Bently Nevada 3500/50E
Bently Nevada 3500/50E
Bently Nevada 3500/50E
Bently Nevada 3500/50E
Bently Nevada 3500/50E
Bently Nevada 3500/50E
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3500/50E

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The Bently Nevada 3500/50E is a 2-channel tachometer module for monitoring shaft speed, rotor acceleration, and direction using proximity probes or magnetic pickups.
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Technical specifications for 3500/50E

  • Manufacturer:
    Bently Nevada
  • Part Number:
    3500/50E
  • Product Family:
    3500 System
  • Inputs Signal:
    Each Tachometer Module accepts up to 2 transducer signals from proximity probe transducers or magnetic pickups.
  • Input signal range:
    +10.0 V to -24.0 V.
  • Input Impedance:
    20 k Ω (standard)
  • Power Consumption:
    4.75 watts, typical.
  • Transducers:
    Accepts 1-2 proximity transducer signals.
  • OK LED:
    Indicates when the 3500/50E is operating properly.
  • DANGER LED:
    Indicates the 3500/50E has detected a danger condition and is driving the danger relay.
  • ALERT LED:
    Indicates the 3500/50E has detected an Alert condition and is driving the alert relay.
  • Bypass LED:
    Indicates when the 3500/50E is in Bypass Mode
  • Output Impedance:
    500 Ω.
  • Voltage Compliance (current output):
    0 to +12 Vdc range across load. Load resistance is 0 to 600 Ω.
  • Signal Conditioning:
    Specified at +25 ºC (+77 ºF)
  • Operating Temperature:
    -20 ºC to +65 ºC (-4 ºF to +150 ºF)
  • Storage Temperature:
    -30 ºC to +85 ºC (-22 ºF to +185 ºF)
  • Humidity:
    95%, non-condensing.
  • Compliance and Certifications:
    EMC, EN 61010-1: 2010
  • Weight:
    1.24 kg
  • Estimated shipping dimensions:
    5.5x29x23cm
  • Tariff Code:
    8537101190
  • 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 Use Cases Monitoring & Control Certifications & Standards

Features:

  • Dual-Channel Speed Monitoring with Peak Value Retention
  • Versatile Sensor Input Compatibility and Signal Conditioning
  • Flexible Operating Modes for Diverse Rotational Applications
The 3500/50E operates as the Enhanced Tachometer Module within the 3500 monitoring system, providing precise rotational speed measurement and event detection for critical rotating machinery. It continuously processes incoming signals from eddy current probes or magnetic pickups across a wide input range (+10.0V to -24.0V), converting these to reliable speed data and distributing conditioned Keyphasor signals through the rack backplane to support synchronous operation of other monitors and protection modules. Seamless integration is standard with the 3500/50E, and utilizing the Triple Modular Redundant (TMR) configuration will allow continued operation with majority voting logic in the event of a single module failure. The 3500/50E has incorporated significant improvements over previous tachometer designs, including expanded speed range capability and enhanced peak hold functionality within the 3500 rack.

The 3500/50E provides essential speed monitoring functions critical to machinery protection, serving as a vital component of the measurement path, directly affecting the accurate detection of rotational parameters and overall system reliability. One or two 3500/50E modules are required per rack depending on the number of speed measurement points and desired redundancy level. The 3500/50E occupies a single full-height slot in the rack and can be installed in any available slot position (1-15) with the appropriate I/O module.

For TMR Redundant applications, the 3500 System requires three 3500/50E tachometer modules installed with corresponding TMR I/O modules. In addition to standard single module operation, the TMR configuration performs automatic channel comparison and voting. The 3500 TMR speed configuration executes reliability checking using the internal comparison circuitry specified in the module options. Using this method, the redundant speed system continually monitors the health of all three channels. If the system detects that one 3500/50E channel is no longer providing accurate measurements (outside configured tolerance levels compared to the other two channels), it will automatically exclude the erroneous data and utilize the remaining two channels for continued reliable operation, placing an event in the System Event List.

