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

990-05-50-01-01 Vibration Transmitter

Product Introduction

The 990-05-50-01-01 belongs to Bently Nevada's reliable 990 series of vibration transmitters. This device accepts input from a non-contacting 3300 NSv proximity probe and then converts that signal into a standard 4-20 mA output. Therefore, it integrates seamlessly with PLCs, DCS systems, and other industrial control platforms. For vibration monitoring in rotating machinery, this transmitter provides a cost-effective solution. Pumps, fans, motors, and compressors all benefit from its precise measurement capabilities.

This particular model offers a 0-5 mils pp (0-125 μm pp) full-scale range and a 5.0-meter (16.4 feet) system length. Additionally, the "01" mounting option indicates 35 mm DIN rail clips are included. For control cabinet installation, this hardware provides secure and convenient mounting. The "01" agency approval option signifies CSA Division 2 certification, making it suitable for hazardous area installations.

Technical Specifications

The electrical performance of the 990-05-50-01-01 follows precisely defined parameters. It requires a +12 to +35 Vdc input at the transmitter terminal. In turn, it delivers a 4 to 20 mAdc output over the specified full-scale range in a 2-wire configuration. The 4-20 mA loop accuracy stays within ±1.5% over the full scale range. Specifically, we measure this accuracy from the TEST signal input to the voltage across a 250 Ω loop resistance. This error adds to the Prox Out Incremental Scale Factor, so please account for this during calibration.

The maximum loop resistance reaches 1,000 Ω, including cable, at 35 Vdc. For long-distance signal transmission, this specification provides considerable flexibility. Current limiting operates at 23 mA typical, offering protection against short circuits and overcurrent conditions. Moreover, the zero and span adjustments are non-interacting external controls. For calibration and setup, this feature simplifies the process considerably. The frequency response spans from 5 Hz to 6,000 Hz (+0, 3 dB), covering a wide range of machine vibration frequencies.

Probe Gapping Requirements

Proper probe gapping is essential for accurate measurements. The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to ensure full-scale range operation. Furthermore, the minimum target size required is 9.5 mm (0.375 inches) in diameter. For the Proximitor Sensor Output with a BNC connector, the maximum leadwire length is 3 meters (10 feet). We recommend following these guidelines carefully to achieve optimal performance.

Environmental and Safety Specifications

Understanding the environmental limits proves essential for reliable operation. The transmitter operates in temperatures from -35°C to +85°C (-31°F to +185°F) . Furthermore, it withstands storage temperatures between -51°C and +100°C (-60°F to +212°F) . This wide temperature range makes it suitable for various industrial environments. Outdoor installations and harsh process areas both benefit from this thermal resilience. The transmitter weighs 0.43 kg (0.9 lbm), which is lightweight and easy to handle during installation.

The 990-05-50-01-01 carries CSA Division 2 certification for Class I, Division 2 hazardous locations. For Zone 2 or Division 2 hazardous area locations, the recommended power supply voltage is 28 V. This certification makes this transmitter a reliable choice for oil and gas, chemical processing, and other industries where explosive atmospheres may occur.

Installation and Mounting Guide

Proper installation of the 990-05-50-01-01 ensures optimal performance and safety. The transmitter mounts on a standard 35 mm DIN rail using the included clips. First, secure the DIN rail to the mounting surface. Next, attach the clips to the transmitter housing. Then, clip the transmitter onto the rail and ensure it locks firmly in place. After that, connect the proximity probe and extension cable to the input terminals. Following that, wire the 4-20 mA output to your control system or indicator.

For field wiring, we recommend using shielded cable to minimize electromagnetic interference. The transmitter accepts input from a single non-contacting 3300 NSv proximity probe and extension cable. Meanwhile, the recommended power supply voltage is +12 to +35 Vdc at the transmitter terminal. Furthermore, we suggest performing a calibration check after installation. Using the external zero and span adjustments helps ensure accurate readings. Finally, verify that all connections are tight and properly insulated to prevent signal degradation.

Not OK/Signal Defeat Feature

The NOT OK/signal defeat feature provides critical fault indication. Signal output drops to less than 3.6 mA within 100 µs after a Not OK condition occurs. Meanwhile, the signal output restores within 2-3 seconds after the Not OK condition clears. For fault diagnostics and system safety, this rapid response proves invaluable.

Packaging List

Your shipment for the Bently Nevada 990-05-50-01-01 includes:

• 1 x 990 Vibration Transmitter (DIN rail mount)

• 1 x Mounting hardware kit (35 mm DIN rail clips)

• Installation and configuration instruction sheet

Frequently Asked Questions (FAQ)

1. What type of probe does this transmitter work with?
The 990-05-50-01-01 accepts input from a non-contacting 3300 NSv proximity probe and its associated extension cable. The system length option is 5.0 meters.

2. What is the required probe gap for this transmitter?
The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target. This ensures the full-scale range operates correctly.

3. What output signal does this transmitter provide?
This transmitter delivers a standard 4-20 mAdc output signal in a 2-wire configuration. The signal corresponds to the vibration amplitude of the monitored machine.

4. What approval does this model carry?
The "01" approval option includes CSA Division 2 certification. Therefore, it suits Class I, Division 2 hazardous locations.

5. What shipping methods are available for this item?
We ship all orders via FedEx, UPS, or DHL, depending on your location and preference. All packages are fully insured and tracked.