The Bently Nevada 991-06-50-01-01 is a loop-powered thrust transmitter with CSA Division 2 certification. This approval makes it suitable for hazardous industrial environments. It converts axial thrust movement into a reliable 4-20 mA signal. Many facilities choose this 991 model for compressors, turbines, and pumps in classified areas. For instance, oil refineries and chemical plants benefit from its safety rating. The 2-wire configuration simplifies installation. Additionally, the 991-06-50-01-01 offers non-interacting zero and span adjustments. You can calibrate it easily without decoupling the loop.
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 occurs 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 is 23 mA typical.
Power requirements are flexible. The Bently Nevada 991-06-50-01-01 needs +12 to +35 Vdc at the terminal. Therefore, it works with most industrial power supplies. Furthermore, the Not OK/Signal Defeat feature enhances 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 false readings in critical processes.
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 991-06-50-01-01 weighs only 0.43 kg (0.9 lbm). System length is 5.0 meters (16.4 feet). The mounting option is 01, which includes 35 mm DIN-rail clips. This ensures a secure and standard attachment.
This transmitter holds agency approval option 01: CSA Division 2. Use it in locations where explosive gases or dusts are present only under abnormal conditions. This certification expands application possibilities. Meanwhile, the electrical specifications remain identical to the standard 991 series. Always follow local installation codes for hazardous areas.
Follow these steps for proper installation. First, mount the Bently Nevada 991-06-50-01-01 on a 35 mm DIN rail using the supplied clips. 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 for basic setup.
Bently Nevada 991-06-50-01-01 thrust transmitter (1 unit)
35 mm DIN-rail clips (included, pre-attached)
Product installation leaflet
Terminal block connector
Note: No calibration certificate or warranty document is included.
1. Where can I use the Bently Nevada 991-06-50-01-01?
Use it in CSA Division 2 hazardous locations. Examples include oil refineries and chemical plants.
2. Which probe works with this 991 transmitter?
It accepts one non-contacting 3300 NSv proximity probe and an extension cable.
3. What is the difference between approval option 00 and 01?
Option 00 has no agency approval. Option 01 (this model) carries CSA Division 2 certification.
4. Can this 991-06-50-01-01 measure radial vibration?
No, it is designed only for axial (thrust) monitoring. Use a different sensor for radial.
5. How do you ship this Bently Nevada transmitter?
We ship via FedEx, UPS, or DHL with full tracking and insurance.
| Brand Name | Bently Nevada |
| Model No. | 991-06-50-01-01 |
| Product Type | Probe Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
