Bently Nevada 990-05-50-01-00 Vibration Transmitter

Bently Nevada 990-05-50-01-00 Vibration Transmitter

Product Introduction

The Bently Nevada 990-05-50-01-00 serves as a compact, 2-wire vibration transmitter for continuous machinery monitoring. This device accepts input from one non-contacting 3300 NSv proximity probe and its matching extension cable. It then converts the dynamic vibration signal into a proportional 4-20 mA analog output. This loop-powered design greatly simplifies installation because it eliminates separate power and signal lines. Consequently, users experience reduced wiring complexity and lower overall system costs. This particular model features a full-scale range of 0-5 mils pp (0-125 μm pp) along with a 5.0-meter system length. Therefore, it proves ideal for OEMs of centrifugal air compressors, small pumps, motors, and fans.

Technical Specifications

Measurement and Output Performance

This transmitter delivers a 4 to 20 mAdc signal across its specified full-scale range using a 2-wire configuration. The loop accuracy reaches within ±1.5% over the full-scale range. This accuracy rating derives from the TEST signal input to the voltage measured across a 250 Ω loop resistance. Moreover, this ±1.5% error exists in addition to the Prox Out Incremental Scale Factor. The frequency response spans from 5 Hz to 6,000 Hz (+0, 3 dB) . Thus, it ensures reliable detection of vibration events across a broad spectrum of rotational speeds.

Power Requirements and Electrical Characteristics

The device requires a +12 to +35 Vdc input at the transmitter terminal for proper operation. The maximum loop resistance reaches 1,000 Ω , including cable resistance, at 35 Vdc. Typical current limiting occurs at 23 mA to protect the circuit from overcurrent conditions. Additionally, this transmitter incorporates a NOT OK/signal defeat function. When a Not OK condition occurs, the signal output drops to less than 3.6 mA within 100 µs. The output then restores to normal levels within 2-3 seconds after the condition clears. Zero and span adjustments use non-interacting external potentiometers, which make calibration straightforward and convenient.

Probe Compatibility and System Integration

The Bently Nevada 990-05-50-01-00 works seamlessly with 3300 NSv proximity probes and their corresponding extension cables. The minimum target size measures 9.5 mm (0.375 in) in diameter for reliable detection. For the Proximitor Sensor Output featuring a BNC connector, the maximum leadwire length extends to 3 meters (10 feet). The transmitter weighs just 0.43 kg (0.9 lbm) , making it lightweight and easy to handle during installation. This model also includes Option 01, which provides 35 mm DIN rail mounting clips for secure attachment. Furthermore, the probe must maintain a gap between 0.5 and 1.75 mm (20 and 55 mils) from the target to ensure accurate full-scale range operation.

Mechanical and Environmental Specifications

The 990-05-50-01-00 delivers reliable performance across various industrial environments. Its Agency Approval Option is 00, indicating that formal agency approvals are not required for this configuration. Nevertheless, this device remains suitable for Non-Hazardous, Zone 2, or Div 2 hazardous area locations. For such installations, the device requires a 28 V power supply to meet safety requirements. The compact DIN rail mounting design saves valuable panel space. In addition, its robust construction withstands typical industrial vibration and temperature conditions.

Installation and Configuration Guidelines

Proper installation ensures accurate measurements and long-term reliability. First, mount the transmitter onto a standard 35 mm DIN rail using the included clips. Next, connect the device to your 3300 NSv proximity probe system carefully. Ensure that the total probe length combined with the extension cable length matches the 5.0-meter (16.4 feet) system length option. For field wiring, connect the transmitter in a 2-wire, loop-powered configuration while observing correct polarity (+ and -). We recommend using a three-conductor shielded triad cable for optimal noise immunity and signal integrity. Finally, adjust the probe to the recommended gap setting of 1.0 mm (40 mils) . Meanwhile, verify that this gap stays within the 0.5 to 1.75 mm linear range. After completing the mechanical installation, proceed with zero and span adjustments using the external potentiometers. Apply a known reference signal to the TEST input and adjust until the output matches the desired values.

Packaging List

• 1 x Bently Nevada 990-05-50-01-00 Vibration Transmitter

• 1 x 35 mm DIN rail clip (pre-installed)

• 1 x 3/4-14 NPT plug

Shipping Information

All orders ship via FedEx, UPS, or DHL to guarantee fast and secure worldwide delivery. Each transmitter receives careful packaging to prevent damage during transit.

Frequently Asked Questions (FAQ)

1. What full-scale range does this transmitter offer?
The 990-05-50-01-00 model provides a full-scale range of 0-5 mils pp (0-125 μm pp) . The suffix '05' in the product number identifies this specific configuration.

2. Which probes work with this transmitter?
This device accepts one non-contacting 3300 NSv Proximity Probe along with its matching extension cable. No other probe types are compatible.

3. How does this transmitter receive power?
It operates as a loop-powered 2-wire device requiring a DC input voltage between +12 and +35 Vdc at the transmitter terminal. The power comes directly from the current loop.

4. What happens to the output during a fault condition?
During a Not OK condition, such as an open probe circuit, the signal output drops to less than 3.6 mA within 100 µs. This rapid response provides clear fault indication to the monitoring system.

5. Where do people typically apply this transmitter?
The Bently Nevada 990-05-50-01-00 finds common use in continuous vibration monitoring of general-purpose rotating equipment. Typical applications include centrifugal pumps, electric motors, and industrial fans .