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Technical specifications for 990-04-50-02-00
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Manufacturer:Bently Nevada
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Product Category:Machinery Monitoring Systems
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Spare Part Number:990-04-50-02-00
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Estimated shipping dimensions:7.3x5x10cm
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Weight:0.44 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Full-scale Option:04 = 0-4 mil peak-to-peak (0-100 um peak-to-peak)
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System Length Option:50 = 5.0 m
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Mounting Option:02 = bulkhead screws
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Agency Option:00 = not required
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Transducer Input:One 3300 NSv proximity probe and matching extension cable
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Conditioning Stage:Integrated Proximitor
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Supply at Transmitter:+12 to +35 VDC; approval-specific circuit limits also apply
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Process Output:4-20 mADC, two-wire, proportional to configured full scale
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Loop Accuracy:Within +/-1.5% of full scale, TEST input to a 250-ohm loop
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Loop Accuracy Boundary:Additional to PROX OUT incremental scale-factor error
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Maximum Loop Resistance:1000 ohm including cable at 35 VDC
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Current Limiting:23 mA typical
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Not OK Output:Below 3.6 mA within 100 us after a Not OK condition
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Not OK Recovery:2-3 seconds after the fault condition is removed
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Power-up Inhibit:Output below 3.6 mA for 2-3 seconds
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Zero and Span:Independent external adjustments under the label
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Diagnostic Output:Non-isolated PROX OUT / COM and coaxial connector
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PROX OUT Impedance:10 kohm, calibrated for a 10 Mohm load
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PROX OUT Cable Limit:3 m maximum from the BNC diagnostic output
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Grounded Test Equipment Interface:122115-01 test adapter for signal isolation
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Transducer-system Frequency Range:5-6000 Hz
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Reference Conditions:+22 deg C, matched 3300 NSv probe/cable and AISI 4140 target
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Transmitter Operating Temperature:-35 to +85 deg C; approved-location limits may be narrower
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Transmitter Storage Temperature:-52 to +100 deg C
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Relative Humidity:100% condensing, non-submerged; protect coaxial connectors
Information
Overview
Manuals
Common Applications
Product Precautions
Bently Nevada 990-04-50-02-00 combines the four-mil transmitter span with a five-metre NSv sensing chain in a bulkhead-mounted enclosure. The resulting current loop gives a control or monitoring system a compact overall-vibration measurement.
- Sends 0-4 mil peak-to-peak overall vibration as a two-wire 4-20 mA signal.
- Matches a five-metre 3300 NSv probe-and-extension electrical chain.
- Uses the bulkhead-screw enclosure mounting supplied by option 02.
- Provides TEST input, zero/span adjustment and separate PROX OUT diagnostics.
The transmitter combines proximity-signal conditioning and loop conversion in one enclosure. Its five-metre sensor chain, receiving controller scaling and non-isolated diagnostic connection must be reviewed as one measurement path.
Important Notice: This execution selects a 5.0 m NSv chain, bulkhead screws and no agency approval. Match every transducer component and verify the actual loop before applying the signal to machinery logic.
Bently Nevada 990-04-50-02-00 Manuals & Downloads
Bently Nevada 990-04-50-02-00 Official Technical Reference (PDF)Bently Nevada 990-04-50-02-00 Installation & Commissioning Guide (PDF)
The Technical Reference organizes the exact ordering identity, applicable characteristics and system boundary for this vibration transmitter. The Installation & Commissioning Guide covers identification, pre-installation checks, connections, functional verification and the acceptance record.
Five-metre compressor channels
Feed an overall-vibration input from a matched compact-shaft NSv sensing chain.
Controller vibration trends
Provide proportional peak-to-peak amplitude to an approved machinery control input.
Bulkhead-mounted panels
Secure the transmitter where four bulkhead screws and accessible terminals suit the enclosure design.
Service diagnostics
Observe gap and dynamic waveform through PROX OUT using properly isolated test equipment.
Apply these checks to the exact Bently Nevada 990-04-50-02-00 item before returning its monitoring path to service.
1
Confirm the 04 range and matched 5.0 m NSv component chain before wiring 990-04-50-02-00.
2
Secure all four bulkhead screws without distorting the enclosure or blocking terminal access.
3
Verify polarity and voltage at the transmitter under the actual loop load.
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Keep PROX OUT isolated from grounded AC-powered instruments through the specified adapter.
5
Limit the diagnostic BNC cable to 3 m and use the specified input loading.
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Allow the startup inhibit to finish before interpreting a below-3.6 mA state as a fault.
7
Protect coaxial connectors against contamination and moisture at the installed location.
8
Complete the machine-specific functional check before enabling alarm or trip logic.
Technical notes
This execution selects a 5.0 m NSv chain, bulkhead screws and no agency approval. Match every transducer component and verify the actual loop before applying the signal to machinery logic.
FAQ View All FAQ
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What current represents full scale on 990-04-50-02-00?20 mA represents the configured 0-4 mil peak-to-peak full scale; 4 mA represents the lower endpoint under valid operating conditions.
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Which transducer length belongs with 990-04-50-02-00?Use a matched 5.0 m 3300 NSv probe-plus-extension chain.
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How is 990-04-50-02-00 fixed inside an enclosure?Option 02 supplies bulkhead screws rather than DIN-rail clips.
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Can 990-04-50-02-00 provide vibration phase through its 4-20 mA loop?No. The loop represents overall peak-to-peak amplitude; use the diagnostic output and suitable instrumentation for waveform work.
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What does a persistent output below 3.6 mA indicate on 990-04-50-02-00?It is the transmitter's Not OK behavior after the startup inhibit has ended; inspect the transducer chain and loop conditions.
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May a grounded oscilloscope connect directly to 990-04-50-02-00?Use the specified isolation adapter with grounded AC-powered test equipment because PROX OUT is not isolated from the loop.
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Which approval selection is built into 990-04-50-02-00?The final 00 means no agency-approval option is selected.
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What should be recorded when commissioning 990-04-50-02-00?Record the complete five-metre component chain, loop supply under load, zero/span result, output current and accepted machine reading.
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