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Recip Impulse Velocity Monitor

3500/70M 176449-09

Spare Part Number

PN3500/70M(176449-09+135489-01)

Product Information:

The 3500/70M (Part Number: 176449-09) is a 4-channel reciprocating machinery velocity/displacement monitor module designed specifically for monitoring the reciprocating components of rotating machinery.

  • One-year warranty
  • Global shipping
  • Exact-model verification
    • PRODUCT OVERVIEW

      What is this product?

      The Bently Nevada 3500/70M Reciprocating Compressor Velocity Monitor (Part No. 176449-09) is a four-channel machinery monitoring module designed specifically for Bently Nevada’s reciprocating compressor monitoring solutions. Users can configure each channel via the 3500 Rack Configuration Software to monitor pulsed acceleration, acceleration 2, reciprocating velocity, or low-frequency reciprocating velocity; channels are programmed in pairs, allowing for the simultaneous monitoring of two different functions. The 3500/70M continuously compares measured parameters against user-defined "Alert" and "Danger" thresholds to provide machinery protection and supply critical operational information to maintenance and operations personnel.

      Source boundary

      Exact-model hardware values shown here are qualified from public technical cross-references and require order-stage confirmation.
    • APPLICATIONS

      Where it may be used

      Applications describe the product family and are not an automatic compatibility or functional-safety approval.

      Gas Compression

      Used in reciprocating compressor installations to monitor crankcase and crosshead vibration and generate configurable machinery-protection alarms.

      Petrochemical Processing

      Applicable to reciprocating compressor equipment used in process facilities where vibration information is required for operational and maintenance monitoring.

      Oil Production

      Supports condition monitoring of reciprocating compressor machinery employed in oil-production systems by processing vibration-related transducer signals.

      Offshore Facilities

      Suitable for reciprocating machinery monitoring in offshore applications, with the manufacturer’s datasheet listing maritime standards and approvals for applicable system configurations.
Technical specifications for

3500/70M 176449-09

0 TECHNICAL PARAMETERS
  • Manufacturer:
    Bently Nevada
  • Product Category:
    Machinery Monitoring System
  • Spare Part Number:
    3500/70M(176449-09+135489-01)
  • Weight:
    0.91 kg
  • Signal:
    Accepts from 1 to 4 proximity probe signals
  • Input impedance:
    10 kΩ acceleration input >1 MΩ velocity input
  • Power consumption:
    7.7 watts, nominal
  • Transducer Power Supply Voltage:
    -22 Vdc minimum
  • Protection:
    Foldback current 15.4 to 24.9 mA
  • Output:
    550 Ω typical
  • Series:
    3500 Machinery Protection Systems
  • Stock Availability:
    10
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BUYER INFORMATION

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  • 01

    Factory Sealed

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  • 02

    Original Pack

    Unused product in original manufacturer packaging that was not originally factory sealed.

  • 03

    Factory New

    New and current product sourced through the manufacturer or authorized supply channel when expressly confirmed in the quotation.

Alternative Names

350070M1764490913548901 3500/70M176449-09+135489-01 3500/70M-01-00 3500/70M-02-00 3500/70M-03-00 3500/70M-04-00 3500/70M-05-00 3500/70M 176449-09

Information

Overview Manuals Filtering & Frequency Control Output & Interface Options

Features:

  • Supports multiple acceleration and velocity measurements within one 3500 monitor slot.
  • Provides measurement functions specifically configured for reciprocating compressor machinery.
  • Supports configurable alarms, filtering, static values, and recorder outputs.
The Bently Nevada 3500/70M 176449-09 is a four-channel Recip Impulse Velocity Monitor designed for machinery protection and condition monitoring of reciprocating equipment. It receives signals from compatible seismic transducers and conditions the inputs for impulse acceleration, acceleration, reciprocating velocity, and low-frequency reciprocating velocity measurements. Bently Nevada specifies a minimum transducer supply of −22 Vdc and a maximum supply current of 40 mA.

The module integrates into the Bently Nevada 3500 rack architecture and provides buffered transducer outputs, recorder outputs, configurable alarm setpoints, and signal-processing functions. Bently Nevada specifically identifies the 3500/70M for reciprocating-machine monitoring applications including crosshead vibration, frame vibration, and cylinder acceleration, using compatible transducers such as the 330425 Accelerometer and 190501 Velomitor CT.

The 3500/70M 176449-09 Bently Nevada Recip Impulse Velocity Monitor may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 3500/70M 176449-09 Recip Impulse Velocity Monitor Manuals(Datasheets), 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.
The monitor provides configurable high-pass and low-pass filtering. For Recip Velocity and Low Frequency Recip Velocity functions, Bently Nevada specifies selectable filter ranges and dedicated integration/RMS/peak processing characteristics. The 1X and 2X vector filter uses a constant-Q configuration with bandwidth of approximately ±3% of running speed and Q = 16.7.
Each channel provides a front-panel coaxial buffered transducer output with short-circuit protection. The monitor also provides +4 to +20 mA recorder outputs, with a maximum load resistance of 600 Ω and an update rate of less than 100 ms.

Technical notes

This module is a core component of the 3500 Machinery Protection System. It primarily receives dynamic signals from eddy-current proximity probes, speed sensors, or accelerometers. Utilizing an internal high-performance digital signal processor (DSP), it performs real-time calculation and monitoring of critical parameters—such as crosshead guide vibration, rod drop (used to monitor rider band wear), piston impact, and cylinder casing absolute vibration—for equipment like reciprocating compressors. It fully complies with API 618 and API 670 international standards. The specific suffix "-09" designates the hardware part number for the Main Monitor unit (excluding the rear I/O module or terminal block).

