Introduction to the 990-10-70-02-01 Vibration Transmitter
When unplanned downtime threatens production, the 990-10-70-02-01 from Bently Nevada provides a dependable solution. This 990 Vibration Transmitter converts proximity probe signals into a standard 4-20 mA loop, enabling continuous vibration monitoring. Its robust design suits non-hazardous, Zone 2 or Div 2 hazardous areas, helping you avoid costly failures.
Key Features and Technical Specifications
The 990-10-70-02-01 offers a full-scale range of 0-10 mils pp (0-250 μm pp). It accepts one non-contacting 3300 NSv Proximity Probe and extension cable. Power requirement is +12 to +35 Vdc at the transmitter terminal, with a maximum loop resistance of 1,000 Ω including cable at 35 Vdc. Current limiting is 23 mA typical, and the 4-20 mA signal output operates over the specified full-scale range in a 2-wire configuration.
- Full-scale range: 0-10 mils pp (0-250 μm pp)
- Input: 1 non-contacting 3300 NSv Proximity Probe
- Power: +12 to +35 Vdc
- Output: 4-20 mA DC
- Loop accuracy: Within ±1.5% over full-scale range
- Frequency response: 5 Hz to 6,000 Hz +0, 3 dB
- Minimum target size: 9.5 mm (0.375 in) diameter
- Weight: 0.43 kg (0.9 lbm)
These specifications directly impact cost efficiency. For instance, the 4-20 mA loop reduces wiring complexity, lowering installation costs. The ±1.5% accuracy minimizes false alarms, saving maintenance expenses.
Applications and Use Cases
In rotating machinery, the 990-10-70-02-01 monitors shaft vibration, helping detect imbalance or misalignment early. For example, in a centrifugal pump, this transmitter provides continuous data to a control system, enabling predictive maintenance. Consequently, you avoid catastrophic failures and reduce repair costs. Its compact size and bulkhead screw mounting simplify retrofits in existing panels.
Installation and Setup
Proper installation ensures accurate readings. The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target. Use the provided 7.0-meter (23.0 feet) system length for flexibility. Mount the transmitter using the bulkhead screws option. Ensure the power supply delivers +12 to +35 Vdc at the terminal. Additionally, verify the loop resistance does not exceed 1,000 Ω at 35 Vdc to maintain signal integrity.
Maintenance and Reliability
Regular inspection of the probe gap and cable connections is essential. The 990-10-70-02-01 features non-interacting external zero and span adjustments, simplifying calibration. Its current limiting at 23 mA typical protects the loop. By following the manufacturer's manual, you extend transmitter life and reduce downtime. This reliability translates to lower total cost of ownership.
Compatibility and Integration
The transmitter accepts a 3300 NSv Proximity Probe, ensuring compatibility with existing Bently Nevada systems. The 4-20 mA output integrates easily with PLCs, DCS, and SCADA systems. For hazardous areas, the CSA Division 2 approval allows installation in Zone 2 or Div 2 locations, broadening application scope.
Troubleshooting Common Issues
If the signal output drops below 3.6 mA, a Not OK condition exists. The output goes to less than 3.6 mA within 100 µs after the condition occurs, and restores within 2-3 seconds after removal. Check the probe gap and cable continuity first. Also, verify the power supply voltage is within +12 to +35 Vdc. These steps prevent costly misdiagnosis.
Product Support and Availability
The 990-10-70-02-01 is available through AutoDCSTech. Contact our team to verify current lifecycle status and availability before ordering. We provide fast, reliable service for your automation needs.
