{"product_id":"bently-nevada-3500-50m-01-00-288062-02-tachometer-module","title":"Bently Nevada 3500\/50M-01-00 288062-02 Tachometer Module","description":"\u003cp\u003eThe \u003cstrong\u003e3500\/50M\u003c\/strong\u003e, full part number \u003cstrong\u003e3500\/50M-01-00\u003c\/strong\u003e (incorporating main board spare \u003cstrong\u003e288062-02\u003c\/strong\u003e), is a 2-channel hardware module designed within the 3500 Machinery Protection System to process pulse inputs from proximity probe Proximitor sensors or passive magnetic pickups to compute shaft rotative speed, rotor acceleration, or rotor direction. The instrument operates via standard 20 kΩ input impedance circuitry (40 kΩ for TMR architectures) to execute speed monitoring logic, driving dual-level alarm setpoints (Alarm 1 and Alarm 2) with independent, sub-second time delays across user-programmed configurations such as zero speed notification, speed band alarming, and reverse rotation notification. It converts physical rotor events into continuous digital variables, hosting the technical capability to synthesize and supply conditioned Keyphasor signals straight to the 3500 rack backplane for wide-system synchronicity while simultaneously delivering individual +4 to +20 mA proportional recorder currents and unconditioned front-panel coaxial buffered voltages for machine diagnostic investigations.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3500\/50M-01-00: Complete Tachometer Module Kit\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eSpecifies the combined assembly containing the main front monitor card and the designated internal termination I\/O board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-01: I\/O Module Type Option\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eI\/O Module with Internal Terminations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-00: Hazardous Area Approval Option\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eNo hazardous area agency approvals or certifications required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpares \u0026amp; Accessories\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003ePart Number \u003cstrong\u003e288062-02\u003c\/strong\u003e: Replacement 3500\/50M Tachometer Module Main Board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\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\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel \/ Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3500\/50M-01-00 (Main Board: 288062-02)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannel Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 Independent channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Signal Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+10.0 V to -24.0 V (limited internally)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard Input Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTMR Input Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40 kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal Power Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.8 W (Typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransducer Power Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VDC, 40 mA maximum per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAnalog Recorder Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+4 to +20 mA proportional to programmed full-scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecorder Load Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 to 600 Ω (0 to +12 VDC voltage compliance)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecorder Current Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.3662 µA per bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecorder Accuracy Error\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e± 0.25% at room temperature, ± 0.7% over full range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecorder Output Update Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Input Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Full Scale Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e99,999 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProximity Sensor Min Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.0167 Hz (1 rpm for 1 event per revolution)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMagnetic Pickup Min Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRPM Resolution \u0026amp; Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u0026lt; 100 rpm = ± 0.1 rpm\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e \u003c\/p\u003e\n\u003cp\u003e100 to 10,000 rpm = ± 1 rpm\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e \u003c\/p\u003e\n\u003cp\u003e10,000 to 99,999 rpm = ± 0.01% of true speed\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRotor Acceleration Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e± 20 rpm\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCombined Total Assembly Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.02 kg (0.82 kg main board + 0.20 kg internal termination I\/O)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMonitor Main Card Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e241.3 mm x 24.4 mm x 241.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eI\/O Module Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e241.3 mm x 24.4 mm x 99.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEngineering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUnder no circumstances must the 3500\/50M module be used independently or as a functional component of an active speed control loop or overspeed protection system, as it lacks the hardware redundancy and execution loop speeds required for emergency machinery trips.\u003c\/li\u003e\n\u003cli\u003ePassive magnetic pickups must not be specified for zero speed or reverse rotation notification tracking, because they fail to deliver clear wave edge pulses to the detection circuit during low-speed conditions, inducing false direction logic.\u003c\/li\u003e\n\u003cli\u003eAuto-threshold processing functions down to a minimum trigger amplitude of 1 V peak-to-peak for inputs above 0.0167 Hz, whereas manual threshold choices span +9.5 VDC to -23.5 VDC with a tighter 500 mV peak-to-peak triggering envelope.\u003c\/li\u003e\n\u003cli\u003eThe module features an active peak hold register that captures the highest forward shaft speed, highest reverse speed, and cumulative count of reverse rotations, which are retained until a manual reset command is initiated.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLand the incoming transducer field cabling shields strictly at the internal termination I\/O block ground terminal, keeping the outer shield completely ungrounded at the field sensor housing to eliminate electrical noise loops.\u003c\/li\u003e\n\u003cli\u003eWire the proportional +4 to +20 mA analog recorder outputs into separate, twisted-shielded instrumentation pairs; short circuits on these auxiliary loops will not disrupt main backplane monitoring functions.\u003c\/li\u003e\n\u003cli\u003eVerify the physical tooth count profile of the observed target gear wheel matches the event-per-revolution metric programmed in the 3500 Rack Configuration software to prevent scaling multiplication anomalies.\u003c\/li\u003e\n\u003cli\u003eRoute coaxial diagnostic lines to the front-panel buffered outputs through insulated BNC couplings to prevent accidental short-circuit grounding during routine analyzer hookups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical \u0026amp; Procurement FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 3500\/50M-01-00 directly replace a dedicated Keyphasor module within a 3500 protection rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes, the 3500\/50M can be configured to condition raw speed signals and inject them onto the rack backplane bus as standard Keyphasor pulses, making a separate Keyphasor module unnecessary for adjacent monitors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why does the front panel OK LED flash or drop out when utilizing a magnetic pickup at low turbine rotor speeds?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Passive magnetic pickups generate voltage amplitudes proportional to speed; if the rotor speed drops below 3.3 Hz, the output voltage drops below the trigger threshold, causing a sensor detection failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the physical distinction between the 288062-02 part number and the 3500\/50M-01-00 catalog designation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 3500\/50M-01-00 is the complete commercial kit number specifying the front card and specific rear I\/O board, while 288062-02 is the engineering spare part number for the main front monitor board alone.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666865746283,"sku":"3500\/50M-01-00 288062-02","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-3500-50m-01-00-288062-02-tachometer-module-qmm2dh2qs0p_d9309092-55fd-4677-82dd-c48de1e0c5da.jpg?v=1765449440","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-50m-01-00-288062-02-tachometer-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}