The 3500/50E Bently Nevada Enhanced Tachometer Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 3500/50E Enhanced Tachometer Module 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 3500/50E Enhanced Tachometer Module Specs

General

  • Manufacturer Bently Nevada
  • Model 3500/50E
  • Condition New Original ready stock
  • Product Family 3500/50,3500/50M,133388-02
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.
  • Power Generation: Monitoring the speed of steam, gas, and hydro turbines to ensure they operate within safe limits.
  • Oil & Gas: Protecting high-speed compressors and pumps in refineries and petrochemical plants.
  • Maritime & Offshore: Used in ship propulsion systems and offshore platforms where rotor direction and speed are critical.
  • Manufacturing: Monitoring large motors and conveyor systems to detect mechanical imbalances early.
  • Measurement Modes: Configurable for speed monitoring, zero-speed notification, rotor acceleration alarming, and reverse rotation notification.
  • Keyphasor Capabilities: It can condition Keyphasor signals and supply them to the 3500 rack backplane, eliminating the need for a separate Keyphasor module.
  • Alarming: Features user-programmable setpoints for "Alert" and "Danger" levels. These can drive relay logic in separate 3500 relay modules for automated protective actions.
  • Outputs: Provides 4 to 20 mA analog recorder outputs proportional to the measured speed, which are used for secondary data logging or chart recording.
  • Peak Hold: Automatically stores and retains the highest reached speed or reverse rotation count until reset by the user.
  • API 670: Fully complies with the American Petroleum Institute’s standard for machinery protection systems.
  • Hazardous Areas: Certified for use in high-risk environments through ATEX/IECEx, CSA/NRTL/C (Class 1, Division 2), and FM approvals.
  • Functional Safety: Can be used in Safety Instrumented Systems (SIS) requiring up to SIL 2 rating.
  • Maritime: Specifically approved by DNV and Class NK for maritime applications. Environmental & General: Complies with CE, RoHS, REACH, and WEEE directives.
Description
The Bently Nevada 3500/50E Tachometer Module is a precision 2-channel device designed to accept inputs from 1-2 proximity probe transducers or magnetic pickups, with an input signal range from +10.0 V to -24.0 V and a standard input impedance of 20 kΩ. The module operates efficiently with a typical power consumption of 4.75 watts and provides reliable signal conditioning at standard room temperature of +25 ºC (+77 ºF).

Equipped with multiple LED indicators, the 3500/50E ensures clear status monitoring: the OK LED confirms proper operation, the DANGER LED signals a dangerous condition and activates the danger relay, the ALERT LED indicates alert conditions and triggers the alert relay, and the BYPASS LED shows when the module is in bypass mode. Output impedance is 500 Ω, with voltage compliance from 0 to +12 Vdc across a load resistance of 0 to 600 Ω.

Designed for rugged industrial environments, the 3500/50E operates in temperatures from -20 ºC to +65 ºC (-4 ºF to +150 ºF) and can be stored in -30 ºC to +85 ºC (-22 ºF to +185 ºF), with 95% non-condensing humidity tolerance. It is compliant with EMC standards and EN 61010-1:2010.

Programmed via 3500 Rack Configuration Software, the 3500/50E supports four configurable monitoring modes: speed monitoring with setpoint and speed band alarming, zero speed notification, rotor acceleration alarming, or reverse rotation notification. A peak hold feature records the highest speed, highest reverse speed, or total number of reverse rotations, which can be reset by the user for precise operational tracking.
Alternative Names
35OO/5OE 3500-50E 350050E 3500 50E 35OO5OE
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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 3500/50E operating temperature range?
-20 ºC to +65 ºC (-4 ºF to +150 ºF).
Can I get a discount if I order multiple units?
Prices for bulk orders may be adjusted; please contact Apter Power sales.
What is the 3500/50E module’s power consumption?
Typical power consumption is 4.75 watts.
Does 3500/50E have status indicators?
Yes, it has OK, DANGER, ALERT, and BYPASS LEDs to indicate operational conditions.

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