Bently Nevada 991-25-70-01-00 thrust transmitter, industrial enclosure for axial displacement and machinery monitoring
Bently Nevada 991-25-70-01-00 thrust transmitter, showing terminal block and enclosure structure for field wiring
Bently Nevada 991-25-70-01-00 thrust transmitter, machine protection module with visible connector area and hardware label
Bently Nevada 991-25-70-01-00 thrust transmitter, industrial enclosure for axial displacement and machinery monitoring
Bently Nevada 991-25-70-01-00 thrust transmitter, showing terminal block and enclosure structure for field wiring
Bently Nevada 991-25-70-01-00 thrust transmitter, machine protection module with visible connector area and hardware label
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991-25-70-01-00

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The 991-25-70-01-00 is a 2-wire loop-powered thrust transmitter with ±25 mils full-scale range, 7.0 m system length, 35 mm DIN-rail mounting, and 4-20 mA output for axial position monitoring.
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Technical specifications for 991-25-70-01-00

  • Manufacturer:
    Bently Nevada
  • Part Number:
    991-25-70-01-00
  • Product Family:
    991 Thrust Transmitter
  • Product Type:
    991 Thrust Transmitter
  • Full-Scale Range:
    ±25 mils (25-0-25 mils)
  • System Length:
    7.0 meters (23.0 feet)
  • 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)
  • Agency Approval:
    Not required
  • Key Benefit:
    Solves cost-effective axial position monitoring for OEM equipment—±25 mils range captures bidirectional thrust, 4-20 mA output integrates directly into control systems without full monitoring complexity.
  • Weight:
    0.5 kg
  • Estimated shipping dimensions:
    10x7.4x6cm
  • 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 Applications Connectivity Safety and Compliance

Features:

  • ±25 mils bidirectional full-scale range captures axial thrust movement in both positive and negative directions from center.
  • Two-wire loop-powered design with 35 mm DIN rail mounting simplifies installation and reduces wiring complexity.
  • 7.0 meter system length enables remote Proximitor sensor placement without additional extension cables.
The 991-25-70-01-00 measures axial displacement in both directions, with a ±25 mils range centered at 12 mA output. When the shaft moves toward the probe, output increases toward 20 mA; when it moves away, output decreases toward 4 mA. This bipolar measurement captures thrust bearing wear and rotor position changes.

DIN rail mounting and loop-powered design make this transmitter easy to add to OEM control panels. Snap it onto the rail, connect the 4-20 mA loop, and wire the 3300 NSv probe input. No external power supply, no configuration software, no complex setup—just a proportional thrust signal.

The 7.0 meter system length lets you locate the Proximitor sensor in a control cabinet away from the machine. The transmitter accepts 3300 NSv probes with extension cables in 5 m or 7 m options, giving flexibility for machine layouts where the measurement point and electronics are separated.

The 991-25-70-01-00 Bently Nevada Thrust Transmitter may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

Bently Nevada 991-25-70-01-00 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 991-25-70-01-00 Thrust Transmitter Specs

General

  • Manufacturer GE / Bently Nevada
  • Model 991-25-70-01-00
  • Condition New Original ready stock
  • Product Family 991-06-70-01-00,991-25-50-01-00,991-25-70-02-00
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.
  • Rotating Machinery Monitoring: Widely used in centrifugal air compressors, small pumps, motors, and fans.
  • Thrust Position Measurement: Specifically monitors equipment with fluid-film thrust bearings to prevent mechanical damage caused by excessive axial displacement.
  • OEM System Integration: Suitable for applications requiring direct connection of simple 4-20 mA proportional signals to PLC or DCS control systems without the need for expensive continuous monitoring architectures (such as the 3500 system).
  • Signal Transmission: Employs an industry-standard 4-20 mA analog current loop output, with current magnitude proportional to the axial position of the axis.
  • Input Interface: Accepts input signals from the 3300 NSv proximity probe and its associated extension cable.
  • Diagnostic Output (PROX OUT): Equipped with a non-isolated coaxial connector, it outputs dynamic vibration and gap voltage signals for analysis by field diagnostic instruments.
  • Electrical Safety: Equipped with a Not OK/signal suppression circuit. When the probe is damaged or the connection is loose, the signal output drops below 3.6 mA, effectively preventing false alarms.
  • Environmental Protection: The housing is potted, allowing it to withstand humid environments with up to 100% condensation.
  • Compliance: Complies with FCC Part 15 regulations regarding electromagnetic interference and is CE marked with the European Union.
  • Power-On Protection: Built-in power-on suppression circuit prevents erroneous alarm signals caused by voltage transients during system startup.
Description
The 991-25-70-01-00 converts axial shaft displacement into a 4-20 mA signal proportional to thrust position. Its ±25 mils full-scale range captures movement in both directions from a neutral center point. The transmitter accepts input from 3300 NSv proximity probes with matching extension cables, conditioning the signal into engineering units for OEM control systems.

With a 7.0 meter system length, the 991-25-70-01-00 allows the Proximitor sensor to be located remotely from the measurement point. The 35 mm DIN-rail mounting clips enable snap-in installation without drilling holes. As a two-wire, loop-powered device, it requires only a 4-20 mA loop for both power and signal—simplifying wiring in OEM control panels.

The 991-25-70-01-00 is intended for OEMs of centrifugal air compressors, pumps, motors, and fans who need simple thrust monitoring without full diagnostic capabilities. Its ±25 mils range suits applications with moderate axial movement where basic trending and alarming are sufficient. No hazardous area approvals are required, making it suitable for general-purpose industrial environments.

This transmitter solves the pain point of adding cost-effective axial position monitoring to OEM equipment. The 991-25-70-01-00 delivers a clean 4-20 mA signal that integrates directly into existing control systems, enabling basic thrust alarming without the complexity of continuous monitoring systems.
Alternative Names
991-06-70-01-00 991-25-50-01-00 991-25-70-01-05 991-25-70-02-00
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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 is the full-scale range of the 991-25-70-01-00?
It measures ±25 mils (25-0-25 mils), capturing axial displacement in both directions from a neutral center point.
What mounting method does this transmitter use?
It snaps onto standard 35 mm DIN rail clips—no drilling or special tools required for installation.
What system length does the 991-25-70-01-00 provide?
It has a 7.0 meter system length, allowing the Proximitor sensor to be located away from the measurement point.
What OEM equipment is this transmitter designed for?
Centrifugal air compressors, pumps, motors, and fans where simple axial position monitoring and trending are sufficient.