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Bently Nevada 990-04-50-01-00 990 Vibration Transmitter and 122115-01 Test Adapter

Bently Nevada 990-04-50-01-00 990 Vibration Transmitter and 122115-01 Test Adapter

Item NO.: 990-04-50-01-00 122115-01
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Detail

  • Product NameBently Nevada 990-04-50-01-00 990 Vibration Transmitter and 122115-01 Test Adapter
  • Item NO.990-04-50-01-00 122115-01
  • Weight1.0000 kg = 2.2046 lb = 35.2740 oz
  • CategoryTSI
  • BrandBently Nevada
  • Creation Time2026-08-09
  • Bently Nevada 990-04-50-01-00 is a two-wire, loop-powered 4-20 mA vibration transmitter for a 5 m 3300 NSv system with 35 mm DIN-rail clips and no agency approval option. 122115-01 is the separately listed 990/991 Test Adapter used to isolate and invert PROX OUT for grounded AC-powered diagnostic equipment.
BENTLY NEVADA · 990 VIBRATION TRANSMITTER

990-04-50-01-00 / 122115-01

Two-wire 4-20 mA vibration transmitter and the separately identified 990/991 Test Adapter accessory.

Full-Scale Range0-4 mils pp (0-100 µm pp)
System Length5.0 m (16.4 ft)
Mounting35 mm DIN-rail clips
Manufacturer DocumentDatasheet 141612 Rev. Y

Product Information

The Bently Nevada 990 Vibration Transmitter is intended primarily for OEM applications on centrifugal air compressors, small pumps, motors and fans where a proportional vibration signal is required by a machinery control system. It is a two-wire, loop-powered device that accepts one 3300 NSv proximity probe and its matching extension cable.

The transmitter conditions peak-to-peak vibration amplitude and supplies an industry-standard 4-20 mA signal to the control system for alarming and logic. An integrated Proximitor Sensor, diagnostic PROX OUT, zero and span adjustments, test input and a Not OK/Signal Defeat circuit are included in the manufacturer description.

Designation control: 990-04-50-01-00 is the configured vibration transmitter. 122115-01 is a separately ordered 990/991 Test Adapter accessory. Confirm the quotation or packing list when both numbers are required in one supply package.

Manufacturer Technical Illustration

Official transmitter and probe illustration reproduced from Bently Nevada Datasheet 141612 Rev. Y is included in the product gallery.

The drawing identifies the 990 transmitter family and compatible proximity-probe arrangements; verify the complete catalog number on the nameplate before shipment.

Order Code Interpretation

Code Manufacturer-Documented Meaning Result
990 990 Vibration Transmitter family Two-wire, loop-powered vibration transmitter
04 Full-scale option 0-4 mils pp (0-100 µm pp)
50 System length option 5.0 m (16.4 ft)
01 Mounting option 35 mm DIN-rail clips
00 Agency approval option Agency approval not required
122115-01 990/991 Test Adapter Separate diagnostic accessory

Technical Data

Input One non-contacting 3300 NSv proximity probe and matching extension cable
Power +12 to +35 Vdc at the transmitter terminal
Primary Output 4-20 mAdc over the specified full-scale range, two-wire configuration
Loop Accuracy Within ±1.5% over the specified full-scale range, in addition to Prox Out scale-factor error
Probe Gap 0.5 to 1.75 mm (20 to 55 mils) from the target for full-scale range
Maximum Loop Resistance 1,000 Ω including cable at 35 Vdc
Current Limiting 23 mA typical
Not OK / Signal Defeat Output goes below 3.6 mA within 100 µs after a Not OK condition
Prox Out Linear Range 1.4 mm (55 mils), beginning at approximately 0.25 mm (10 mils) from target
Prox Out Scale Factor 7.87 mV/µm (200 mV/mil), ±6.5% typical; ±10% worst case under manufacturer test conditions
Frequency Response 5 Hz to 6,000 Hz, +0/-3 dB
Minimum Target Size 9.5 mm (0.375 in) diameter
Transmitter Operating Temperature -35 to +85 °C (-31 to +185 °F)
Transmitter Storage Temperature -52 to +100 °C (-62 to +212 °F)
Humidity 100% condensing, non-submerged, with coaxial connectors protected
Transmitter Weight 0.43 kg (0.9 lbm); typical complete system 0.82 kg (1.8 lbm)

122115-01 Test Adapter

The manufacturer lists 122115-01 as the 990/991 Test Adapter. The package includes the adapter, a 9 V battery, universal AC adapter, North American power cord, user guide and soft carrying case.

  • Isolates the 990 transmitter PROX OUT signal from grounded AC-powered diagnostic equipment.
  • Inverts the PROX OUT signal to match the standard Bently Nevada Proximitor Sensor polarity convention.
  • Supports two channels so an XY probe configuration can be displayed as an orbit.
  • Is strongly recommended by the manufacturer when AC-powered test equipment is connected.

