Bently Nevada 991-25-70-03-05 thrust transmitter, compact industrial device for thrust position monitoring applications
Bently Nevada 991-25-70-03-05 thrust transmitter, showing wiring terminal area and durable enclosure details
Bently Nevada 991-25-70-03-05 thrust transmitter, machinery monitoring hardware with front label and connector details
Bently Nevada 991-25-70-03-05 thrust transmitter, compact industrial device for thrust position monitoring applications
Bently Nevada 991-25-70-03-05 thrust transmitter, showing wiring terminal area and durable enclosure details
Bently Nevada 991-25-70-03-05 thrust transmitter, machinery monitoring hardware with front label and connector details
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991-25-70-03-05

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The Model 991-25-70-03-05 is a 991 Thrust Transmitter designed for OEMs of centrifugal air compressors, pumps, motors, and fans, providing a simple 4 to 20 mA proportional axial displacement (thrust) signal for machinery control systems.
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Technical specifications for 991-25-70-03-05

  • Manufacturer:
    Bently Nevada
  • Part Number:
    991-25-70-03-05
  • Product Family:
    991 Thrust Transmitter
  • Full-scale Range:
    ±25 mils
  • System Length:
    7.0 meters (23.0 feet)
  • Mounting:
    DIN clips and screws
  • Output Signal:
    4 to 20 mA
  • Input Compatibility:
    3300 NSv proximity probe
  • Primary Application:
    Centrifugal air compressors, pumps, motors, fans
  • System Compatibility:
    Not suitable for System 1 or Rule Paks
  • Pain Point Solved:
    The 991-25-70-03-05 provides a simple 4-20 mA thrust signal directly to existing control systems, eliminating the need for specialized monitoring hardware. OEMs can offer axial position alarming without the complexity and cost of full continuous monitoring systems.
  • 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

Features:

  • 991 Thrust Transmitter with ±25 mils full-scale range for axial displacement monitoring
  • 7.0-meter system length with DIN clip and screw mounting for flexible installation
  • CSA Division 2, ATEX Zone 0/2, and ABS maritime approved for hazardous and marine applications
The 991-25-70-03-05 provides essential axial position sensing functions critical to the entire monitoring path, serving as the primary interface between NSv proximity probes and OEM control systems, directly affecting the proper, normal operation of the overall machinery protection scheme. One 991-25-70-03-05 transmitter is required per thrust measurement point, installed on DIN rail in the control cabinet and connected to the 3300 NSv probe via its 7.0 meter system length. The 991-25-70-03-05 features a ±25 mils full-scale range, providing appropriate scaling for centrifugal compressor and pump thrust monitoring applications.

For applications requiring hazardous area compliance, the 991-25-70-03-05 carries CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approvals for use in explosive atmospheres and marine environments. In addition to standard thrust monitoring, the 4-20 mA output of the 991-25-70-03-05 enables direct connection to existing PLC and DCS analog inputs without requiring specialized monitoring hardware. The two-wire loop-powered design simplifies wiring and reduces installation costs.

The 991-25-70-03-05's robust design ensures reliable operation in OEM applications. Users should note that while the 991-25-70-03-05 provides reliable thrust measurement, advanced monitor functions such as Timed OK channel defeat, Danger Bypass, and Trip Multiply cannot be used, and the transmitter is not suitable for plant-wide diagnostic systems such as System 1 or Rule Paks. The 991-25-70-03-05 remains a practical solution for OEMs requiring simple axial position alarming with global hazardous area approvals.

The 991-25-70-03-05 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 991-25-70-03-05 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 991-25-70-03-05 Thrust Transmitter Specs

General

  • Manufacturer GE / Bently Nevada
  • Model 991-25-70-03-05
  • Condition New Original ready stock
  • Product Family 991-06-70-03-05,991-25-50-03-05,991-25-70-02-05,991-25-70-03-00
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.
Description
The Model 991-25-70-03-05 is a loop-powered thrust transmitter engineered for OEMs requiring simplified axial position monitoring for centrifugal air compressors, pumps, motors, and fans. This two-wire device accepts input from 3300 NSv proximity probes with matching extension cables in a 7.0 meter system length. The 991-25-70-03-05 converts raw probe signals into a proportional 4 to 20 mA output representing shaft axial position.

The 991-25-70-03-05 conditions thrust signals into appropriate engineering units with a ±25 mils full-scale range. This industry-standard signal provides machinery protection alarming and logic capabilities within existing control platforms. The 991-25-70-03-05 simplifies integration for OEMs while offering valuable trending capabilities for rotor axial position monitoring.

Mounting flexibility is provided by DIN clips and screws on the 991-25-70-03-05, enabling quick installation in standard control cabinets. The 7.0 meter system length accommodates typical distances between sensing probes and control equipment. The 991-25-70-03-05 carries CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approvals for global deployment.

While the 991-25-70-03-05 provides reliable thrust measurement, users should note its limitations compared to continuous monitoring systems. Advanced monitor functions such as Timed OK channel defeat, Danger Bypass, and Trip Multiply cannot be used. The 991-25-70-03-05 remains a practical solution for OEM applications requiring simple axial position alarming.
Alternative Names
991-06-70-03-05 991-25-50-03-05 991-25-70-01-05 991-25-70-02-05
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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 difference between the 991-25-70-03-05 thrust transmitter and a full continuous monitoring system?
The 991-25-70-03-05 provides simplified 4-20 mA output for basic thrust alarming within OEM control systems, while continuous monitoring systems offer advanced features including Timed OK channel defeat, Danger Bypass, Trip Multiply, and integration with plant-wide diagnostic platforms like System 1. The 991-25-70-03-05 is a cost-effective solution for applications requiring only basic thrust position alarming, but lacks the sophisticated protection capabilities of full monitoring systems.
How to identify a reliable supplier for the 991-25-70-03-05?
A reliable supplier should provide documented traceability of CSA Division 2, ATEX Zone 0/2, and ABS maritime certifications. They must verify the 7.0 meter system length and ±25 mils full-scale range specifications, and demonstrate knowledge of 3300 NSv probe compatibility. Look for suppliers who can explain the limitations of thrust transmitters versus continuous monitoring systems and advise on appropriate applications. Avoid suppliers who cannot produce original certification documents or claim the 991-25-70-03-05 supports features like Danger Bypass or Trip Multiply which are explicitly not available.
What certifications are required when exporting the 991-25-70-03-05 to the United States?
The 991-25-70-03-05 carries CSA Division 2 certification which is accepted in the US through CSA/US mutual recognition, along with ATEX certifications for international acceptance. Export documentation must include country of origin, product value declaration, and HTS classification. The hazardous area approvals satisfy NEC requirements for Class I, Division 2 locations when properly installed. The ABS maritime approval satisfies US Coast Guard requirements for marine applications. Buyers should verify that the 7.0 meter system length meets their specific installation requirements.
Why do thrust monitoring components fail in OEM applications while the 991-25-70-03-05 survives?
Standard components fail from signal incompatibility with control systems, inadequate environmental protection, and complex integration requirements. The 991-25-70-03-05 survives with simple 4-20 mA output that directly interfaces with standard PLC inputs, eliminating conversion errors. The hazardous area certifications (CSA Division 2, ATEX Zone 0/2) and ABS maritime approval ensure the 991-25-70-03-05 is built to survive harsh industrial and marine environments where uncertified components fail.