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3500/72M 149734-08

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The 3500/72M 149734-08 is a four-channel, API 618-compliant monitor from Bently Nevada designed specifically for reciprocating compressors.
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Technical specifications for 3500/72M 149734-08

  • Manufacturer:
    Bently Nevada
  • Part Number:
    3500/72M 149734-08
  • Product Family:
    3500 System
  • Product Type:
    Four-Channel API 618-Compliant Monitor
  • Input Impedance:
    10 kΩ
  • Power Consumption:
    7.7 watts (nominal)
  • Peak-Peak Filter:
    Fixed 1 Hz to 600 Hz
  • Gap Filter:
    -3 dB at 0.09 Hz
  • Accuracy (Typical):
    Within ±0.33% of full-scale (for most measured values)
  • Alarm Setpoint Accuracy:
    Within 0.13% of desired value
  • Alarm Delays (Alert):
    1 to 60 seconds (1-second intervals)
  • Operating Temperature:
    -30°C to +65°C (with Internal/External Termination I/O)
  • Storage Temperature:
    -40°C to +85°C
  • Weight:
    0.4 kg
  • 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 Operating Environment Performance & Efficiency

Features:

  • Multi-Mode Reciprocating Measurement
  • Flexible Channel Pairing
  • High-Precision Alarm Logic
The 3500/72M 149734-08 directly supports three critical measurement modes for reciprocating machinery: Rod Position, Rod Drop, and Hyper-Compressor, all within a single monitor.

Channels are programmed in pairs (1&2 and 3&4), allowing the monitor to perform two different functions (e.g., Rod Position on pair one and Rod Drop on pair two) simultaneously, maximizing module utility.

Alarm setpoints are adjustable from 0 to 100% of full-scale with an exceptional accuracy of within 0.13% of the desired value, ensuring reliable and repeatable protection thresholds.

The 3500/72M 149734-08 Bently Nevada four-channel, API 618-compliant monitor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 3500/72M 149734-08 four-channel, API 618-compliant 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.
Bently Nevada 3500/72M 149734-08 four-channel, API 618-compliant monitor

General

  • Manufacturer GE / Bently Nevada
  • Model 3500/72M 149734-08
  • Condition New Original ready stock
  • Product Family 176449-08,140482-01,135489-01
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.
  • Reciprocating Compressors: Primary application is monitoring rod position and rod drop in gas and air reciprocating compressors per API 618.
  • Hyper-Compressor Service: Dedicated measurement mode for ultra-high pressure ethylene and other hyper-compressor applications.
  • Machinery Protection Systems: As part of a 3500 series rack, it provides continuous protection and alarm/ trip functionality for critical assets.
  • Condition Monitoring: Used to track rider band wear and piston rod health over time through trended static position measurements.
  • Temperature Range: Operating temperature of -30°C to +65°C when used with Internal/External Termination I/O modules; 0°C to +65°C with Internal Barrier I/O.
  • Storage Limits: Safe storage from -40°C to +85°C.
  • Humidity Tolerance: Rated for 95% non-condensing humidity.
  • Rack Mounting: Standard 3500 rack mounting; occupies 1 full-height front slot and requires a separate rear I/O module slot.
  • High Measurement Accuracy: Provides typical measurement accuracy of within ±0.33% of full-scale for position magnitude, gap, and peak-peak amplitude.
  • Low Power Draw: Consumes only 7.7 watts (nominal) , placing minimal load on the 3500 rack power supply.
  • Rapid Trip Response: Danger alarms can be set for a nominal delay of just 0.1 seconds, enabling fast machine protection.
  • Signal Fidelity: Front-panel buffered transducer outputs (coaxial connectors) provide direct access to raw probe signals for portable data collectors or diagnostic tools.
Description
The 3500/72M 149734-08 is a dedicated monitor within the 3500 series machinery protection system, engineered exclusively for reciprocating compressor applications. Unlike standard vibration monitors, this module accepts input from proximity transducers and conditions the signal to generate various measured values, including rod position, rod drop, and hyper-compressor parameters. It meets the stringent requirements of API 618 for reciprocating compressors, ensuring reliable operation in critical gas and process applications.

Configuration of the 3500/72M 149734-08 is performed using the 3500 Rack Configuration Software (version 3.20 or higher required, with version 6.0+ needed for advanced "Single 2" and "Pair 2" channel types). Each of the four channels can be programmed in pairs, allowing a single module to perform up to two different functions simultaneously. For example, channels 1 and 2 can monitor rod position while channels 3 and 4 monitor rod drop. The module features front panel LEDs (OK, TX/RX, Bypass) for immediate status indication and coaxial connectors for buffered transducer outputs.

Electrically, the 3500/72M 149734-08 presents a 10 kΩ input impedance to connected proximity probes and consumes 7.7 watts nominally. Its signal conditioning chain includes a peak-peak filter fixed at 1 to 600 Hz and a gap filter with a -3 dB point at 0.09 Hz. The module supports nominal scale factors of 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil) for most modes, with an additional 0.79 mV/µm (20 mV/mil) option for standard Rod Position mode.

Alternative Names
3500/72M 176449-08 3500/72M 140471-01 3500/72M 140482-01 3500/72M 135489-01 3500/72M 146479-01
Technical notes
Bently Nevada 3500/72M 149734-08 is the complete main monitor module that requires a compatible I/O module (e.g., 140471-01, 140482-01, or 135489-01), which occupies a separate rear slot in the 3500 rack. The Bently Nevada 3500/72M 149734-08 itself occupies one full-height front slot, and users must ensure the 3500 Rack Configuration Software version is 3.20 or newer to recognize this module.
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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 specific machinery is the 3500/72M 149734-08 designed to protect?
It is specifically designed for reciprocating compressors. It measures critical parameters such as Rod Position (to assess rider band wear), Rod Drop, and Hyper-compressor dynamics.
What measured values can the 3500/72M 149734-08 provide?
Depending on configuration, it can provide Position Magnitude, Position Angle, Crank Angle, Peak-to-Peak Amplitude, Gap, 1X Amplitude, 2X Amplitude, Not 1X Amplitude, Average Piston Position, and Instantaneous Probe Gap.
Can the 3500/72M 149734-08 be used in hazardous areas?
Yes. When ordered with the appropriate I/O module (e.g., with internal barriers, ordering option 03), it has ATEX/IECEx certification: II 3(1) G Ex nA nC ic [ia Ga] IIC T4 Gc and cNRTIus Class I, Division 2, Groups A, B, C, D.
What is the accuracy of the alarm setpoints on the 3500/72M 149734-08?
The alarm setpoints are highly accurate, rated at within 0.13% of the desired value. Alert delays are programmable from 1 to 60 seconds, while Danger delays can be set to a nominal 0.1 seconds or 1-60 seconds.

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