{"product_id":"991-06-70-02-05-bently-nevada-991-series-thrust-transmitter-7-m-4-20-ma","title":"991-06-70-02-05 Bently Nevada 991 Series Thrust Transmitter – 7 m 4–20 mA","description":"\u003ch2\u003eBently Nevada 991-06-70-02-05 Thrust Transmitter\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 991-06-70-02-05\u003c\/strong\u003e is a 991 Series thrust transmitter designed for axial displacement monitoring. It accepts a compatible 3300 NSv proximity probe and extension cable and converts the measurement into a two-wire 4–20 mA DC signal for compatible PLC, DCS, and machinery monitoring systems.\u003c\/p\u003e\n\u003cp\u003eWith a 7.0 m (23.0 ft) system length and a ±0.6 mm full-scale measurement range, this transmitter supports continuous monitoring of shaft axial position in turbines, compressors, pumps, and other rotating machinery. Correct probe-system matching, loop power calculation, and signal scaling are essential for reliable measurement.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e991-06-70-02-05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.plcsparehub.com\/collections\/990-991-and-177230-transmitter\"\u003e991 Series\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eThrust Transmitter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eUSA (as specified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMeasurement\u003c\/th\u003e\n\u003ctd\u003eAxial displacement \/ thrust position\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput Signal\u003c\/th\u003e\n\u003ctd\u003e4–20 mA DC, two-wire configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFull-Scale Range\u003c\/th\u003e\n\u003ctd\u003e0.6–0–0.6 mm (±0.6 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem Length\u003c\/th\u003e\n\u003ctd\u003e7.0 m (23.0 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Probe System\u003c\/th\u003e\n\u003ctd\u003eOne 3300 NSv proximity probe and extension cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eConfirm the required mounting arrangement against the exact ordering configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupply Voltage\u003c\/th\u003e\n\u003ctd\u003e+12 to +35 V DC at the transmitter terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Loop Accuracy\u003c\/th\u003e\n\u003ctd\u003e±1.5% of specified full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum Loop Resistance\u003c\/th\u003e\n\u003ctd\u003e1,000 Ω including cable at 35 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCurrent Limiting\u003c\/th\u003e\n\u003ctd\u003e23 mA typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\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\u003cth\u003eStorage Temperature\u003c\/th\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\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.43 kg (0.9 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping Methods\u003c\/th\u003e\n\u003ctd\u003eDHL, FedEx, UPS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eConfiguration Breakdown\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe model number identifies the transmitter series and its specified ordering options.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e991 - 06 - 70 - 02 - 05\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e991\u003c\/strong\u003e — 991 Series thrust transmitter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e06\u003c\/strong\u003e — Full-scale option: 0.6–0–0.6 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70\u003c\/strong\u003e — System length: 7.0 m (23.0 ft).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e02\u003c\/strong\u003e — Ordering information specifies bulkhead screws as the mounting option.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e05\u003c\/strong\u003e — Agency approval option listed as CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approval.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eConfiguration note:\u003c\/strong\u003e The supplied information also lists DIN-rail mounting. Since this differs from the stated bulkhead-screw mounting option, verify the exact model code and manufacturer's documentation before ordering or installation. Confirm the applicable certification documents for the exact configuration, particularly for hazardous-area applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features and Engineering Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4–20 mA current-loop output:\u003c\/strong\u003e Converts the compatible proximity probe signal into a standard analog signal for compatible PLC, DCS, and machinery monitoring inputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e±0.6 mm measurement range:\u003c\/strong\u003e Supports axial displacement monitoring around a defined zero reference. Correct mechanical positioning is essential to preserve the required measurement margin.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal zero and span adjustments:\u003c\/strong\u003e Allow calibration of the measurement reference and output range during commissioning and maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot OK signal response:\u003c\/strong\u003e The specified output falls below 3.6 mA within 100 µs after a Not OK condition occurs and is restored within 0.1 seconds after the condition clears.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide DC supply range:\u003c\/strong\u003e Requires +12 to +35 V DC at the transmitter terminals. Available voltage must be checked under actual loop load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial temperature range:\u003c\/strong\u003e Operating limits of −35°C to +85°C support installation in demanding machinery environments within the specified limits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatible Equipment and Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteam and gas turbines:\u003c\/strong\u003e Axial shaft displacement trending and machinery condition monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial compressors:\u003c\/strong\u003e Monitoring axial movement where required by the machine design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial pumps:\u003c\/strong\u003e Displacement monitoring for equipment with a defined axial-position measurement requirement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGearboxes and rotating machinery:\u003c\/strong\u003e Monitoring axial position changes when the selected probe system and measurement range are suitable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePLC and DCS systems:\u003c\/strong\u003e Analog signal integration with compatible 4–20 mA input channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachinery monitoring systems:\u003c\/strong\u003e Continuous signal trending and investigation of abnormal displacement readings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility warning:\u003c\/strong\u003e This transmitter is intended for a compatible 3300 NSv proximity probe and extension cable. Do not substitute another probe family based only on connector appearance or the availability of a 4–20 mA interface.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDiagnostic Capabilities and Troubleshooting\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe transmitter converts axial displacement measurements into a current-loop signal. Its output can help maintenance engineers identify abnormal readings, but a low-current signal does not necessarily indicate an internal transmitter failure.