Engineered for Accurate Axial Position Monitoring
The Bently Nevada 991-06-70-01-CN Thrust Transmitter is a high-performance, two-wire, loop-powered transmitter designed for continuous shaft axial displacement (thrust position) monitoring on critical rotating machinery. It converts signals from a compatible 3300 NSv proximity probe system into a linear 4–20 mA output, allowing direct integration with PLC, DCS, SCADA, and other industrial control platforms. The 991 series is specifically intended for OEM centrifugal compressors, pumps, motors, and fans where dependable axial position monitoring is essential for machinery protection and predictive maintenance.
The integrated Proximitor® electronics eliminate the need for a separate signal conditioner, reducing wiring complexity while maintaining excellent measurement stability. The 991-06-70-01-CN configuration features a 0.6 mm (24 mil) full-scale measurement range, a 7-meter transducer system, 35 mm DIN-rail mounting, and the CN regional certification option, making it well suited for industrial installations requiring reliable thrust monitoring.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-06-70-01-CN |
| Product Type | Thrust Transmitter |
| Measurement Type | Axial Displacement (Thrust Position) |
| Full Scale Range | 0–0.6 mm (24 mils) |
| Compatible Probe | 3300 NSv Proximity Probe |
| Transducer System Length | 7.0 m (23 ft) |
| Output Signal | 4–20 mA proportional axial position |
| Power Supply | +12 to +35 VDC |
| Loop Configuration | Two-wire loop powered |
| Mounting Method | 35 mm DIN-rail clips |
| Signal Conditioning | Integrated Proximitor® electronics |
| Diagnostic Outputs | PROX OUT and COM terminals |
| Accuracy | ±1.5% of full scale |
| Maximum Loop Resistance | 1000 Ω at 35 VDC |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -52°C to +177°C |
| Construction | Rugged industrial potted enclosure |
| Dimensions | Approx. 100 × 74 × 53 mm |
| Weight | Approx. 0.43 kg |
Where It Is Commonly Used
The 991-06-70-01-CN is designed for continuous axial position measurement on machinery equipped with thrust bearings.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Petrochemical | Compressors and expanders |
| Power Generation | Steam turbines and auxiliary equipment |
| Chemical Processing | High-speed rotating machinery |
| Manufacturing | Industrial motors, blowers and fans |
| OEM Equipment | Compressor and pump packages |
Typical applications include:
-
Shaft thrust position monitoring
-
Axial displacement measurement
-
Thrust bearing protection
-
Predictive maintenance programs
-
Machinery condition monitoring
-
PLC and DCS integration
Product Advantages
Purpose-Built for Thrust Measurement
Unlike standard vibration transmitters, the 991 series is specifically engineered to monitor axial shaft movement, helping operators detect excessive thrust bearing wear and abnormal shaft travel before equipment damage occurs.
Integrated Signal Conditioning
Built-in Proximitor® electronics simplify installation by eliminating external signal conditioning modules while maintaining accurate and stable measurements.
Flexible 7-Meter Transducer System
The 70 configuration provides a 7-meter system length, allowing greater installation flexibility between the machine and the control cabinet.
Simple DIN-Rail Installation
The 01 mounting option uses standard 35 mm DIN-rail clips, enabling quick installation in OEM control panels and industrial cabinets.
Standard 4–20 mA Output
A linear 4–20 mA output makes integration straightforward with existing PLC, DCS, and SCADA systems, simplifying machine protection and process monitoring.
Reliable Industrial Design
The rugged, potted enclosure is designed to withstand harsh industrial environments while providing dependable long-term performance in rotating equipment applications.
Technical FAQs
1. What does the 991-06-70-01-CN monitor?
It continuously measures shaft axial displacement (thrust position) and converts the measurement into a proportional 4–20 mA output.
2. Which probe system is compatible?
It is designed for use with the Bently Nevada 3300 NSv proximity probe and matching extension cable.
3. What does the "06" option represent?
It specifies a 0.6 mm (24 mil) full-scale axial displacement measurement range.
4. What does the "70" option indicate?
It identifies a 7-meter (23 ft) transducer system length.
5. What does the "01" mounting option mean?
It designates 35 mm DIN-rail mounting.
6. What is the purpose of the "CN" suffix?
The CN suffix identifies a specific regional ordering or certification configuration supplied by the manufacturer for designated markets. Configuration details should be confirmed against the official ordering guide.
7. What output signal does this transmitter provide?
It provides a 4–20 mA proportional axial displacement output.
8. Does it require an external Proximitor?
No. The transmitter includes integrated Proximitor® electronics.
9. What supply voltage is required?
The transmitter operates from a 12–35 VDC loop-powered supply.
10. Which machinery typically uses this transmitter?
It is commonly installed on centrifugal compressors, steam turbines, pumps, motors, and other rotating machines requiring continuous thrust position monitoring.
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