Bently Nevada 990-10-50-01-00 Vibration Transmitter

Product Introduction

The Bently Nevada 990-10-50-01-00 offers a practical approach to vibration monitoring. This 990 Vibration Transmitter works seamlessly with the 3300 NSv Proximity Probe system. It translates shaft vibration data into a standard 4-20 mA current loop signal. Therefore, it integrates easily into existing PLC and DCS systems. The unit is manufactured in the U.S.A. and reflects Bently Nevada's engineering expertise.

Specifically, the 990-10-50-01-00 provides a full-scale range of 0-10 mils pp (0-250 μm pp). This broader range suits applications with higher vibration amplitudes. Moreover, its design incorporates non-interacting zero and span adjustments. This feature simplifies field calibration without affecting other settings. The transmitter's robust construction ensures long-term reliability in various industrial settings.

Technical Specifications

Performance and Measurement

The 990-10-50-01-00 generates a 4 to 20 mAdc signal across its specified full-scale range. It operates in a standard 2-wire configuration, simplifying wiring requirements. Furthermore, loop accuracy is within ±1.5% over the full scale. This accuracy rating is measured from the TEST signal input. The voltage is measured across a 250 Ω loop resistance. The ±1.5% error is in addition to the Prox Out Incremental Scale Factor. For example, this precision supports effective machine condition monitoring. The unit also includes a "NOT OK" signal defeat feature. If a fault is detected, the output drops below 3.6 mA within 100 µs. The signal automatically recovers within 2-3 seconds after the fault clears.

Power and Electrical Characteristics

This model requires a +12 to +35 Vdc power input at the transmitter terminal. Consequently, the maximum loop resistance is 1,000 Ω, including cable, at 35 Vdc. The typical current limiting is set to 23 mA for protection. Meanwhile, the frequency response ranges from 5 Hz to 6,000 Hz (+0, 3 dB). This wide bandwidth captures fundamental vibration frequencies and some harmonics. Additionally, the transmitter accepts one non-contacting 3300 NSv Proximity Probe and extension cable. This compatibility ensures easy integration with existing probe systems.

Physical and Environmental

The Bently Nevada 990-10-50-01-00 weighs approximately 0.43 kg (0.9 lbm). Its compact size facilitates installation in crowded control cabinets. For instance, the system length option is 5.0 meters (16.4 feet). The mounting option features 35 mm DIN rail clips for quick and secure attachment. This DIN rail configuration reduces installation time significantly. Furthermore, this model carries the "00" agency approval option, indicating no hazardous area certifications are required. It is therefore suitable for non-hazardous locations. The minimum target size needed is 9.5 mm (0.375 in) in diameter. This makes it adaptable to various shaft sizes.

Installation Guidelines

Proper installation of the 990 Vibration Transmitter ensures accurate and reliable measurements. First, mount the unit onto a standard 35 mm DIN rail using the included clips. The clips provide a secure and vibration-resistant fit. Next, set the probe gap between 0.5 and 1.75 mm (20 and 55 mils) from the target. This gap is essential for achieving the full-scale range. Then, connect the power supply with +12 to +35 Vdc. Remember that the maximum leadwire length for the Proximitor Sensor Output (BNC connector) is 3 meters (10 feet). Finally, use the external adjustments to set zero and span without interaction. These straightforward steps ensure optimal performance.

Packaging List

The product package includes the following items:

• Bently Nevada 990-10-50-01-00 Vibration Transmitter (1 unit)

• 35 mm DIN rail mounting clips (attached)

• Product documentation and quick-start guide

Please note: The proximity probe, extension cable, and power supply are not included and must be purchased separately.

Frequently Asked Questions (FAQ)

1. What is the full-scale range of the 990-10-50-01-00?
The Bently Nevada 990-10-50-01-00 has a full-scale range of 0-10 mils pp, equivalent to 0-250 μm pp. This range suits applications with higher vibration levels.

2. What mounting option does this model feature?
This transmitter uses the "01" mounting option, which consists of 35 mm DIN rail clips. This allows for fast and secure installation in control panels.

3. What is the required power supply for this device?
The 990-10-50-01-00 requires a DC input voltage between +12 and +35 Vdc at the transmitter terminal.

4. Does this transmitter have hazardous area approvals?
No, this model carries the "00" agency approval option, which means it is intended for use in non-hazardous locations only.

5. What is the maximum loop resistance for this transmitter?
The maximum loop resistance is 1,000 Ω, including the cable, at 35 Vdc. This ensures compatibility with most control systems.