0026amp; Saturation Calculator\u003c\/h3\u003e\n    \u003cp style=\"font-size: 0.9em;\"\u003eEstimating filament life based on heating current intensity to prevent premature burnout.\u003c\/p\u003e\n    \n    \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n      \u003clabel style=\"display: block; font-weight: bold; margin-bottom: 5px;\"\u003eHeating Current (% of Saturation):\u003c\/label\u003e\n      \u003cinput type=\"range\" id=\"heatRange\" min=\"80\" max=\"115\" step=\"1\" value=\"100\" style=\"width: 100%; cursor: pointer;\"\u003e\n      \u003cdiv style=\"display: flex; justify-content: space-between;\"\u003e\n        \u003cspan style=\"font-size: 0.8em; color: #666;\"\u003eUnder-saturated\u003c\/span\u003e\n        \u003cspan id=\"currentVal\" style=\"color: #16c8c8; font-weight: bold;\"\u003e100% (Optimal)\u003c\/span\u003e\n        \u003cspan style=\"font-size: 0.8em; color: #c62828;\"\u003eOver-heated\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background: white; padding: 15px; border-radius: 4px; display: flex; justify-content: space-around; border: 1px dashed #16c8c8;\"\u003e\n      \u003cdiv style=\"text-align: center;\"\u003e\n        \u003cspan style=\"font-size: 0.8em; color: #666;\"\u003eEstimated Life (Hours)\u003c\/span\u003e\u003cbr\u003e\n        \u003cstrong style=\"font-size: 1.3em; color: #0056b3;\"\u003e\u003cspan id=\"lifeHrs\"\u003e100\u003c\/span\u003e hrs\u003c\/strong\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"text-align: center; border-left: 1px solid #eee; padding-left: 15px;\"\u003e\n        \u003cspan style=\"font-size: 0.8em; color: #666;\"\u003eImage Noise Level\u003c\/span\u003e\u003cbr\u003e\n        \u003cstrong id=\"noiseText\" style=\"font-size: 1.3em; color: #2e7d32;\"\u003eOptimal\u003c\/strong\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cscript\u003e\n      const heatRange = document.getElementById('heatRange');\n      const currentVal = document.getElementById('currentVal');\n      const lifeHrs = document.getElementById('lifeHrs');\n      const noiseText = document.getElementById('noiseText');\n\n      function updateFilamentTool() {\n        const h = parseInt(heatRange.value);\n        currentVal.innerText = h + \"%\";\n\n        \/\/ Logic: Life decreases exponentially with overheating\n        \/\/ At 100%, life is 100 hours. At 110%, life drops to ~30 hours.\n        let life = 100 * Math.exp(-0.12 * (h - 100));\n        if (h \u003c 100) life = 120; \/\/ Lower heat doesn't exponentially increase life due to thermal cycling\n        lifeHrs.innerText = Math.round(life);\n\n        if (h \u003c 95) {\n          noiseText.innerText = \"High Noise\";\n          noiseText.style.color = \"#ef6c00\";\n        } else if (h \u003e 105) {\n          noiseText.innerText = \"Critical Heat\";\n          noiseText.style.color = \"#c62828\";\n        } else {\n          noiseText.innerText = \"Optimal\";\n          noiseText.style.color = \"#2e7d32\";\n        }\n      }\n\n      heatRange.addEventListener('input', updateFilamentTool);\n    \u003c\/script\u003e\n    \u003cp style=\"font-size: 0.75em; margin-top: 10px; color: #666;\"\u003e*Note: Calculations based on standard 10⁻⁵ Torr vacuum. Actual life depends on vacuum quality and flash cleaning frequency.\u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Troubleshooting FAQ --\u003e\n  \u003csection\u003e\n    \u003ch3 style=\"color: #0056b3;\"\u003eTroubleshooting FAQ\u003c\/h3\u003e\n    \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n      \u003cp style=\"font-weight: bold; color: #16c8c8; margin-bottom: 5px;\"\u003eQ1: The 51E-0240 filament burns out within a few hours of installation?\u003c\/p\u003e\n      \u003cp style=\"margin-top: 0; font-size: 0.95em;\"\u003eCheck your column vacuum levels. If the vacuum is worse than 5x10⁻⁵ Torr, the tungsten oxidizes and thins rapidly. Also, ensure you are not \"over-saturating\" the filament; stop increasing current the moment the beam brightness plateaus.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n      \u003cp style=\"font-weight: bold; color: #16c8c8; margin-bottom: 5px;\"\u003eQ2: Frequent \"Beam Shift\" or drift during high-magnification imaging?\u003c\/p\u003e\n      \u003cp style=\"margin-top: 0; font-size: 0.95em;\"\u003eEnsure the filament base is seated perfectly flat in the Wehnelt cylinder. Thermal expansion can cause minor mechanical shifts if the filament is not properly pre-centered or if the ceramic base has microscopic debris.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n      \u003cp style=\"font-weight: bold; color: #16c8c8; margin-bottom: 5px;\"\u003eQ3: How to clean the filament before installation?\u003c\/p\u003e\n      \u003cp style=\"margin-top: 0; font-size: 0.95em;\"\u003e\u003cstrong\u003eNEVER\u003c\/strong\u003e touch the tungsten wire or the ceramic with bare hands. Use lint-free gloves and an air blower to remove dust. If the filament has been exposed to air for a long time, perform a gradual \"bake-out\" by slowly ramping up the heating current over 10 minutes.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e","brand":"KOEED","offers":[{"title":"Default Title","offer_id":44403154747577,"sku":"186066657442","price":3130.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/51E_0240_Scanning_Electron_Microscope_filament___KOEED__1.webp?v=1775522262","url":"https:\/\/koeed.com\/id\/products\/new-1pc-scanning-electron-microscope-filament-51e-0240-accessories","provider":"KOEED","version":"1.0","type":"link"}