{"product_id":"21000-28-05-00-105-04-02-bently-nevada-proximity-probe-housing","title":"21000-28-05-00-105-04-02 Bently Nevada Proximity Probe Housing","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e21000-28-05-00-105-04-02\u003c\/strong\u003e is an API 670 compliant, explosion-proof proximity probe housing assembly engineered by Bently Nevada. Designed for hostile industrial machinery environments, this assembly provides sealed enclosure protection for reverse-mount 3300 XL 8 mm proximity probes used in continuous vibration, shaft position, and axial displacement monitoring systems.\u003c\/p\u003e\n\u003cp\u003eConstructed from die-cast aluminum with a 304 stainless steel sleeve, the \u003cstrong\u003e21000-28-05-00-105-04-02\u003c\/strong\u003e modular housing allows external probe penetration adjustments without removing main machine casing covers. It carries CSA Type 4 ratings and intrinsically safe approvals for Class I, Division 1 and 2 hazardous locations.\u003c\/p\u003e\n\u003ch3\u003eConfiguration Breakdown: 21000-28-05-00-105-04-02\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Housing Model:\u003c\/strong\u003e 21000 — Aluminum Body with 304 Stainless Steel Sleeve\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e[28] Probe Option:\u003c\/strong\u003e 3300 XL 8 mm Reverse Mount Probe (Hazardous Area Approved)\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e[05] Cable Length:\u003c\/strong\u003e 0.5 meter (20 inches) Miniature Coaxial Cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e[00] Standoff Adapter:\u003c\/strong\u003e No Standoff Adapter Included (Direct NPT Mounting)\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e[105] Probe Penetration Depth:\u003c\/strong\u003e 10.5 inches (266.7 mm) Sleeve Length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e[04] Fitting Option:\u003c\/strong\u003e One 3\/4-14 NPT Conduit Plug Installed\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e[02] Mounting Thread Option:\u003c\/strong\u003e 3\/4-14 NPT External Process Connection Thread\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Specifications \u0026amp; Structural Parameters\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #0056b3; color: #ffffff;\"\u003e\n\u003cth style=\"text-align: left; width: 35%;\"\u003eEngineering Attribute\u003c\/th\u003e\n\u003cth style=\"text-align: left; width: 65%;\"\u003eDesign Specification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer \u0026amp; Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada 21000 Series API 670 Probe Enclosures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e21000-28-05-00-105-04-02\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnclosure Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eChromate-treated Aluminum Housing with 304 Stainless Steel Probe Sleeve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal Transducer Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3300 XL 8 mm Eddy Current Proximity Probe (Reverse Mount Type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntegrated Cable Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5 Meter (20 Inches) Coaxial Cable with ClickLoc Connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSleeve Penetration Depth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.5 Inches (266.7 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProcess Connection Thread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3\/4-14 NPT External Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConduit Entry Ports\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3\/4-14 NPT Port with One Heavy-Duty Plug Installed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNet Physical Assembly Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.1 kg (2.4 lbs) Typical (Excluding External Conduit Fittings)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnvironmental Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCSA Type 4 \/ IP66 Equivalent Weatherproof Seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHazardous Area Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCSA Class I Div 1\/2 Groups C, D; Class II Div 1\/2 Groups E, F, G; Class III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eT5 @ Ta = -50°C to +40°C; T4 @ Ta = -50°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard Compliance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAPI 670 Standard 5th Edition Compliant; RoHS Directive 2011\/65\/EU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCross-Model Specification Comparison \u0026amp; Technical Selection\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; width: 25%;\"\u003eConfiguration Parameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; width: 37.5%;\"\u003eCurrent Model: 21000-28-05-00-105-04-02\u003c\/th\u003e\n\u003cth style=\"text-align: left; width: 37.5%;\"\u003eAlternate Option: \u003ca href=\"https:\/\/www.plcsparehub.com\/products\/21000-16-05-15-072-03-02-bently-nevada-proximity-probe-assembly\" target=\"_blank\"\u003e21000-16-05-15-072-03-02\u003c\/a\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransducer Probe Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3300 XL 8 mm Reverse Mount Probe (Option 28)\u003c\/td\u003e\n\u003ctd\u003e3300 8 mm Reverse Mount Probe (Option 16)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandoff Adapter Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo Standoff Adapter \/ Direct NPT Mount (Option 00)\u003c\/td\u003e\n\u003ctd\u003e1.5 Inch (38.1 mm) Standoff Adapter Included (Option 15)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePenetration Depth (C)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.5 Inches (266.7 mm) Sleeve Length\u003c\/td\u003e\n\u003ctd\u003e7.2 Inches (182.8 mm) Sleeve Length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConduit Fitting Option\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOne 3\/4-14 NPT Plug Only (Option 04)\u003c\/td\u003e\n\u003ctd\u003eOne 3\/4-14 NPT Plug + Cable Gland Assembly (Option 03)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3\/4-14 NPT External Process Thread (Option 02)\u003c\/td\u003e\n\u003ctd\u003e3\/4-14 NPT External Process Thread (Option 02)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eSelection Engineering Guidance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Generation Matching:\u003c\/strong\u003e Select the target unit based on your Proximitor sensor architecture. Option 28 (3300 XL) delivers linear extended scale performance and enhanced EMI immunity compared to legacy Option 16 (3300) transducers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Clearance