Applications and System Integration

Centrifugal Compressors
Compact proximity measurement for OEM installations.
Small Pumps and Motors
Overall peak-to-peak vibration trending.
Fans
4-20 mA input to PLC, DCS or other machinery logic.
Diagnostic Verification
PROX OUT used with isolated equipment or 122115-01.

Functional limitation: the 4-20 mA signal provides overall peak-to-peak vibration trending but does not provide vibration phase, gap alarm, phase alarm, Timed OK channel defeat, Danger Bypass or Trip Multiply functions. It is not a substitute for a plant-wide dynamic diagnostic system.

Installation and Compatibility Requirements

  • System matching: use a 3300 NSv proximity probe and extension cable that together match the 5.0 m system-length option.
  • Range: the receiving control channel must be scaled for 0-4 mils peak-to-peak (0-100 µm pp).
  • Mounting: option 01 is for 35 mm DIN-rail clips; a bulkhead-screw-only installation is a different catalog option.
  • Approvals: suffix 00 means agency approval is not required. Do not use this exact configuration where certified hazardous-area approval is mandatory.
  • Diagnostics: connect battery-powered or isolated equipment directly to PROX OUT. Use 122115-01 for grounded AC-powered equipment.
  • Target: manufacturer performance data is based on an AISI 4140 steel target under the stated test conditions.

Lifecycle and Replacement

Current manufacturer status: Bently Nevada Datasheet 141612 Rev. Y, copyright 2026, continues to list the 990 transmitter family, exact ordering option 990-04-50-01-00 and accessory 122115-01.

Discontinuation date: no discontinuation date is stated in the current public manufacturer datasheet.

Replacement model: the current public datasheet does not publish a direct replacement for this exact configuration. Another 990 code is not automatically interchangeable unless full-scale range, system length, mounting, approval, power, loop loading, probe system and installation conditions are all confirmed. The 991 is a thrust transmitter and is not a direct replacement for the 990 vibration transmitter.

Frequently Asked Questions

1. What does 990-04-50-01-00 mean?
It specifies the 990 vibration-transmitter family, 0-4 mils pp full scale, 5.0 m system length, 35 mm DIN-rail clips and no required agency approval.
2. Is 122115-01 part of the transmitter itself?
No. The manufacturer lists it separately as the 990/991 Test Adapter. Confirm that both catalog numbers are included when a combined supply is required.
3. What is the primary output?
A two-wire 4-20 mAdc signal proportional to peak-to-peak vibration over the selected full-scale range.
4. Which probe system is compatible?
The 990 accepts one Bently Nevada 3300 NSv proximity probe and matching extension cable.
5. What power supply is required?
The transmitter requires +12 to +35 Vdc at its terminals.
6. When is the 122115-01 Test Adapter required?
Use it when connecting grounded, AC-powered diagnostic equipment to PROX OUT so the signal is isolated and its polarity is inverted.
7. Is option 00 suitable for hazardous areas?
Option 00 means agency approval is not required. Select and verify the appropriate certified option for any hazardous-area installation.
8. Can the 990 replace a full machinery protection system?
No. It provides practical overall vibration trending and loop alarming but does not provide all functions of a continuous dynamic monitoring system.
9. Can a 991 transmitter replace this 990?
No. The 991 is intended for thrust or axial-displacement measurement, while the 990 is a vibration transmitter.
10. Has this exact product been discontinued?
The current manufacturer datasheet continues to list it and states no discontinuation date. Confirm current orderability at quotation time.

Additional Bently Nevada Models from Supplied Stock List

The following 30 catalog numbers were selected from the customer-supplied Bently Nevada stock list and are different from the 30 numbers used on the preceding product page. They are availability references only; no technical equivalence or substitution is implied.

01990-04-XX-01-05
02990-05-70-03-CN
03990-04-50-01-01
04990-04-50-02-01
05990-04-50-03-00
06990-05-50-03-00
07990-05-50-03-01
08990-05-70-01-00
09990-05-70-02-05
10990-05-XX-03-00
11990-08-XX-01-00
12990-08-XX-02-05
13990-08-XX-03-00
14990-10-XX-02-01
15991-06-70-03-01
163500/15-05-05-00
17330930-040-05-00
18330930-040-02-CN
19330930-040-04-00
20330930-040-05-05
21330930-040-05-CN
22330930-045-03-00
23330930-060-00-00
24330930-065-00-00
25330930-065-00-05
26330930-065-00-CN
27330930-065-05-05
28330930-045-05-CN
2974712-06-10-02-00
3074712-06-05-03-00
Data control: Technical statements on this page are based on Bently Nevada 990 Vibration Transmitter Datasheet 141612 Rev. Y. Catalog selection, approvals and accessory scope must be validated for the actual installation and purchase order.

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