{"product_id":"138700-01-shaft-absolute-i-o-module-bently-nevada-3500-42","title":"138700-01 Shaft Absolute I\/O Module Bently Nevada 3500\/42","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Bently Nevada 138700-01 is a specialized Shaft Absolute Input\/Output (I\/O) module designed for integration with the 3500\/42M Proximitor Seismic Monitor. This module is engineered to facilitate the \"Shaft Absolute\" vibration measurement, which combines shaft relative vibration (from proximity probes) and bearing housing absolute vibration (from seismic transducers). By performing this vector summation, the 138700-01 provides a comprehensive view of the shaft's motion relative to free space, rather than just the bearing clearance. This data is vital for high-precision monitoring of large turbomachinery where the casing itself may be subject to significant motion.\u003c\/p\u003e\n\u003ch3\u003eHardware Architecture and Engineering Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 138700-01 serves as the rear-mount termination point for field wiring, providing the necessary signal conditioning and galvanic isolation for complex vibration loops.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Identification:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e138700-01\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Function:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eShaft Absolute Vibration I\/O\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTransducer Interface:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupports simultaneous input from Proximitor sensors and Accelerometers\/Velocity sensors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eChannel Density:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e4-channel capacity when paired with the 3500\/42 monitor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Processing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eReal-time vector addition of relative and seismic signals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eI\/O Type:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eInternal Terminations (standard)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUnit Weight:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e0.84 kg\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Dimensions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2.6 cm x 24.2 cm x 24.1 cm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e-30°C to +65°C (-22°F to +149°F)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAPI 670 Standard for Machinery Protection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Origin:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUSA\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStrategic Industrial Deployment\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHeavy-Duty Gas Turbines:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEssential for monitoring shaft behavior in gas turbines where casing vibration must be compensated for to understand true rotor dynamics.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHydroelectric Generators:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUsed to track absolute shaft displacement in large-scale vertical and horizontal hydro units where structural vibration is prevalent.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNuclear Steam Turbines:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eProvides high-integrity data for safety-critical monitoring, ensuring that shaft excursions are detected independently of bearing pedestal movement.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLarge Pump Trains:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIdeal for high-energy pumps in water transmission or oil transport where absolute motion detection prevents seal and coupling failures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePredictive Maintenance Programs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFeeds accurate waveform data to diagnostic software for identifying resonance, unbalance, and misalignment in rotating assets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary purpose of the \"Shaft Absolute\" measurement facilitated by the 138700-01?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: It provides the \"true\" vibration of the shaft by subtracting or adding the vibration of the bearing housing. This ensures that if the entire machine is shaking, you can still distinguish how the shaft is moving relative to a fixed point in space.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this I\/O module work as a standalone unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the 138700-01 is an I\/O interface. It must be installed in the rear of a 3500 rack directly behind a 3500\/42 or 3500\/42M monitor module to function.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this module support 3300 XL Proximitor sensors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes, it is fully compatible with the 3300 XL transducer series as well as standard velocity and acceleration transducers used for seismic measurements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the 138700-01 module hot-swappable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: While the 3500 rack supports the physical removal of I\/O modules while powered, doing so will disconnect the field sensors from the monitor, which will likely trigger a \"Rack Not OK\" status and potentially trip the machinery if interlocks are active.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this differ from a standard 3500\/42 I\/O module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Standard I\/O modules typically process either proximity OR seismic signals. The 138700-01 is specifically wired and circuited to handle both signal types simultaneously for the Shaft Absolute calculation.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":45847653548205,"sku":"3500\/42 138700-01","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/128031-01-1_18ece8a6-ee0e-4125-8ec5-d5403e3261aa.jpg?v=1774494916","url":"https:\/\/www.maxwellplc.com\/products\/138700-01-shaft-absolute-i-o-module-bently-nevada-3500-42","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}