990-08-70-01-01 | Bently Nevada 990 Series Transmitter

Bently Nevada 990-08-70-01-01 Vibration Transmitter

Product Introduction

The Bently Nevada 990-08-70-01-01 is a versatile 2-wire vibration transmitter. It is engineered for continuous monitoring of critical rotating equipment. This model accepts input from a single 3300 NSv proximity probe. It converts shaft vibration into a standard 4-20 mA signal for seamless integration. Its robust design ensures reliable performance in demanding industrial environments. Moreover, this version includes CSA Division 2 certification for hazardous area use.

Key Technical Specifications

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

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

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

• Signal Output: It delivers a standard 4 to 20 mAdc signal across its specified full-scale range. This uses a 2-wire configuration for simplicity.

• Loop Accuracy: The 990-08-70-01-01 maintains loop accuracy within ±1.5%. Bently Nevada rates this from the TEST signal input across a 250 Ω load. This error is additional to the Prox Out Incremental Scale Factor.

• Frequency Response: The unit captures vibration frequencies from 5 Hz to 6,000 Hz (+0, 3 dB). This covers a wide spectrum of machinery speeds.

• Current Limiting: The typical current limiting is set at 23 mA. This protects the loop wiring and connected instruments from overcurrent faults.

• 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 in harsh settings.

• Transmitter Weight: It weighs only 0.43 kg (0.9 lbm). This lightweight design simplifies mounting and reduces stress on the mounting hardware.

• Mounting Option: The specific 01 option includes 35mm DIN rail clips for standard rail mounting.

• Agency Approval: The 01 option signifies CSA Division 2 certification. This makes it suitable for use in hazardous area locations.

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

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

• 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 990-08-70-01-01 to function correctly. Follow these guidelines for a successful setup.

First, securely mount the transmitter using the provided 35mm DIN rail clips. Ensure the rail is properly grounded and stable. 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 0-8 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 990-08-70-01-01 Vibration Transmitter

• 1 x 35mm DIN rail clip 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. What is the full-scale range of the 990-08-70-01-01?
The 990-08-70-01-01 has a full-scale range of 0-8 mils pp, which is equivalent to 0-200 μm pp. This range suits many medium-speed rotating machinery applications.

2. What does the '01' agency approval option mean for this model?
The 01 option indicates CSA Division 2 certification. This allows the 990 Vibration Transmitter to be installed in hazardous area locations where explosive gases or dust may be present.

3. Can I mount this transmitter on a standard DIN rail?
Yes, this model includes the 01 mounting option which provides 35mm DIN rail clips. This makes installation quick and standardized.

4. What is the significance of the 'System Length' option '70'?
The '70' in the model number 990-08-70-01-01 specifies a system length of 7.0 meters (23.0 feet). This refers to the total length of the probe and extension cable system.

5. What happens if the probe is not gapped correctly?
The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target. Incorrect gapping will prevent the transmitter from achieving its full-scale range and may cause inaccurate readings.