{"product_id":"bently-nevada-991-25-70-03-01-probe-vibration-transmitter","title":"Bently Nevada 991-25-70-03-01 Probe Vibration Transmitter","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Bently Nevada 991-25-70-03-01 Probe Vibration Transmitter is a critical component for axial thrust monitoring in rotating machinery. This high-reliability transmitter converts eddy-current probe signals into a 4-20 mA output proportional to shaft displacement. Built for demanding environments, the 991-25-70-03-01 ensures fail-safe operation with its Not OK\/Signal Defeat feature that drops output below 3.6 mA within 100 µs upon detection of a fault condition. Designed for B2B customers seeking precision and uptime, this module delivers consistent performance across variable temperatures from -35°C to +85°C.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\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\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eDIN rail (DIN clips and 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\u003eUse\u003c\/td\u003e\n\u003ctd\u003eAxial thrust measurement\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 terminals\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; current loop 0.6-0-0.6 mm\/25-0-25 mils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e±1.5% typical over full scale (TEST signal to 250 Ω load)\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\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-51°C to +100°C (-60°F to +212°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\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThis Bently Nevada 991-25-70-03-01 transmitter excels in axial thrust monitoring for steam turbines, centrifugal compressors, pumps, and large electric motors. In gas turbine installations, the 4-20 mA signal directly interfaces with DCS or PLC systems to trigger protective actions. Operators rely on its ±1.5% accuracy and rapid Not OK response to prevent catastrophic thrust bearing failures. The 25-0-25 mils full-scale option suits standard journal bearing clearances.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup\u003c\/h2\u003e\u003cp\u003eMount the Bently Nevada 991-25-70-03-01 on a DIN rail using the provided clips and screws. Connect one 3300 NSv proximity probe and extension cable to the input. Wire the 2-wire 4-20 mA loop to your controller, observing polarity and ensuring total loop resistance does not exceed 1,000 Ω. Power the transmitter with +12 to +35 Vdc at the terminals. Non-interacting external zero and span adjustments allow fine calibration without interaction between controls. Before commissioning, verify the linear range matches your thrust requirement (25-0-25 mils or 0.6-0-0.6 mm).\u003c\/p\u003e\u003ch2\u003eTroubleshooting \u0026amp; Common Issues\u003c\/h2\u003e\u003cp\u003eThe Bently Nevada 991-25-70-03-01 incorporates a Not OK\/Signal Defeat function that forces the output below 3.6 mA within 100 µs when a probe or internal fault is detected. This immediate current reduction triggers alarms, preventing undetected failures. If the output remains above 3.6 mA during a fault, inspect the probe and cable for damage. For offset or span drift, use the external adjustments while monitoring the loop current across a 250 Ω resistor. The transmitter automatically restores normal operation within 0.1 seconds after the fault clears. Ensure power supply voltage stays within +12 to +35 Vdc to avoid loop resistance limitations.\u003c\/p\u003e\u003ch2\u003eSelection Guide\u003c\/h2\u003e\u003cp\u003eWhen ordering a Bently Nevada 991-25-70-03-01, confirm the full-scale option (-25 for 25-0-25 mils), system length option (-70 for 7.0 meters), mounting option (03 for DIN clips and screws), and agency approval (-01 for CSA Division 2). This transmitter accepts one 3300 NSv proximity probe; ensure you have the matching extension cable. For technical inquiries or to place orders, visit PLC Source PRO (ubest101.myshopify.com) for genuine inventory and competitive pricing.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default","offer_id":44416953155683,"sku":"991-25-70-03-01","price":243.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/991-25-70-01-CN_2fcad5fe-f923-4781-a2b6-9429bcb4def7.jpg?v=1785255980","url":"https:\/\/www.plcsourcepro.com\/products\/bently-nevada-991-25-70-03-01-probe-vibration-transmitter","provider":"PLC Source PRO","version":"1.0","type":"link"}