Product Introduction
When vibration measurement accuracy is critical for rotating machinery protection, the Bently Nevada 990-08-70-03-CN 990 Vibration Transmitter delivers reliable performance. This industrial automation module accepts one non-contacting 3300 NSv Proximity Probe and extension cable, converting vibration signals into a standard 4 to 20 mA output. Designed for continuous monitoring, the Bently Nevada 990-08-70-03-CN ensures early fault detection and reduced downtime.
Key Technical Specifications
The Bently Nevada 990-08-70-03-CN 990 Vibration Transmitter provides precise measurements with the following parameters:
-
Full-Scale Range: 0-8 mils pp (0-200 μm pp)
-
4-20 mA Loop Accuracy: Within ±1.5% over full-scale range
-
Frequency Response: 5 Hz to 6,000 Hz (+0, 3 dB)
-
Power Supply: +12 to +35 Vdc input
-
Maximum Loop Resistance: 1,000 Ω at 35 Vdc
-
Current Limiting: 23 mA typical
-
System Length Option: 7.0 meters (23.0 feet)
-
Mounting Option: DIN clips and screws
Industrial Applications
The Bently Nevada 990-08-70-03-CN 990 Vibration Transmitter is ideal for monitoring vibration in turbines, compressors, pumps, and fans. With a minimum target size of 9.5 mm (0.375 in) diameter and probe gap requirements of 0.5 to 1.75 mm, it reliably measures shaft displacement. Its NOT OK/signal defeat feature ensures rapid detection of faults, making it suitable for critical machinery protection loops.
Installation and Setup Guide
Mount the Bently Nevada 990-08-70-03-CN using DIN clips or screws. Connect a 3300 NSv Proximity Probe and extension cable; leadwire length from the Proximitor Sensor Output (BNC connector) must not exceed 3.0 meters (10 feet). Ensure the probe gap is between 0.5 and 1.75 mm from the target. Power the transmitter with +12 to +35 Vdc at the terminal. Adjust zero and span using the non-interacting external controls.
Troubleshooting and Common Issues
The Bently Nevada 990-08-70-03-CN includes a signal defeat mechanism that forces output below 3.6 mA within 100 µs after a Not OK condition, restoring within 2-3 seconds after removal. Verify loop resistance does not exceed 1,000 Ω at 35 Vdc. If output is inaccurate, check probe gap and supply voltage. PLC Source PRO stocks this module at ubest101.myshopify.com.