The Bently Nevada 990-05-70-03-CN delivers a 4-20 mA signal that represents peak-to-peak vibration displacement. Many plants use this transmitter to protect turbomachinery, compressors, and pumps. It works with a single non-contacting 3300 NSv proximity probe and extension cable.
Additionally, this device operates from a +12 to +35 Vdc loop power supply. The transmitter’s full-scale range is set to 0-5 mils pp (0-125 μm pp). You can adjust zero and span externally without interacting between the two settings.
For hazardous area locations, the Bently Nevada 990 transmitter suits non-hazardous, Zone 2, or Division 2 environments. It also includes a “NOT OK” signal defeat feature. When a fault occurs, the output drops below 3.6 mA within 100 µs. Recovery happens automatically 2-3 seconds after the fault clears.
Full-scale option: 05 = 0-5 mils pp (0-125 μm pp)
System length: 70 = 7.0 meters (23.0 feet)
Mounting option: 03 = DIN clips and screws
Approval option: CN = country-specific approvals
Input: Accepts 1 non-contacting 3300 NSv probe
Power supply: +12 to +35 Vdc at transmitter terminals
Loop accuracy: Within ±1.5% of full scale (includes 250 Ω load)
Maximum loop resistance: 1,000 Ω 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 max: 3 meters (10 feet) for Proximitor sensor output
Important probe gap requirement: The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target. This ensures the full-scale range works correctly.
The Bently Nevada 990 transmitter weighs only 0.43 kg (0.9 lbm). Its compact design allows easy installation inside panels or junction boxes. You can mount it using the included DIN clips and screws (mounting option 03).
Furthermore, the unit is made in the U.S.A. It does not require an external power supply beyond the loop power. The 4-20 mA output follows a standard 2-wire configuration.
First, mount the transmitter securely with the supplied DIN clips. Next, connect your 3300 NSv proximity probe and extension cable. The total system length is 7.0 meters (23.0 feet) for this model.
Then, apply +12 to +35 Vdc at the transmitter terminals. Ensure your loop resistance does not exceed 1,000 Ω at 35 Vdc. After powering up, gap the probe between 0.5 and 1.75 mm from the target. Finally, use the external zero and span adjustments to calibrate the 4-20 mA output.
For Proximitor sensor output with a BNC connector, keep the cable distance under 3 meters (10 feet). This maintains signal integrity and accuracy.
Bently Nevada 990-05-70-03-CN transmitter (1 unit)
DIN clips and screws for mounting (option 03)
Product documentation package (installation guide)
Note: No calibration certificate or warranty statement is included. The probe and extension cable are sold separately.
All orders ship via FedEx, UPS, or DHL. Delivery times depend on your location.
1. What is the full-scale range of the 990-05-70-03-CN?
The full-scale range is 0-5 mils pp (0-125 μm pp). This matches the “05” option code in the model number.
2. Can I use this transmitter in a hazardous area?
Yes. The Bently Nevada 990 works in non-hazardous, Zone 2, or Division 2 locations. It does not support Zone 0 or Zone 1 areas.
3. What happens if the proximity probe fails?
When a NOT OK condition occurs, the output drops below 3.6 mA within 100 µs. The signal restores automatically 2-3 seconds after the fault clears.
4. How long is the system cable for this model?
The system length option “70” means a 7.0 meter (23.0 feet) cable. This includes the probe and extension cable assembly.
5. What loop resistance can I use with a 24 Vdc supply?
For a 24 Vdc supply, calculate maximum resistance as (24V - 12V) / 20 mA = 600 Ω. At 35 Vdc, you can use up to 1,000 Ω including cable.
| Brand Name | Bently Nevada |
| Model No. | 990-05-70-03-CN |
| Product Type | Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
