{"product_id":"991-06-50-02-00-bently-nevada-990-991-series-vibration-transmitter","title":"991-06-50-02-00 Bently Nevada 990\/991 Series Vibration Transmitter","description":"\u003cp\u003eConfigured for casing vibration monitoring, the \u003cstrong\u003eBently Nevada 991-06-50-02-00\u003c\/strong\u003e (\u003cstrong\u003e991-06-50-02-00\u003c\/strong\u003e Vibration Transmitter) provides direct electrical execution for signal conditioning and 4-20 mA loop transmission.\u003c\/p\u003e\n\u003ch3\u003eModel Configuration Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e991: Base Model (Vibration Transmitter)\u003c\/li\u003e\n\u003cli\u003e06: System length configuration\u003c\/li\u003e\n\u003cli\u003e50: 5.0 meters system length\u003c\/li\u003e\n\u003cli\u003e02: Bulkhead screw mounting option\u003c\/li\u003e\n\u003cli\u003e00: No additional requirements\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003e991-06-50-02-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.44 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e10 x 7.5 x 5.2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-35 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e+12 to +35 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoop Resistance\u003c\/td\u003e\n\u003ctd\u003e1,000 Ohm max at 35 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Limiting\u003c\/td\u003e\n\u003ctd\u003e23 mA typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eMechanical Monitoring and Signal Integrity\u003c\/h3\u003e\n\u003cp\u003eThe 991 transmitter employs precise eddy-current probe scaling to convert sensor proximity data into a linear 4-20 mA output. Installation requires gap voltage validation (targeted at -10 VDC) to ensure the transducer system operates within the linear range of the rotor dynamics envelope. The device architecture incorporates cross-talk suppression to maintain signal fidelity in environments where multiple transmitters are installed in close proximity. Non-interacting adjustments allow for field calibration of the zero and span points, ensuring accurate representation of machinery vibration across the specified measurement band.\u003c\/p\u003e\n\u003ch3\u003eOrdering Info\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x 991-06-50-02-00 Vibration Transmitter\u003c\/li\u003e\n\u003cli\u003e1 x Bulkhead mounting screw hardware set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower Supply: Connect a DC source within the 12-35 VDC range to the transmitter terminals; ensure proper polarity to prevent damage to internal circuitry.\u003c\/li\u003e\n\u003cli\u003eMounting: Secure the transmitter using the provided bulkhead screws in an environment free from excessive moisture and corrosive vapors.\u003c\/li\u003e\n\u003cli\u003eGrounding: Terminate the signal cable shield to a common system ground to mitigate EMI and noise accumulation on the 4-20 mA loop.\u003c\/li\u003e\n\u003cli\u003eLoop Integrity: Ensure total loop resistance, including cable, does not exceed 1,000 Ohm at 35 VDC to maintain loop current control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the primary function of the 23 mA current limiting?\u003c\/p\u003e\n\u003cp\u003eThis safety feature limits current during fault conditions or loop shorts, protecting the internal transmitter components and downstream instrumentation from damage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan this transmitter be calibrated without removing it from service?\u003c\/p\u003e\n\u003cp\u003eThe zero and span adjustments are external and non-interacting, allowing for calibration while the transmitter is powered and loop-connected.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the system length (5.0 m) affect the signal frequency response?\u003c\/p\u003e\n\u003cp\u003eYes, the total system length includes the probe, extension cable, and transmitter; the frequency response is factory-tuned for this specific configuration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat happens if the input voltage drops below 12 VDC?\u003c\/p\u003e\n\u003cp\u003eOperation below the minimum 12 VDC threshold may cause output signal instability or complete loss of transmitter function.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow is the transmitter output impacted by load resistance?\u003c\/p\u003e\n\u003cp\u003eExceeding the maximum 1,000 Ohm load resistance at 35 VDC will result in a drop in loop current, preventing the transmitter from reaching the full span output.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs this transmitter compatible with legacy 3300 series probes?\u003c\/p\u003e\n\u003cp\u003eCompatibility is generally maintained within the Bently Nevada 990\/991 ecosystem; verify probe series matching via technical manuals for specific impedance curves.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAre shielding requirements strictly dependent on the cable length?\u003c\/p\u003e\n\u003cp\u003eShielding is required for all installation lengths to ensure RFI\/EMI immunity, specifically when operating near high-frequency industrial radio equipment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhy is bulkhead mounting specified for this model?\u003c\/p\u003e\n\u003cp\u003eBulkhead mounting provides structural stability and grounding continuity, reducing mechanical vibration stress on the transmitter housing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":46026788339885,"sku":"991-06-50-02-00","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/991-06-50-01-01_2_5.jpg?v=1783407040","url":"https:\/\/www.maxwellplc.com\/ga\/products\/991-06-50-02-00-bently-nevada-990-991-series-vibration-transmitter","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}