Bently Nevada 991-01-XX-01-00 MOD 284318-01 thrust transmitter, industrial monitoring unit for axial position and machinery protection
Bently Nevada 991-01-XX-01-00 MOD 284318-01 thrust transmitter, showing terminal connection area and rugged enclosure details
Bently Nevada 991-01-XX-01-00 MOD 284318-01 thrust transmitter, compact industrial hardware with label and casing structure
Bently Nevada 991-01-XX-01-00 MOD 284318-01 thrust transmitter, industrial monitoring unit for axial position and machinery protection
Bently Nevada 991-01-XX-01-00 MOD 284318-01 thrust transmitter, showing terminal connection area and rugged enclosure details
Bently Nevada 991-01-XX-01-00 MOD 284318-01 thrust transmitter, compact industrial hardware with label and casing structure
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991-01-XX-01-00 MOD: 284318-01

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The 991-01-XX-01-00 MOD: 284318-01 is a 991 Thrust Transmitter designed for OEM applications such as centrifugal air compressors, pumps, motors, and fans.
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Technical specifications for 991-01-XX-01-00 MOD: 284318-01

  • Manufacturer:
    Bently Nevada
  • Part Number:
    991-01-XX-01-00 MOD: 284318-01
  • Product Family:
    991 Thrust Transmitter
  • Product Type:
    991 Thrust Transmitter
  • Mounting:
    35 mm DIN rail clips
  • Power Supply:
    Two-wire, loop-powered
  • Output Signal:
    Proportional 4-20 mA (axial displacement)
  • Input Source:
    3300 NSv proximity probe with extension cable (5 m or 7 m options)
  • Diagnostic Output:
    PROX OUT coaxial connector (non-isolated dynamic transducer signal)
  • Agency Approval:
    Not required
  • Key Benefit:
    Model 991-01-XX-01-00 MOD: 284318-01 offers a practical alternative to full monitoring systems where basic trending and alarming are sufficient.
  • Weight:
    0.44 kg
  • Estimated shipping dimensions:
    10x7.3x5.8cm
  • Tariff Code:
    9031809090
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Performance Application Scenarios

Features:

  • Two-wire, loop-powered design with 4-20 mA output proportional to shaft axial position for simple integration into OEM control systems.
  • 35 mm DIN rail mounting enables quick, tool-free installation in control panels without special hardware or drilling.
  • PROX OUT coaxial connector provides access to a non-isolated dynamic transducer signal for troubleshooting and diagnostics using test equipment.
The 991-01-XX-01-00 MOD: 284318-01 is purpose-built for OEMs who need to provide axial position monitoring without the complexity of a full continuous monitoring system. Its two-wire, loop-powered design simplifies wiring, requiring only a 4-20 mA loop connection to the control system for both power and signal.

The 991-01-XX-01-00 MOD: 284318-01 mounts on standard 35 mm DIN rail clips, enabling rapid installation without screws or specialized tools. This is particularly advantageous for OEMs building control panels in high volumes, where installation time directly affects production efficiency.

Despite its simplified design, the 991-01-XX-01-00 MOD: 284318-01 includes a PROX OUT coaxial connector that provides access to the non-isolated dynamic transducer signal. This feature allows technicians to connect battery-powered or isolated test equipment directly to the transmitter for troubleshooting, enabling verification of probe gap, cable integrity, and transducer response without interrupting the 4-20 mA loop to the control system.

The 991-01-XX-01-00 MOD: 284318-01 Bently Nevada 991 Thrust Transmitter may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

Bently Nevada 991-01-XX-01-00 MOD:284318-01 991 Thrust Transmitter Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Bently Nevada 991-01-XX-01-00 MOD:284318-01 991 Thrust Transmitter Specs

General

  • Manufacturer GE / Bently Nevada
  • Model 991-01-XX-01-00 MOD:284318-01
  • Condition New Original ready stock
  • Product Family 991-01-XX-01-00,991-04-XX-01-00,991-02-XX-01-00
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Key Rotary Machinery: Widely used in centrifugal air compressors, small pumps, motors, fans, and blowers.
  • Axial Position Monitoring: Specifically designed to monitor the axial (thrust) displacement of units equipped with fluid-film bearings to prevent destructive collisions between the rotor and stator.
  • System Integration: Directly inputs signals to PLC, DCS, or SCADA
  • High-precision conversion: Full-range accuracy
  • Prox Out interface: Provides raw dynamic signals and gap voltages, enabling troubleshooting and data analysis without disconnection.
  • Environmental adaptability: Utilizes potting technology.
  • Space-Constrained Environments: Due to its compact size and support for DIN rail or base plate mounting, it is suitable for installation in confined spaces such as gas compressors.
  • OEM Equipment Protection: As a standard feature of small units, it provides cost-effective and efficient continuous online displacement protection without the need for complex rack monitoring systems.
  • Remote Monitoring: Suitable for equipment monitoring in remote pumping stations or unattended sites.
Description
With its 4-20 mA output, the 991-01-XX-01-00 MOD: 284318-01 provides a practical solution for measuring rotor axial position in applications where a full continuous monitoring system is not justified. It supports basic alarming on thrust position and non-OK checking, making it suitable for OEM equipment where trending and simple protection are the primary requirements. 

The 991-01-XX-01-00 MOD: 284318-01 includes a PROX OUT coaxial connector that provides a non-isolated dynamic transducer signal for diagnostic purposes. This signal can be connected directly to battery-powered or isolated test equipment to troubleshoot machinery problems. 

While the 991-01-XX-01-00 MOD: 284318-01 offers a cost-effective approach to thrust monitoring, it has limitations compared to continuous monitoring systems. It does not support plant-wide diagnostic systems such as System 1 or Rule Paks, and its 4-20 mA signal cannot be used for advanced functions like gap alarms or phase analysis. 
Alternative Names
991-01-XX-01-05 991-04-XX-01-00 990-04-50-03-00 990-05-70-03-00
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What types of OEM equipment is the 991-01-XX-01-00 MOD: 284318-01 best suited for?
It is designed for centrifugal air compressors, pumps, motors, and fans where a simple 4-20 mA axial position signal is needed for control system integration without full diagnostic capability.
What probes are compatible with this transmitter?
The transmitter accepts input from 3300 NSv proximity probes with matching extension cables available in 5 m and 7 m system length options.
How can I use the PROX OUT signal for diagnostics?
The PROX OUT connector provides a non-isolated dynamic transducer signal. For AC-powered test equipment, the 990/991 Test Adapter is strongly recommended to condition, invert, and isolate the signal.
What monitoring functions are not available with this transmitter?
Advanced functions such as Timed OK channel defeat, Danger Bypass, Trip Multiply, and integration with plant-wide diagnostic systems like System 1 or Rule Paks are not supported.