{"product_id":"bently-nevada-991-25-70-01-01-vibration-transmitter","title":"Bently Nevada 991-25-70-01-01 Vibration Transmitter","description":"\u003ch2\u003eBently Nevada 991-25-70-01-01 Vibration Transmitter\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 991-25-70-01-01\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e991 Thrust Transmitter\u003c\/strong\u003e, operates as a dedicated hardware component for converting proximity probe signals into a 4-20 mA axial displacement output within centrifugal compressor control systems.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eOption Code\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDescription \/ Standard Specifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e991\u003c\/td\u003e\n\u003ctd\u003eBase Model\u003c\/td\u003e\n\u003ctd\u003eThrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003eScaling\/Range\u003c\/td\u003e\n\u003ctd\u003eStandard factory calibration range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eDIN-rail or bulkhead mounting options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e01\u003c\/td\u003e\n\u003ctd\u003eInput\/System Type\u003c\/td\u003e\n\u003ctd\u003eCompatible with 3300 NSv proximity probe system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e01\u003c\/td\u003e\n\u003ctd\u003eAgency Approval\u003c\/td\u003e\n\u003ctd\u003eStandard approval rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003e991-25-70-01-01\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\u003eDimensions\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\u003eSignal Output\u003c\/td\u003e\n\u003ctd\u003e4-20 mA (Loop-powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003ePotted for high humidity resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostic Output\u003c\/td\u003e\n\u003ctd\u003eNon-isolated PROX OUT and COM terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eMechanical Monitoring \u0026amp; TSI Integration\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e991 Thrust Transmitter\u003c\/strong\u003e integrates an internal Proximitor sensor, eliminating the requirement for external signal conditioning modules. It utilizes \u003cstrong\u003eeddy-current probe scaling\u003c\/strong\u003e compatible specifically with the 3300 NSv series to measure axial shaft position. During commissioning, \u003cstrong\u003egap voltage validation\u003c\/strong\u003e is conducted via the non-isolated diagnostic terminals to confirm the probe is within the target linear operating range. The transmitter ensures \u003cstrong\u003ecross-talk suppression\u003c\/strong\u003e through fixed internal filtering, while the \u003cstrong\u003eNot OK\/Signal Defeat\u003c\/strong\u003e circuit prevents faulty transducer signals from triggering false alarms in the primary control logic.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the 991 transmitter require an external Proximitor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA: No.\u003c\/strong\u003e The transmitter features an integrated Proximitor sensor, which conditions the signal directly from the 3300 NSv probe and extension cable, reducing total hardware footprint.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How is the loop output verified during maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA: Test Input Pin.\u003c\/strong\u003e A variable DC voltage source can be applied to the Test Input pin to simulate probe proximity, allowing verification of the 4-20 mA loop response without requiring physical rotor movement.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Utilize the provided DIN-rail clips or bulkhead screws. Given the potted construction, ensure the unit is mounted in an orientation that allows access to the zero and span potentiometers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Connect the 4-20 mA loop wires to the designated terminals. Use shielded twisted-pair cabling to minimize noise, ensuring the shield is grounded at the control system end only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration:\u003c\/strong\u003e Remove the transmitter label to access zero and span potentiometers for loop adjustment. Ensure the signal is verified against the mechanical gap measurement using a digital multimeter at the PROX OUT terminal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironment:\u003c\/strong\u003e While potted for 100% condensing humidity, ensure cable entries are sealed using appropriate cable glands to maintain the environmental protection rating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #e74c3c;\"\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":44367488319587,"sku":null,"price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/2775\/3315\/files\/991-25-70-01-01-1_3c97790a-4526-4077-a244-7aee879249e7.jpg?v=1784253519","url":"https:\/\/precisemodule.com\/products\/bently-nevada-991-25-70-01-01-vibration-transmitter","provider":"Precise Module Ltd.","version":"1.0","type":"link"}