Calculations:\u003c\/strong\u003e Option 00 provides direct surface thread engagement for deep machine insertion (10.5 in). If external clearance between the machine wall and structural steel is constrained, select models with standoff adapters such as the \u003ca href=\"https:\/\/www.plcsparehub.com\/products\/21000-16-05-15-072-03-02-bently-nevada-proximity-probe-assembly\" target=\"_blank\"\u003e21000-16-05-15-072-03-02\u003c\/a\u003e to offset the outer dome housing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTarget Machinery \u0026amp; Industrial Field Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPI 612 Steam Turbines:\u003c\/strong\u003e Thrust position and radial vibration tracking on high-pressure casing glands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal Gas Compressors:\u003c\/strong\u003e Shaft displacement surveillance on high-speed hydrocarbon barrel compressors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoiler Feed Pumps:\u003c\/strong\u003e Continuous axial rotor position feedback under high ambient humidity and temperature cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInduced Draft Fans \u0026amp; Blowers:\u003c\/strong\u003e Machinery protection loops operating in Class I, Division 1 hazardous process gas areas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostic Integration \u0026amp; Mechanical Integrity\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInternal sleeve design protects delicate coaxial cable runs against physical abrasion, oil saturation, and flying mechanical debris.\u003c\/li\u003e\n\u003cli\u003eAdjustable reverse-mount probe threaded sleeve permits precise target gap setting (typically -9.00 VDC or 1.0 mm baseline gap) prior to sealing the outer dome cover.\u003c\/li\u003e\n\u003cli\u003eO-ring body seal structure retains CSA Type 4 isolation, preventing moisture ingress into the conduit header during high-pressure washdown cycles.\u003c\/li\u003e\n\u003cli\u003eCompatible with TK-3 3-Channel optical gap verification tools and digital voltmeters connected to 3300 XL Proximitor sensor diagnostic terminals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eIn high-vibration machinery installations, incorrect installation of the 21000 sleeve center-lock nut can lead to false thrust displacement trip alarms. The probe sleeve must be rigid within the machine shell tap; any axial play in the 304 stainless steel tube will mimic rotor movement to the 3300 XL eddy current sensor, shifting the DC gap voltage outside the calibrated -9.00 VDC baseline window.\u003c\/p\u003e\n\u003cp\u003eDuring an overhaul on an offshore compressor deck, field technicians reported erratic vibration spikes on a 10.5-inch sleeve assembly. Diagnostic analysis using a dial indicator showed that thermal expansion on the long unguided 10.5-inch sleeve caused mechanical resonance at operating speeds. Installing a midpoint dampening bushing and re-torquing the 3\/4-14 NPT thread seal restored mechanical stability, eliminating false vibration signals and maintaining continuous 24\/7 protection.\u003c\/p\u003e\n\u003ch3\u003eLogistics, Delivery \u0026amp; Warranty Policy\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Quality:\u003c\/strong\u003e Supplied as 100% genuine Bently Nevada hardware in original factory packaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Assurance:\u003c\/strong\u003e Backed by a full 12-month factory-grade replacement warranty starting from dispatch date.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpress Global Courier:\u003c\/strong\u003e Worldwide expedited priority shipment handled via FedEx, UPS, and DHL Express.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDispatch Lead Time:\u003c\/strong\u003e Factory inventory items ship within 24 to 48 hours following order confirmation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Selection FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the total probe sleeve penetration calculated when ordering a 21000 housing assembly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMeasure the distance from the outer surface of the machine mounting boss to the target shaft face, factoring in required probe gap clearance. Match this total depth directly to the suffix code (e.g., 105 represents 10.5 inches of internal penetration).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan a 3300 XL probe with a 0.5-meter cable be extended directly to a remote monitor cabinet?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, the 0.5-meter probe cable must connect to a matching 3300 XL extension cable and 3300 XL Proximitor sensor. The total combined length of probe plus extension cable must equal exactly 5.0 meters or 9.0 meters according to Proximitor tuning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary benefit of selecting an aluminum body housing over stainless steel options?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe aluminum body (21000) provides lightweight structural protection and superior heat dissipation at a lower cost, suitable for standard API 670 installations. Stainless steel housings (24701) are recommended primarily for highly corrosive marine environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do technicians reset probe gap voltage without disassembling the entire housing body?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUnscrew the outer dome cover, loosen the internal sleeve lock nut, and rotate the reverse-mount sleeve assembly using precision hand tools while monitoring the Proximitor output DC voltage until the target voltage (e.g., -9.00 VDC) is reached.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat maintenance procedure should be followed when replacing an internal probe in a hazardous zone?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEnsure loop power to the Proximitor sensor is isolated or verify the area is non-hazardous. Remove the housing dome cover, disconnect theClickLoc coaxial connector, loosen the sleeve retaining nut, and back out the reverse-mount probe without disturbing main process piping.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/21000_CA21000_Proximity_Probe_Housing_Assembly_007eb544-fd00-4b41-a22e-c953629fa721.png?v=1784785784\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":45014024814774,"sku":"21000-28-05-00-105-04-02","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/21000-28-05-20-050-03-02_ec34a626-dead-424c-9208-b5569c8bdfea.jpg?v=1788426927","url":"https:\/\/www.plcsparehub.com\/products\/21000-28-05-00-105-04-02-bently-nevada-proximity-probe-housing","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}