Vibration Transmitter | 990-05-XX-01-00 MOD: 167577-07 | Bently Nevada

Technical Specifications

The 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 transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options). 

Feature

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 Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection

On-site Maintenance Notes

Carefully Verify Total Cable Length and Probe Series: Since this is MOD 167577-07, technicians must verify the probe nameplate (e.g., 3300 XL series or other special series) and total cable length embedded in the bearing housing on-site.

PROX OUT Diagnostic Signal Phase Reminder: Following Bentley's general technical practice for MOD customized models, the PROX OUT dynamic signal phase of these specially tuned models is typically opposite to that of the standard product. If you are connecting a portable data acquisition unit for spectrum analysis on-site, it is recommended to use an isolation test adapter to prevent grounding conflicts with the two-wire circuit, which could lead to false alarms in the downstream DCS.

Technical FAQ

Q: Have the basic electrical characteristics of the 990-05-XX-01-00 MOD: 167577-07 transmitter changed?

A: No. It still uses 2-wire loop power (+12 Vdc to +35 Vdc), provides a 4–20 mA output, and includes a BNC dynamic signal output for diagnostics.

Q: Is the probe gap for the 990-05-XX-01-00 MOD: 167577-07 still 0.5 to 1.75 mm?

A: Not necessarily. Since MOD 167577 changes the calibration curve, the DC Gap Voltage and physical gap must follow the dedicated calibration report rather than the standard 1.13 mm center-gap setting.

Q: Can a standard 990-05-50-01-00 or 990-05-70-01-00 directly replace the 990-05-XX-01-00 MOD: 167577-07 transmitter?

A: No. Direct replacement can cause major errors in the 4–20 mA vibration scaling, resulting in false alarms, missed alarms, or protection failures.

Q: Can the Test Input function still be used on the 990-05-XX-01-00 MOD: 167577-07 transmitter?

A: Yes. The Test Input remains available for injecting standard test signals and verifying 4–20 mA loop performance to the DCS or PLC.

Q: Are your products brand new?
A: Yes. We only supply 100% original and brand-new products. All items are sourced through authorized channels and have never been used or refurbished.

Q: Why can customers buy with confidence?
A: Because every product is backed by our 1-Year Warranty Guarantee of Quality, ensuring reliability, customer satisfaction, and long-term support after delivery.

Q: Do you provide international shipping?
A: Yes. We ship products to customers worldwide using reliable international logistics services such as EMS, DHL, UPS, and FedEx.

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