Bently Nevada 991-06-50-02-01 Thrust Transmitter

Bently Nevada 991-06-50-02-01 Thrust Transmitter

Product Introduction

The Bently Nevada 991-06-50-02-01 converts proximity probe signals into a standard 4-20 mA output. This transmitter specifically monitors axial thrust position in rotating machinery. It works with a non-contacting 3300 NSv proximity probe and extension cable. Many users prefer the Bently Nevada 991-06-50-02-01 because it mounts easily on a DIN rail. Its 4-20 mA loop output integrates directly with PLCs, DCS, and SCADA systems. Furthermore, this model has a full-scale option of 0.6-0-0.6 mm. The system length is 5.0 meters (16.4 feet). Additionally, it uses bulkhead screws for mounting.

Technical Specifications

The Bently Nevada 991-06-50-02-01 requires a +12 to +35 Vdc input at the transmitter terminal. Its linear range for proximity output is 0.25 to 1.65 mm. This range suits a 0.6-0-0.6 mm or 25-0-25 mils current loop linear range. The 4 to 20 mA output operates over the specified full-scale range in a 2-wire configuration. Loop accuracy is within ±1.5 percent over the full scale range, typical. This accuracy is rated from the TEST signal input to the voltage measured across a 250 ohm loop resistance. Maximum loop resistance is 1,000 ohm including cable at 35 Vdc. Current limiting is 23 mA typical. Zero and span adjustments are non-interacting and external.

Signal and Safety Features

This transmitter includes a Not OK or Signal Defeat function. The signal output will go to less than 3.6 mA within 100 µs after a Not OK condition occurs. Signal output restores within 0.1 seconds after the Not OK condition is removed. Therefore, the Bently Nevada 991-06-50-02-01 provides reliable fault indication. This feature prevents false readings during system faults. It also ensures safe operation in critical machinery monitoring.

Environmental Limits and Mounting

For transmitter temperature, the operating range is -35°C to +85°C (-31°F to +185°F). Storage temperature ranges from -51°C to +100°C (-60°F to +212°F). The Bently Nevada 991-06-50-02-01 weighs 0.43 kg (0.9 lbm). It mounts on a standard DIN rail for easy installation. Bulkhead screws are the mounting option for this model. The agency approval option is CSA Division 2, making it suitable for hazardous locations.

Frequently Asked Questions (FAQ)

1. What probe works with the Bently Nevada 991-06-50-02-01?
   This transmitter accepts a non-contacting 3300 NSv proximity probe and its extension cable. Do not use other probe types.

2. Can I use this transmitter in a hazardous area?
   Yes, the agency approval option 01 is CSA Division 2. Therefore, the Bently Nevada 991-06-50-02-01 is suitable for such locations.

3. How do I know if the probe fails?
   The Not OK function forces the output below 3.6 mA within 100 µs. This gives you a clear fault indication.

4. What is the maximum loop resistance?
   Maximum loop resistance is 1,000 ohm including the cable at 35 Vdc. Exceeding this may cause inaccurate readings.

5. Does the Bently Nevada 991-06-50-02-01 require special tools for setup?
   No, zero and span adjustments are external and non-interacting. You only need a standard screwdriver and a multimeter.