Bently Nevada 991 Thrust Transmitter (Model: 991-06-70-01-05)

The Bently Nevada 991 Thrust Transmitter (Model: 991-06-70-01-05) is designed specifically for applications requiring axial displacement (thrust) monitoring, such as in centrifugal air compressors, pumps, motors, and fans. It provides a 4 to 20 mA proportional output for machinery control systems, integrating seamlessly with industry-standard control protocols.

Key Features

Integrated Proximitor Sensor: Built-in Proximitor functionality eliminates the need for an external unit.
Dynamic Output: Provides a non-isolated “PROX OUT” and “COM” terminal, as well as a coaxial connector for vibration and gap voltage diagnostics.
Adjustable Span and Zero: Non-interacting zero and span potentiometers under the transmitter label for easy loop adjustments.
Test Input Pin: Allows verification of loop output using a DC voltage source.
Power-Up Inhibit Circuit: Prevents signal errors from line voltage transients at startup.
Not OK/Signal Defeat Circuit: Ensures machinery protection by disabling high outputs or false alarms in case of faulty probes or connections.
Versatile Mounting Options: Supports both DIN-rail clips and bulkhead mounting.
Durability in Harsh Environments: Potted construction enables operation in high-humidity settings up to 100% condensing.

Technical Specifications

Parameter	Specification
Input	Compatible with 3300 NSv proximity probe
Output Signal	4 to 20 mA proportional axial displacement
Power Requirement	2-wire, loop-powered
Mounting Options	35 mm DIN-rail clips or bulkhead mounting
Approval Ratings	CSA Division 2, ATEX Zone 0, ATEX Zone 2, ABS maritime
Transmitter Weight	0.43 kg (0.9 lbm)

Environmental Limits

Operating Temperature: -35°C to +85°C (-31°F to +185°F)
Storage Temperature: -51°C to +100°C (-60°F to +212°F)

Mechanical Specifications

Transducer Tip Material: Polyphenylene sulfide (PPS)
Transducer Case Material: AISI 303 or 304 Stainless Steel (SST)

Ordering Information Breakdown

Model: 991-06-70-01-05
- A: Full-Scale Range: 0.6 mm (±0.3 mm)
- B: System Length: 7.0 meters (23.0 feet)
- C: Mounting Option: 35 mm DIN-rail clips
- D: Agency Approval: CSA Division 2, ATEX Zone 0/2, ABS maritime approval

The Bently Nevada 991 Thrust Transmitter is an optimal choice for OEMs seeking a reliable axial displacement monitoring solution, with robust design features suitable for challenging industrial environments.