Bently Nevada 990-10-50-03-CN Vibration Transmitter

Bently Nevada 990-10-50-03-CN Vibration Transmitter

Product Introduction

The Bently Nevada 990-10-50-03-CN is a reliable 2-wire vibration transmitter. It is designed for continuous monitoring of rotating machinery. This device accepts input from a single 3300 NSv proximity probe. Its primary function is to convert shaft vibration into a proportional 4-20 mA signal. This makes it ideal for integration into PLCs and DCS systems. Furthermore, its robust construction suits demanding industrial environments. The model 990-10-50-03-CN offers specific options for range, length, and mounting.

Key Technical Specifications

This section details the critical parameters of the Bently Nevada 990 transmitter. Understanding these ensures proper application and performance.

• Input: The unit accepts one non-contacting 3300 NSv Proximity Probe along with its extension cable.

• Power Supply: It requires a DC input voltage between +12 and +35 Vdc at the transmitter terminal.

• Signal Output: It provides a standard 4 to 20 mAdc signal over its specified full-scale range. This is a 2-wire configuration.

• Loop Accuracy: The 990-10-50-03-CN maintains loop accuracy within ±1.5%. This rating is measured from the TEST signal input across a 250 Ω load. Remember, this error is additional to the Prox Out Incremental Scale Factor.

• Frequency Response: The unit captures vibrations from 5 Hz to 6,000 Hz (+0, 3 dB). This range covers common machinery speeds.

• Current Limiting: The typical current limiting is set at 23 mA. This protects the loop from overcurrent conditions.

• NOT OK/Signal Defeat: The output drops below 3.6 mA within 100 µs of a Not OK condition. It automatically restores within 2-3 seconds after the fault clears.

Mechanical and Environmental Specifications

The physical attributes and environmental limits are crucial for installation. The 990 Vibration Transmitter is built for longevity.

• Transmitter Weight: It weighs only 0.43 kg (0.9 lbm). This lightweight design simplifies mounting.

• Mounting Option: The specific 03 option includes DIN clips and screws for secure rail mounting.

• Minimum Target Size: The probe requires a minimum target size of 9.5 mm (0.375 in) in diameter.

• Probe Gap: You must gap the probe between 0.5 and 1.75 mm (20 and 55 mils) from the target to achieve the full-scale range.

• Leadwire Length: The maximum cable distance for the Proximitor Sensor Output (BNC connector) is 3 meters (10 feet).

• Hazardous Area: This model is suitable for Non-Hazardous, Zone 2, or Div 2 hazardous area locations.

Installation and Connection Guide

Proper installation is key for the Bently Nevada 990-10-50-03-CN to function correctly. Follow these guidelines for a successful setup.

First, securely mount the transmitter using the provided DIN clips and screws. Ensure the mounting surface is stable and free from excessive vibration. Next, connect the 3300 NSv proximity probe and its extension cable to the input. Subsequently, wire the power supply to the transmitter terminals. A +12 to +35 Vdc source is mandatory.

After that, wire the 4-20 mA loop. The maximum loop resistance must not exceed 1,000 Ω at 35 Vdc. This includes all cable resistance. Finally, set the probe gap correctly. Use the non-interacting external adjustments for zero and span. This will ensure accurate measurement across the specified 0-10 mils range.

Packaging and Delivery

Your order will be carefully packaged to prevent damage during transit. All items are shipped from our warehouse promptly.

Packaging List:

• 1 x Bently Nevada 990-10-50-03-CN Vibration Transmitter

• 1 x DIN clip and screw mounting kit

• 1 x Installation guide (quick start)

Shipping: We use major couriers for reliable worldwide delivery.

• Fedex

• UPS

• DHL

Frequently Asked Questions (FAQ)

1. Can I use this with any proximity probe?
The 990-10-50-03-CN is specifically designed to work with the Bently Nevada 3300 NSv probe and its extension cable. Using other probes will affect accuracy and performance.

2. What happens if the probe cable is longer than specified?
You must keep the leadwire length to a maximum of 3 meters for the BNC connector output. Exceeding this can degrade the signal quality and violate the loop resistance limits.

3. How do I adjust the zero and span on this transmitter?
The 990 Vibration Transmitter features non-interacting external adjustments. This allows you to set the zero and span independently without affecting the other parameter.

4. Is this unit approved for use in explosive environments?
Yes, this specific CN approval option indicates it is certified for country-specific standards. It is generally suitable for Non-Hazardous, Zone 2, or Div 2 hazardous locations.

5. What is the significance of the 'System Length' option '50'?
The '50' in the model number 990-10-50-03-CN specifies a system length of 5.0 meters (16.4 feet). This refers to the total length of the probe and extension cable system.