{"product_id":"bently-nevada-991-25-50-01-05-industrial-automation-module","title":"Bently Nevada 991-25-50-01-05 Industrial Automation Module","description":"\u003ch2\u003eProduct Introduction\u003c\/h2\u003e\u003cp\u003eWhen axial thrust monitoring fails, the Bently Nevada 991-25-50-01-05 Probe Vibration Transmitter provides robust protection. This industrial module is designed for continuous, reliable measurement of axial shaft position in rotating machinery. The 991-25-50-01-05 integrates seamlessly with 3300 NSv proximity probes to deliver a linear 4-20 mA output proportional to thrust. Its Not OK\/Signal Defeat function ensures the output drops below 3.6 mA within 100 µs upon fault detection, preventing false readings and enabling rapid shutdown. This failure-aware design makes the 991-25-50-01-05 a critical component for turbine, compressor, and pump applications where unplanned downtime cannot be tolerated.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications Breakdown\u003c\/h2\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\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003e4-20 mAdc, 2-wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\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\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003eWithin ±1.5% over specified full scale range (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLinear Range\u003c\/td\u003e\n\u003ctd\u003e0.25–1.65 mm for Prox Out; suitable for 0.6-0-0.6 mm or 25-0-25 mils current loop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Loop Resistance\u003c\/td\u003e\n\u003ctd\u003e1,000 Ω including cable 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 (-31°F to +185°F)\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\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThe 991-25-50-01-05 offers non-interacting external zero and span adjustments, simplifying calibration. Its 4-20 mA loop accuracy is rated from the TEST signal input to voltage across a 250 Ω resistance, ensuring reliable data for control systems.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup Guidance\u003c\/h2\u003e\u003cp\u003eMount the Bently Nevada 991-25-50-01-05 on a 35 mm DIN rail using the provided clips (option 01). Connect one non-contacting 3300 NSv proximity probe and its extension cable to the transmitter input. Apply +12 to +35 Vdc power at the terminal. Set full-scale option -25 (25-0-25 mils) and system length -50 (5.0 meters, 16.4 feet) per your application. Verify loop resistance does not exceed 1,000 Ω. After mounting, adjust zero and span using the external potentiometers. For ATEX Zone 0\/2 or CSA Division 2 environments, confirm the agency approval option 05 covers your area classification.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003eTo maximize uptime, periodically inspect the DIN-rail mounting and cable connections. The Bently Nevada 991-25-50-01-05 features current limiting (23 mA typical) that protects the loop against overcurrent conditions. Its wide operating temperature range (-35°C to +85°C) and storage range (-51°C to +100°C) suit harsh industrial environments. The Not OK\/Signal Defeat function promptly indicates sensor or wiring faults, reducing diagnostic time. Regularly check the 4-20 mA output against a known reference to confirm accuracy stays within ±1.5%. For applications requiring ABS maritime approval, the 991-25-50-01-05 includes that certification.\u003c\/p\u003e\u003ch2\u003eTroubleshooting \u0026amp; Common Issues\u003c\/h2\u003e\u003cp\u003eIf the output remains below 3.6 mA, a Not OK condition exists—verify probe gap and cable integrity. The 991-25-50-01-05 restores normal output within 0.1 seconds after the fault clears. For erratic readings, ensure loop resistance is below 1,000 Ω and power supply is stable between +12 and +35 Vdc. If accuracy drifts, recalibrate zero and span using the non-interacting adjustments. The transmitter accepts only 3300 NSv probes; using other types may cause incorrect linearity. For persistent issues, contact PLC Source PRO for support. This module is a direct replacement for earlier thrust transmitters, offering improved fault response.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default","offer_id":44416849281123,"sku":"991-25-50-01-05","price":246.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.plcsourcepro.com\/products\/bently-nevada-991-25-50-01-05-industrial-automation-module","provider":"PLC Source PRO","version":"1.0","type":"link"}