The Bently Nevada 990-04-70-03-CN 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.
This model carries country-specific approvals under option code CN. You can use it in regions that require local certification. 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 990-04-70-03-CN 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.
The 990-04-70-03-CN carries agency approval option CN. This means the transmitter meets local regulatory requirements for specific countries. Unlike standard ATEX or CSA versions, this model is tailored for regions with unique certification needs.
You should verify compatibility with your local safety standards before installation. For most industrial applications outside Europe and North America, the CN option provides a practical solution.
First, mount the Bently Nevada 990-04-70-03-CN 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-CN vibration transmitter (1 unit)
DIN clips and screws for mounting (set)
Product documentation and quick start guide
Shipping method: Fedex, UPS, DHL
1. What is the difference between option CN and option 05 on the Bently Nevada 990?
Option CN provides country-specific approvals tailored to local regulations. Option 05 includes CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approval. Choose based on your regional requirements.
2. Which probe works with the Bently Nevada 990-04-70-03-CN?
It accepts one non-contacting 3300 NSv proximity probe and extension cable. Do not use other probe types.
3. Can I use this transmitter in a hazardous location?
Yes, but check your local certification needs. The CN approval option meets specific country standards. For Zone 0 or Division 2 locations outside those countries, select the 05 approval option instead.
4. What happens if the probe connection fails on the 990-04-70-03-CN?
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.
5. How do I adjust the full-scale range on this model?
The full-scale option is fixed at 0-4 mils pp for the 990-04-70-03-CN. You cannot change it without ordering a different option code. Use the external zero and span adjustments for fine calibration within that range.
| Brand Name | Bently Nevada |
| Model No. | 990-04-70-03-CN |
| Product Type | Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
