The Bently Nevada 991-06-50-03-00 is a loop-powered thrust transmitter. It converts axial movement into a 4-20 mA signal. This signal connects directly to control systems. Many industries use this 991 model for critical rotating machinery. For instance, it monitors thrust position in steam turbines, centrifugal compressors, and large pumps. The 2-wire configuration simplifies wiring and reduces costs. Additionally, the 991-06-50-03-00 provides non-interacting zero and span adjustments. You can calibrate it easily without special tools.
The full-scale option is 0.6-0-0.6 mm. This matches the linear range of 0.25 mm to 1.65 mm for prox out. Loop accuracy stays within ±1.5% of full scale. Measurement is taken from the TEST signal input to a 250 Ω loop resistor. The output signal ranges from 4 to 20 mAdc. Maximum loop resistance reaches 1,000 Ω at 35 Vdc. Current limiting happens at 23 mA typical.
Power requirements remain flexible. The Bently Nevada 991-06-50-03-00 needs +12 to +35 Vdc at the terminal. Therefore, it works with most industrial power supplies. Furthermore, the Not OK/Signal Defeat feature ensures safety. When a fault occurs, the output drops below 3.6 mA within 100 µs. After the fault clears, the signal restores in under 0.1 seconds. This fast response prevents machine damage.
Operating temperature ranges from -35°C to +85°C (-31°F to +185°F). Storage temperature extends from -51°C to +100°C (-60°F to +212°F). The 991-06-50-03-00 weighs only 0.43 kg (0.9 lbm). System length is 5.0 meters (16.4 feet). The mounting option is 03, which includes DIN clips and screws. This provides a secure attachment to DIN rails.
Follow these steps for proper installation. First, mount the Bently Nevada 991-06-50-03-00 on a DIN rail using the supplied clips and screws. Next, connect one non-contacting 3300 NSv proximity probe with its extension cable. Then, wire the two-wire loop to a +12 to +35 Vdc power source. Additionally, verify the loop resistance stays below 1,000 Ω at 35 Vdc. Finally, adjust zero and span using the external potentiometers. No software is required.
Bently Nevada 991-06-50-03-00 thrust transmitter (1 unit)
DIN rail mounting clips and screws (included)
Product quick reference card
Terminal block connector (pre-attached)
Note: No calibration certificate or warranty document is included.
1. Which probe works with the Bently Nevada 991-06-50-03-00?
It accepts one non-contacting 3300 NSv proximity probe and an extension cable.
2. Can this 991 transmitter measure radial vibration?
No, the 991-06-50-03-00 is designed only for axial (thrust) monitoring.
3. What happens if the power drops below +12 Vdc?
The 4-20 mA loop may not operate correctly. Always maintain +12 to +35 Vdc.
4. How do you ship this Bently Nevada 991 transmitter?
We ship via FedEx, UPS, or DHL with full tracking and insurance.
5. What is the difference between mounting option 02 and 03?
Option 02 uses bulkhead screws. Option 03 (this model) uses DIN clips and screws for easier rail mounting.
| Brand Name | Bently Nevada |
| Model No. | 991-06-50-03-00 |
| Product Type | Probe Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