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObserved Condition\u003c\/th\u003e\n\u003cth\u003eRecommended Checks\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput below 3.6 mA\u003c\/td\u003e\n\u003ctd\u003eCheck the Not OK condition, transmitter supply voltage, loop continuity, wiring polarity, probe, and extension cable.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStable current but incorrect displayed displacement\u003c\/td\u003e\n\u003ctd\u003eVerify zero and span, PLC\/DCS scaling, engineering units, and the configured measurement range.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFluctuating output during operation\u003c\/td\u003e\n\u003ctd\u003eInspect cable routing, loose connections, electrical interference, grounding, and actual mechanical movement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput changes when the loop load increases\u003c\/td\u003e\n\u003ctd\u003eMeasure the transmitter terminal voltage and calculate the total loop resistance, including the receiving input and cable.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation and Commissioning Guidelines\u003c\/strong\u003e\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify loop power and resistance.\u003c\/strong\u003e Measure the DC voltage at the transmitter terminals under load. Ensure the available supply voltage and total loop resistance remain within the specified limits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm the complete probe system.\u003c\/strong\u003e Check the proximity probe and extension cable part numbers, total system length, mounting arrangement, and mechanical clearance before commissioning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValidate scaling and fault handling.\u003c\/strong\u003e Confirm the 4–20 mA engineering range, zero reference, alarm thresholds, and receiving-system response to a Not OK signal. Perform fault simulation only under an approved maintenance procedure.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003e\u003cstrong\u003eGlobal PLC Spare HUB Review\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Bently Nevada 991-06-70-02-05 is a specialized option for machinery applications requiring a 4–20 mA axial displacement signal. Its suitability depends on the specified 7.0 m system length, ±0.6 mm measurement range, compatible 3300 NSv probe system, and receiving instrument requirements.\u003c\/p\u003e\n\u003cp\u003eBefore purchasing a replacement, verify the complete part number, installation arrangement, electrical loop requirements, and applicable approvals. These checks help reduce commissioning delays and prevent incompatibility between the transmitter, probe system, and control equipment.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGlobal PLC Spare HUB's Insight\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eField tip:\u003c\/strong\u003e If a replacement transmitter produces a plausible current but the DCS displays an incorrect axial displacement, check the receiving channel's scaling and zero reference before replacing additional hardware. A mismatch between the transmitter range and the configured engineering range can create misleading readings even when the current loop is functioning correctly.\u003c\/p\u003e\n\u003cp\u003eFor intermittent or low-current faults, record the transmitter terminal voltage, loop current, receiving-channel status, and probe-system part numbers. Comparing these readings helps distinguish a wiring fault, a probe-system issue, a configuration error, and a possible transmitter failure.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWarranty and Shipping\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12 months.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping:\u003c\/strong\u003e DHL, FedEx, and UPS options available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder verification:\u003c\/strong\u003e Confirm the full model code, mounting arrangement, system length, measurement range, and required approvals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTechnical support:\u003c\/strong\u003e Provide the existing part number and application details to help verify replacement compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1. What should I check if the axial displacement reading changes significantly during startup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCompare the transmitter trend with other available machinery measurements and the machine's expected startup behavior. Check mechanical clearance, probe mounting, cable routing, and electrical interference. Do not assume that a startup-related change is a transmitter fault until actual shaft movement and signal integrity have been evaluated.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2. How should I choose a replacement if the existing transmitter uses a different measurement range?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eConfirm the machine manufacturer's allowable axial movement, the required measurement margin, the probe system, and the receiving instrument's engineering scale. A replacement with a different range may require revised scaling and alarm settings. Obtain engineering approval before changing a safety- or protection-related measurement configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3. Can this transmitter connect directly to every 4–20 mA analog input?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Verify whether the receiving input is suitable for a two-wire loop, its input burden, wiring polarity, and available loop voltage. The total resistance of the cable, input channel, and any series devices must remain within the transmitter's specified limit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4. What information helps identify the cause of an intermittent low-current signal?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRecord the loop current, voltage at the transmitter terminals, controller input status, and the timing of the fault. Inspect connectors and cable continuity, and check whether the transmitter reports a Not OK condition. Correlating these observations with machine operating conditions can help isolate the fault more efficiently.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5. What should be verified before installing this transmitter in a hazardous area?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the exact model and suffix against the manufacturer's certification documents, the site's hazardous-area classification, and the approved installation design. Confirm any required associated apparatus, wiring method, and equipment approvals. Do not rely solely on a general product description to establish suitability for a specific hazardous location.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/991_524659a5-cbca-478a-b812-374d1b70ec8e.png?v=1784875246\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":45013885714614,"sku":"991-06-70-02-05","price":258.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/991_2_1c1e3fb6-8a53-4fbd-ac68-c09a240f8b25.jpg?v=1792734032","url":"https:\/\/www.plcsparehub.com\/products\/991-06-70-02-05-bently-nevada-991-series-thrust-transmitter-7-m-4-20-ma","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}