Introduction to the 990-10-70-01-00 Vibration Transmitter
When rotating machinery vibration threatens uptime, the 990-10-70-01-00 from Bently Nevada provides a reliable measurement solution. This 990 series vibration transmitter converts proximity probe signals into a standard 4-20 mA output for seamless integration with control systems.
Designed for industrial environments, the 990-10-70-01-00 accepts one non-contacting 3300 NSv Proximity Probe and extension cable. Its compact form factor and DIN rail mounting simplify installation in existing panels.
Key Features and Technical Specifications
The 990-10-70-01-00 delivers precise vibration monitoring with several notable specifications:
- Full-scale range: 0-10 mils pp (0-250 μm pp) – covers typical machinery vibration levels.
- System length: 7.0 meters (23.0 feet) – matches standard probe cable runs.
- Mounting: 35 mm DIN rail clips – quick, secure panel installation.
- Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
- Power: Requires +12 to +35 Vdc input at the transmitter terminal.
- Output: 4-20 mAdc over full-scale range in 2-wire configuration.
- Accuracy: Within ±1.5% over specified full-scale range (from TEST signal input to voltage across 250 Ω loop resistance).
- Maximum loop resistance: 1,000 Ω including cable at 35 Vdc.
- Current limiting: 23 mA typical.
- Frequency response: 5 Hz to 6,000 Hz +0, 3 dB.
- Minimum target size: 9.5 mm (0.375 in) diameter.
- Leadwire length: Maximum 3 meters (10 feet) for Proximitor Sensor Output (BNC connector).
These parameters ensure accurate vibration data for predictive maintenance and machine protection.
Performance and Reliability
The 990-10-70-01-00 offers robust performance in demanding conditions. Its 4-20 mA loop output is compatible with most PLCs, DCSs, and SCADA systems. The transmitter features non-interacting external zero and span adjustments, simplifying calibration.
Signal integrity is maintained with a NOT OK/signal defeat function: the output drops to less than 3.6 mA within 100 µs after a Not OK condition, and restores within 2-3 seconds after the condition clears. This fast response protects downstream equipment from false readings.
With a maximum loop resistance of 1,000 Ω at 35 Vdc, the transmitter can drive long cable runs without signal degradation. The 23 mA typical current limiting prevents damage to the loop.
Installation and Setup
Mounting the 990-10-70-01-00 is straightforward using the included 35 mm DIN rail clips. Ensure the probe is gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to achieve full-scale range. This gap is critical for accurate measurement.
Power the transmitter with +12 to +35 Vdc at the terminal. Connect the 3300 NSv probe and extension cable to the input. The 2-wire 4-20 mA output connects to your control system. Verify the loop resistance does not exceed 1,000 Ω at 35 Vdc.
For hazardous area installations, the transmitter is rated for NonHazardous, Zone 2, or Div 2 locations with a 28 V power supply. Always follow the manufacturer's manual for specific wiring and safety guidelines.
Maintenance and Troubleshooting
Regular inspection of the probe gap and connections ensures consistent performance. Periodically verify the output signal against a known vibration source. If the output goes below 3.6 mA, check for a Not OK condition or probe fault.
If the transmitter does not respond, verify power supply voltage and loop wiring. Confirm the probe is properly gapped and the target is within the minimum size of 9.5 mm diameter. For persistent issues, consult the Bently Nevada documentation or contact AutoDCSTech for support.
Availability and Support
The 990-10-70-01-00 is available from AutoDCSTech. Contact our team for current stock and lead times. We provide industrial automation parts with fast shipping and responsive support.
