The Bently Nevada 990-04-70-03-05 is a 2-wire vibration transmitter. It accepts input from one non-contacting 3300 NSv proximity probe. This device provides a 4-20 mA signal proportional to vibration amplitude.
You can use it in hazardous locations. It carries CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approvals. The full-scale option is set to 0-4 mils peak-to-peak (0-100 μm).
Additionally, the system length option is 7.0 meters (23.0 feet). The mounting option includes DIN clips and screws. Therefore, installation becomes simple and secure.
The Bently Nevada 990 transmitter requires a DC power supply. Input voltage ranges from +12 to +35 Vdc at the terminal. The maximum loop resistance is 1,000 Ω at 35 Vdc, including cable resistance.
Current limiting happens at 23 mA typically. The 4-20 mA loop accuracy stays within ±1.5% over the full-scale range. Bently Nevada rates this accuracy from the TEST signal input to the voltage measured across a 250 Ω load.
The frequency response spans 5 Hz to 6,000 Hz (+0, -3 dB). The minimum target size is 9.5 mm (0.375 inches) in diameter. Moreover, the probe gap must be set between 0.5 and 1.75 mm (20 to 55 mils) from the target. This ensures the full-scale range works properly.
Zero and span adjustments are non-interacting and external. You can fine-tune them without special tools. The NOT OK/signal defeat feature forces the output below 3.6 mA within 100 µs after a fault. Signal recovery happens within 2-3 seconds after the NOT OK condition clears.
This Bently Nevada 990 transmitter weighs 0.43 kg (0.9 lbm). It is made in the U.S.A. The leadwire length for the Proximitor Sensor Output (BNC connector) has a maximum distance of 3 meters (10 feet).
The operating environment includes non-hazardous areas and Zone 2 or Division 2 hazardous locations. For those areas, use a 28 V power supply. The unit’s rugged housing protects against typical industrial vibration and dust.
First, mount the Bently Nevada 990-04-70-03-05 using the included DIN clips and screws. Ensure the mounting surface is flat and stable. Next, connect the 3300 NSv proximity probe and extension cable. The total system length is 7.0 meters.
Then, apply power between +12 and +35 Vdc. Do not exceed 35 Vdc. After that, gap the probe between 0.5 and 1.75 mm from the target. Use the external zero and span adjustments to calibrate the 4-20 mA output.
Finally, verify the loop resistance stays below 1,000 Ω. For best accuracy, use a 250 Ω resistor for voltage measurement. The signal output will automatically go to <3.6 mA if a NOT OK condition occurs.
Bently Nevada 990-04-70-03-05 vibration transmitter (1 unit)
DIN clips and screws for mounting (set)
Product documentation and quick start guide
Shipping method: Fedex, UPS, DHL
1. What probe works with the Bently Nevada 990-04-70-03-05?
It accepts one non-contacting 3300 NSv proximity probe and extension cable. Do not use other probe types.
2. Can I use this transmitter in a Zone 0 hazardous area?
Yes. The agency approval option 05 includes ATEX Zone 0, ATEX Zone 2, CSA Division 2, and ABS maritime approval.
3. What happens if the probe connection fails?
The NOT OK/signal defeat will force the output below 3.6 mA within 100 µs. The signal returns 2-3 seconds after normal operation resumes.
4. How do I adjust the full-scale range?
The full-scale option is fixed at 0-4 mils pp for this model (990-04-70-03-05). You cannot change it without ordering a different option code.
5. What is the maximum cable length from the Proximitor output?
The maximum distance is 3 meters (10 feet) for the Proximitor Sensor Output using a BNC connector. Longer cables may degrade signal quality.
| Brand Name | Bently Nevada |
| Model No. | 990-04-70-03-05 |
| Product Type | Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
