Description
The Bently Nevada 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system. The 990 vibration transmitter is a 2-wire, loop-powered device that accepts input from Bently Nevada's 3300 NSv proximity probes and a matching extension cable (available in 5 m and 7 m system length options). The transmitter conditions the signal into appropriate peak-to-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurs.
Bently Nevada 990 Vibration Transmitter Specifications Input：Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable Power：Requires +12 to +35 Vdc input at the transmitter terminal Signal Output：4-20 mA Loop Accuracy：Within ±1.5% over specified full-scale range Probe Gap：Probe must be gapped between 0.5 and 1.75 mm from target to ensure full scale range Maximum Loop Resistance：1,000 Ω including cable at 35 Vdc Current Limiting：23 mA typical Zero and Span：Non-interacting external adjustments NOT OK/Signal Defeat：Signal output will go to less than 3.6 mA within 100 μs after a Not OK condition occurs. Signal output is restored within 2-3 seconds after the Not OK condition is removed Power-up Inhibit：Signal output stays at less than 3.6 mA for 2 to 3 seconds after power is applied Proximitor Sensor Output：Compatible with ungrounded, portable test equipment. When using grounded, ac-powered test equipment, use the 122115-01 Test Adapter for signal isolation Output Impedance：Prox Out has a 10 kΩ output impedance calibrated for a 10 MΩ load Prox Out Linear Range：1.4 mm. Begins at approximately 0.25 mm from target surface 7.87 mV/μm (200 mV/mil) ± 6.5% typical including interchangeability errors Prox Out Incremental Scale Factor：when measured in increments of 0.25 mm over the linear range using a flat 30 mm target. Worst case 7.87 mV/μm ± 10%. Typical Noise Level: 50 mV/pp Temperature Stability：Incremental scale factor remains within ±10% of 7.87 mV/μm from 0 °C to +70 °C Frequency Response：5 Hz to 6,000 Hz +0, -3 dB Minimum Target Size：9.5 mm diameter Leadwire Length：Maximum for Proximitor Sensor Output (BNC connector), maximum cable distance is 3 meters Electrical Classification：General Purpose Approval by Canadian Standards Association (CSA/NRTL/C) in North America and by VDE in Europe. 990 has the CE mark for Europe
Features
• Integrated Proximitor Sensor requires no external unit
• Non-isolated “PROX OUT" and "COM" terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics
• Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment
• Test Input pin for quick verification of loop signal output, using a function generator as the input
• A Power-up Inhibit circuit eliminates signal errors due to line voltage transients
• A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection
• Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting
• Potted construction for high humidity (up to 100% condensing) environments
• Compatibility with 3300 NSv proximity probe allows transducer installation in small areas with minimal clearance, typical of centrifugal air compressors
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers
Company advantage: Supply imported original products, professional production of spare parts
One year warranty, fast delivery time, complete supply !！！
① 24 hours email response (12 hours);
② For shipment outside Asia, please contact the seller.
【 Disclaimer 】 We sell new products and discontinued products, independent channels to buy such special products. Guizhou Yuanmiao Automation Equipment Co., Ltd. is not an authorized distributor, dealer or representative of the products featured on this website. All product names/product images, trademarks, brands and microlabels used on this Website are the property of their respective owners. Descriptions, depictions or sales of products with such names/images, trademarks, brands and logos are for identification purposes only and do not imply any association or authorization with any rights holder. This article is from the official website of Guizhou Yuanmiao Automation Equipment Co., LTD. Please attach this link:http://www.ymdcs.com/BentlyNevada/
