Description

Bently Nevada 990-04-XX-01-CN (106M1675-01) 2-Wire Vibration Transmitter

The Bently Nevada 990-04-XX-01-CN is a high-performance, loop-powered 2-wire vibration transmitter designed to provide a 4-20 mA output proportional to radial vibration or axial position. This device integrates the signal conditioning of a Proximitor sensor directly into a compact, rail-mounted transmitter, allowing it to interface directly with Programmable Logic Controllers (PLCs) or Distributed Control Systems (DCS). By eliminating the need for separate monitor racks, the 106M1675-01 offers a cost-effective solution for machinery protection on less critical assets or where space is at a premium.

Advanced Signal Conversion and Connectivity

This transmitter is specifically engineered to work with 3300 NSv proximity probes and extension cables. Specifically, it converts the high-frequency eddy current signal from the probe into a standardized industrial current loop. Furthermore, the “CN” designation indicates that the unit is certified for use in specific regional hazardous areas, making it suitable for volatile environments in oil, gas, and chemical processing. As a result, operators can monitor shaft vibration in real-time without complex secondary hardware, facilitating immediate trend analysis and machinery health diagnostics.

Technical Specification Matrix

Industrial Utility and Predictive Maintenance

The 990-16-XX-01-CN serves as a critical link in proactive maintenance strategies for rotating equipment like small pumps, fans, and blowers. Moreover, the transmitter features a BNC connector that provides a raw “Prox Out” signal, enabling vibration technicians to perform detailed frequency analysis using portable data collectors without interrupting the 4-20 mA safety loop. In addition, the device is encapsulated to resist moisture and corrosive industrial atmospheres, ensuring long-term reliability. Therefore, this transmitter is a robust choice for facilities aiming to bridge the gap between simple machinery protection and advanced vibration diagnostics.

FAQ

What cable and probe should be used with the 990 series transmitter?

The 990 series is specifically calibrated for the 3300 NSv (Non-Standard vent) probe and extension cable. Specifically, using standard 3300 XL 8mm probes will result in inaccurate scaling. Accordingly, always verify the probe tip diameter and cable length match the transmitter’s internal calibration settings.

Is an external power supply required for the transmitter?

The unit is loop-powered, meaning it draws its operating voltage directly from the 4-20 mA signal line. Furthermore, the receiving PLC or DCS must provide the excitation voltage (typically 24 Vdc). As a result, wiring is simplified to a single twisted-shielded pair for both power and signal.

What does the “CN” suffix signify?

The “CN” designation confirms that the module is compliant with Chinese national standards for electrical equipment in hazardous locations. Consequently, it is the appropriate selection for installations requiring NEPSI or similar regional certifications for explosion-proof safety.

How is the “Prox Out” BNC port utilized?

The BNC port provides the raw vibration waveform. Ultimately, this allows a technician to connect an oscilloscope or analyzer to view the orbit, time base, or spectrum of the shaft motion, which is essential for identifying specific faults like unbalance or rub.