The Bently Nevada 991-06-50-02-00 is a high-performance thrust transmitter. It converts axial displacement into a standard 4-20 mA signal. This signal works directly with PLCs, DCS, or SCADA systems. Many plants rely on this 991 model for critical rotating machinery. Specifically, it monitors thrust position in turbines, compressors, and pumps. The device uses a 2-wire loop-powered configuration. Therefore, installation is simple and cost-effective. Additionally, the 991-06-50-02-00 includes non-interacting zero and span adjustments. These allow fine-tuning without special tools.
The transmitter offers a full-scale option of 0.6-0-0.6 mm. This matches the 991 model’s linear range from 0.25 mm to 1.65 mm for prox out. Furthermore, the loop accuracy stays within ±1.5% of the full scale. This accuracy is measured from the TEST signal input to a 250 Ω loop resistor. The output signal is 4 to 20 mAdc. Maximum loop resistance reaches 1,000 Ω at 35 Vdc. Current limiting occurs at 23 mA typical.
Power requirements are flexible. The Bently Nevada 991-06-50-02-00 needs +12 to +35 Vdc at the transmitter terminal. This wide range supports various power supplies. Moreover, the device includes a Not OK/Signal Defeat feature. When a Not OK condition happens, the output drops below 3.6 mA within 100 µs. After the fault clears, the signal restores in less than 0.1 seconds. This fast response protects your machinery from false readings.
Operating temperature ranges from -35°C to +85°C (-31°F to +185°F). Storage temperature is wider: -51°C to +100°C (-60°F to +212°F). The 991-06-50-02-00 weighs only 0.43 kg (0.9 lbm). Its system length is 5.0 meters (16.4 feet). The mounting option uses bulkhead screws. DIN rail mounting is standard. Therefore, panel space is saved.
Follow these steps for proper installation. First, mount the Bently Nevada 991-06-50-02-00 securely on a DIN rail. Next, connect a non-contacting 3300 NSv proximity probe and its extension cable. Then, wire the two-wire loop to a +12 to +35 Vdc power source. Additionally, ensure the loop resistance does not exceed 1,000 Ω at 35 Vdc. Finally, adjust zero and span using external potentiometers. No special software is needed.
Bently Nevada 991-06-50-02-00 Thrust Transmitter (1 unit)
DIN rail mounting clip (pre-installed)
Bulkhead mounting screws (included)
Product quick start guide (paper)
Note: No calibration certificate or warranty statement is included.
1. What type of probe works with the Bently Nevada 991-06-50-02-00?
It accepts a non-contacting 3300 NSv proximity probe and extension cable.
2. Can I use this 991 transmitter for radial vibration monitoring?
No, the 991-06-50-02-00 is designed for axial (thrust) monitoring only.
3. What happens if the probe fails or disconnects?
The output drops below 3.6 mA within 100 µs, indicating a Not OK condition.
4. How do I ship this Bently Nevada 991 transmitter?
We ship via FedEx, UPS, or DHL with tracking and insurance.
5. Is the 4-20 mA output isolated from the power input?
The 991-06-50-02-00 uses a 2-wire loop configuration, so the output shares the same two wires as power.
| Brand Name | Bently Nevada |
| Model No. | 991-06-50-02-00 |
| Product Type | Probe Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