Four-Channel Reciprocating Machine Analysis

The Bently Nevada 3500/70M 176449-09 is a four-channel Recip Impulse Velocity Monitor designed to accept acceleration and velocity signals from compatible seismic transducers. Each channel can be configured for Impulse Acceleration, Acceleration 2, Recip Velocity, or Low Frequency Recip Velocity, allowing the monitor to address different reciprocating-machinery measurement requirements. The module accepts 1 to 4 proximity/seismic probe signals, with input impedance of 10 kΩ for acceleration and greater than 1 MΩ for velocity.

Dynamic Signal Processing & Protection

The monitor provides signal conditioning and programmable alarm functions for reciprocating-machine vibration measurements. Bently Nevada specifies selectable high-pass and low-pass filtering, 1X and 2X amplitude/phase measurements, static measurement values, buffered transducer outputs, and +4 to +20 mA recorder outputs. Alarm setpoints can be configured through the 3500 Rack Configuration Software, with alert and danger delays available for machinery protection.

Customs & shipping dimensions / weight

  • Packed shipping dimensions
    Confirmed after final packing
    Exact product dimensions are not stated in the reviewed model-specific source.
  • Packed shipping weight
    Confirmed after final packing
    Exact product dimensions are not stated in the reviewed model-specific source.
  • HS / customs code
    Not officially confirmed
    Verify the applicable code for the destination before shipment.
  • Country of origin
    USA
    Verify from the item nameplate or COO.
  • Ships from
    Xiamen, Fujian, China
    Dispatch location is confirmed in the written quotation.
  • Customs documents
    Confirmed for the destination
    Available document scope is stated in the written quotation.
PRODUCT & ORDER FAQS

Questions buyers ask about 3500/70M 176449-09

  • What is Bently Nevada 3500/70M 176449-09 used for?

    The 176449-09 is the Bently Nevada 3500/70M Recip Impulse Velocity Monitor. It is a four-channel monitor specifically designed for reciprocating compressor applications, where it receives signals from seismic transducers and processes them into vibration-related measurements. Depending on configuration, each channel can perform Impulse Acceleration, Acceleration 2, Recip Velocity, or Low Frequency Recip Velocity functions. The monitor continuously compares configured measurements with alarm setpoints for machinery protection.
  • Can the 176449-09 be installed in an existing 3500 rack?

    Yes. The 3500/70M is designed as a one full-height front-slot module, with its associated I/O module occupying one full-height rear slot. The manufacturer lists 140471-01 for Prox/Velom I/O with internal terminations and 140482-01 for external terminations, while barrier configurations are also available. The correct I/O arrangement must be selected according to the existing transducer and hazardous-area installation.
  • Which sensors and signals can this monitor work with?

    The 3500/70M accepts signals from one to four seismic transducers. Bently Nevada specifies an input impedance of 10 kΩ for acceleration input and greater than 1 MΩ for velocity input. The monitor can supply at least -22 Vdc to the transducer, with a maximum transducer current of 40 mA. Therefore, when replacing an existing monitor, the installed seismic transducer type and its electrical requirements should be checked against the 3500/70M configuration rather than assuming universal sensor compatibility.
  • What measurements can the four channels provide on a reciprocating compressor?

    The 3500/70M is particularly useful for crankcase and crosshead vibration monitoring on reciprocating compressors. Channels are programmed in pairs: channels 1–2 can perform one selected function while channels 3–4 perform another function or the same function. The available functions include Impulse Acceleration, Acceleration 2, Recip Velocity, and Low Frequency Recip Velocity. The monitor can also provide 1X and 2X amplitude/phase information for the applicable velocity and acceleration functions.
  • Are there any specific commissioning or software requirements for a 176449-09 replacement?

    Yes. Bently Nevada specifies 3500/01 Configuration Software Version 5.2 or later, 3500/02 Data Acquisition Software Version 2.50 or later, and 3500/03 Operator Display Software Version 1.50 or later. The 3500/70M requires firmware Version 4.21 or later. The standard product also supports machine speeds down to 60 RPM; applications down to 30 RPM require modification 135M8137-01. These points should be checked before replacing an older monitor in a slow-speed reciprocating-compressor application.
  • What should be considered when selecting the I/O and termination arrangement?

    The I/O configuration must match the intended installation. Bently Nevada specifies that external termination blocks and their cables must be ordered separately when an I/O module with external termination is used, and external termination blocks cannot be used with internal-termination I/O modules.
  • Can Moore Automated supply 176449-09 as a new replacement unit, and what warranty is included?

    Yes. Moore Automated can check inventory for the exact 176449-09 part number and provide actual product photographs and technical documentation before purchase. We supply new and original products with a one-year warranty. If a customer needs certificates, available documentation may include COO, COC, test reports, calibration certificates, and a warranty letter; when applicable, the requested documents can be packed together with the shipment.
  • Can you help with pricing and international delivery for this 3500/70M module?

    Yes. If you provide your required quantity and target price, we can efficiently check whether a discount is available and, when you are ready to purchase, request a special price where possible. Moore Automated is not an authorized Bently Nevada agent, but we supply products carrying the same branded part-number specification. For international orders, DHL or FedEx door-to-door delivery is supported. If you need the technical manual or actual photos of the 176449-09 before placing the order, we can provide them as well.
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    Moore Automated provides high-quality Bently Nevada replacement modules and spare parts for installed 3500 machinery protection systems. These supply solutions help customers maintain existing monitoring infrastructure and reduce unnecessary machinery downtime.

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Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.

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