{"product_id":"bently-nevada-3300-50-3300-system-tachometer-monitor","title":"Bently Nevada 3300\/50 3300 System Tachometer Monitor","description":"\u003ch2\u003eBently Nevada 3300\/50 3300 System Tachometer Monitor\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 3300\/50\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e3300\/50\u003c\/strong\u003e Tachometer Monitor, operates as a dedicated hardware component for measuring shaft rotative speed, rotative acceleration, or zero speed indication within Bently Nevada 3300 Machinery Monitoring platforms. The single-channel instrument accepts electrical pulse inputs from up to two separate speed transducers, executing internal voting logic to ensure precise speed measurements and protective alerting while minimizing the risk of false trips in the event of a single sensor failure.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3300\/50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.1 x 20.3 x 30.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 to +65 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 kOhm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDuty Cycle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 percent minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTo 95 percent, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eMachinery Monitoring \u0026amp; TSI Features\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 3300\/50\u003c\/strong\u003e executes real-time speed tracking and acceleration calculations to detect machine overspeed or underspeed states. Designed for rotor dynamics monitoring, the module operates as an integral part of Turbine Supervisory Instrumentation (TSI), supporting Keyphasor proximity probe inputs or magnetic pickup sensors. To suppress high-frequency signal cross-talk across the 3300 backplane, the tachometer uses internal hardware filters that isolate pulse-train trigger signals from sensitive analog vibration channels. The module supports zero speed indication to prevent early turning gear engagement and ensures correct gap voltage validation when utilizing proximity-type speed sensors.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the dual-transducer voting logic operate within this single-channel monitor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 3300\/50 continuously monitors the health (OK status) of both speed transducers. If both sensors are functioning normally, the monitor compares their pulse rates. If one transducer fails (e.g., due to an open\/short circuit), the internal voting logic automatically switches to the remaining healthy transducer, preventing a false zero-speed trip or loss of speed indication.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What types of analog and digital outputs are provided on the rear terminal block?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The rear terminal block provides a proportional DC voltage or current output (typically representing rotative speed or acceleration) for transmission to strip chart recorders, DCS, or PLC systems. Additionally, it provides discrete Alert and Danger relay contacts for integration into external machinery protection or alarm annunciator loops.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Threshold Tuning:\u003c\/strong\u003e Set the trigger threshold levels (hysteresis) to match the voltage swing of the field transducers (such as magnetic pickups or proximity sensors) to prevent false double-triggering on shaft surface irregularities or electrical noise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Grounding Rules:\u003c\/strong\u003e Terminate the shield wires of both speed sensors strictly at the dedicated grounding terminals on the rear Signal Input\/Relay Module. Keep the shield isolated and ungrounded at the sensor end to avoid ground loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeyphasor Alignment:\u003c\/strong\u003e When using proximity probes for speed triggering, ensure the physical probe aligns precisely with the center of the shaft keyway or projection, verifying that the nominal probe gap voltage sits within the linear calibration zone.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #e74c3c;\"\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":44356310138979,"sku":null,"price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/2775\/3315\/files\/3300-50-01-01-00-00-2.jpg?v=1784009111","url":"https:\/\/precisemodule.com\/products\/bently-nevada-3300-50-3300-system-tachometer-monitor","provider":"Precise Module Ltd.","version":"1.0","type":"link"}