Vibration Transmitter | 990-05-XX-02-BR 147202-01 | 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

Application Scenarios and Wiring Recommendations

Direct Connection to Industrial Control Systems: Because it directly outputs an industrial-standard 4-20mA signal, it doesn't require an expensive dedicated monitoring frame like traditional 3500 systems. It can be directly connected to the analog input cards of PLC, DCS, or SCADA systems.

In Space-Constrained Areas: The transmitter and preamplifier are integrated into one compact unit, making it ideal for direct installation in local junction boxes for compressors, pumps, and small motors.

Wiring Precautions: As the transmitter is a non-isolated device, when wiring and connecting the dynamic signal (PROX OUT) to external portable instruments, always maintain a single-point grounding to prevent ground loop interference.

Technical FAQ

Q: What is the maximum load resistance of the 4–20 mA loop in the 990-05-XX-02-BR 147202-01 transmitter?

A: At a maximum supply of 35 Vdc, the loop can drive up to 1,000 Ω (including DCS/PLC input resistance and cable impedance). At 24 Vdc, the allowable load is typically 500–600 Ω.

Q: What happens if the 4–20 mA loop of the 990-05-XX-02-BR 147202-01 is accidentally short-circuited?

A: It will not be damaged. The transmitter includes an internal over-current limiting circuit, clamping current at about 23 mA to protect both the device and the input card.

Q: Will power-up of the 990-05-XX-02-BR 147202-01 cause a surge that triggers false trips?

A: No. It includes a Power-up Inhibit function that holds the output below 3.6 mA for 2–3 seconds during startup until the circuit stabilizes.

Q: What is the measurement accuracy of the 990-05-XX-02-BR 147202-01 transmitter, and is it temperature sensitive?

A: At 25°C, accuracy is ±1.5% of full scale. Over -35°C to +85°C, total system error due to temperature drift is within ±10%.

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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