{"product_id":"bently-nevada-991-25-50-02-01-industrial-automation-module","title":"Bently Nevada 991-25-50-02-01 Industrial Automation Module","description":"\u003ch2\u003eProduct Introduction\u003c\/h2\u003e\u003cp\u003eThe Bently Nevada 991-25-50-02-01 Thrust Transmitter is a precision Probe Vibration Transmitter engineered for axial position monitoring in critical rotating machinery. As part of the Bently Nevada 991 series, this unit converts proximity probe signals into a 4-20 mA output for seamless integration with control systems. Designed for reliability, it features a Not OK\/Signal Defeat function that forces the output below 3.6 mA within 100 µs upon fault detection—a critical safety feature for preventing undetected failures.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications Breakdown\u003c\/h2\u003e\u003cp\u003eThe Bently Nevada 991-25-50-02-01 delivers accurate axial position data under demanding conditions. Below are key parameters derived from the product datasheet:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull-scale Option\u003c\/td\u003e\n\u003ctd\u003e25-0-25 mils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Length\u003c\/td\u003e\n\u003ctd\u003e5.0 meters (16.4 feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eDIN rail, Bulkhead screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003e4-20 mA (2-wire)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLinear Range (Prox Out)\u003c\/td\u003e\n\u003ctd\u003e0.25 to 1.65 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirement\u003c\/td\u003e\n\u003ctd\u003e+12 to +35 Vdc at transmitter terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoop Accuracy\u003c\/td\u003e\n\u003ctd\u003e±1.5% typical over full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Loop Resistance\u003c\/td\u003e\n\u003ctd\u003e1,000 Ω 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\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-35°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-51°C to +100°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.43 kg (0.9 lbm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAgency Approval\u003c\/td\u003e\n\u003ctd\u003eCSA Division 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThese specifications ensure accurate and reliable axial thrust measurement in hazardous environments.\u003c\/p\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThe Bently Nevada 991-25-50-02-01 is ideal for axial position monitoring in steam turbines, compressors, and large pumps. In a typical turbine application, the transmitter accepts a single non-contacting 3300 NSv proximity probe and cable, converting the gap voltage into a proportional 4-20 mA signal. The CSA Division 2 approval allows installation in areas with flammable gases or vapors. The Not OK\/Signal Defeat feature provides immediate fault indication, reducing downtime in critical processes.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup Guidance\u003c\/h2\u003e\u003cp\u003eMount the Bently Nevada 991-25-50-02-01 on a standard DIN rail using the provided bulkhead screws. Connect the 3300 NSv proximity probe via the 5.0-meter extension cable. Power the transmitter with +12 to +35 Vdc at the terminal—ensure polarity is correct. The 4-20 mA output connects in a 2-wire configuration to your PLC or DCS. Calibrate zero and span using the non-interacting external adjustments. For optimal performance, keep loop resistance below 1,000 Ω and avoid exposing the transmitter beyond its -35°C to +85°C operating range.\u003c\/p\u003e\u003ch2\u003eTroubleshooting \u0026amp; Common Issues\u003c\/h2\u003e\u003cp\u003eThe primary failure mode addressed by the Bently Nevada 991-25-50-02-01 is a loss of signal due to probe damage or electrical faults. The Not OK\/Signal Defeat circuit forces the output below 3.6 mA within 100 µs of detecting a fault. This rapid response prevents false readings that could lead to catastrophic turbine overspeed or thrust bearing damage. Once the fault is cleared, the output restores within 0.1 seconds. If the output remains low, check the probe gap, cable integrity, and supply voltage. The current limiter (23 mA typical) protects against short circuits. Regular inspection of probe and cable connections is recommended to maintain accuracy.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default","offer_id":44416869105763,"sku":"991-25-50-02-01","price":280.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.plcsourcepro.com\/products\/bently-nevada-991-25-50-02-01-industrial-automation-module","provider":"PLC Source PRO","version":"1.0","type":"link"}