{"product_id":"bently-nevada-991-25-50-01-01-probe-vibration-transmitter","title":"Bently Nevada 991-25-50-01-01 Probe Vibration Transmitter","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eWhen unplanned downtime from thrust-bearing failure threatens critical rotating machinery, the Bently Nevada 991-25-50-01-01 thrust transmitter delivers rapid fault detection to trigger protective action. This probe vibration transmitter accepts one non-contacting 3300 NSv proximity probe and outputs a proportional 4-20 mA signal over a 25-0-25 mils full-scale range. Designed for axial (thrust) measurement, it mounts on a standard 35 mm DIN rail and operates from a +12 to +35 Vdc supply. The Bently Nevada 991-25-50-01-01 includes a Not OK\/Signal Defeat feature that forces the output below 3.6 mA within 100 microseconds of a fault, and restores normal operation within 0.1 seconds after the condition clears.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cp\u003eKey parameters of the Bently Nevada 991-25-50-01-01 include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-scale Option:\u003c\/strong\u003e 25-0-25 mils\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Length:\u003c\/strong\u003e 5.0 meters (16.4 feet)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e 35 mm DIN-rail clips\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Signal:\u003c\/strong\u003e 4-20 mA, two-wire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear Range:\u003c\/strong\u003e 0.25 to 1.65 mm for Prox Out (suitable for 0.6-0-0.6 mm or 25-0-25 mils current loop linear ranges)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -35°C to +85°C (-31°F to +185°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e -51°C to +100°C (-60°F to +212°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.43 kg (0.9 lbm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Accuracy:\u003c\/strong\u003e ±1.5% over full-scale range (typical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Loop Resistance:\u003c\/strong\u003e 1,000 Ω including cable at 35 Vdc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Limiting:\u003c\/strong\u003e 23 mA typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot OK Signal:\u003c\/strong\u003e Output goes to less than 3.6 mA within 100 µs, restores within 0.1 seconds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero and Span:\u003c\/strong\u003e Non-interacting external adjustments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgency Approval:\u003c\/strong\u003e CSA Division 2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThe Bently Nevada 991-25-50-01-01 is purpose-built for axial thrust monitoring in steam turbines, gas turbines, centrifugal compressors, and large pumps. Its 4-20 mA output integrates directly with distributed control systems (DCS) and programmable logic controllers (PLC). In high-value rotating equipment, the immediate Not OK indication provided by the 991-25-50-01-01 minimizes bearing damage and reduces unplanned repair costs.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup Guidance\u003c\/h2\u003e\u003cp\u003eInstall the Bently Nevada 991-25-50-01-01 on a 35 mm DIN rail using the supplied clips. Connect a 3300 NSv proximity probe and matching extension cable to the transmitter’s input terminals. Apply +12 to +35 Vdc power, and verify the 4-20 mA output corresponds to the measured thrust gap. Adjust zero and span using the non-interacting external trimmers. Ensure the loop resistance does not exceed 1,000 Ω to maintain rated accuracy.\u003c\/p\u003e\u003ch2\u003eTroubleshooting \u0026amp; Common Issues\u003c\/h2\u003e\u003cp\u003eIf the 991-25-50-01-01 output drops below 3.6 mA, a Not OK condition exists. Common causes include probe gap out of range, cable damage, or loss of power. Check the probe gap and cable continuity first. The transmitter automatically restores output within 0.1 seconds after the fault clears. For persistent errors, verify that the supply voltage stays within +12 to +35 Vdc and that loop resistance is below the 1,000 Ω maximum.\u003c\/p\u003e\u003ch2\u003eOrdering Information Table\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eOption\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e991 Thrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull-scale Option (-25)\u003c\/td\u003e\n\u003ctd\u003e25-0-25 mils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Length Option (-50)\u003c\/td\u003e\n\u003ctd\u003e5.0 meters (16.4 feet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Option (01)\u003c\/td\u003e\n\u003ctd\u003e35 mm DIN-rail clips\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAgency Approval Option (01)\u003c\/td\u003e\n\u003ctd\u003eCSA Division 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Bently Nevada","offers":[{"title":"Default","offer_id":44416849084515,"sku":"991-25-50-01-01","price":298.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.plcsourcepro.com\/products\/bently-nevada-991-25-50-01-01-probe-vibration-transmitter","provider":"PLC Source PRO","version":"1.0","type":"link"}