The Bently Nevada 3500/25 Enhanced Keyphasor Module is a critical component within the Bently Nevada 3500 Series Machinery Protection System. It's designed to provide precise timing information about rotating machinery, which is essential for accurate vibration monitoring and diagnostics.

What the 3500/25 Does

The 3500/25 is a half-height, two-channel module that serves as the "heartbeat" of the 3500 system when it comes to rotational speed and phase information. Here's a breakdown of its core functions:

• Keyphasor Signal Generation: It receives input signals from proximity probes or magnetic pickups that are pointed at a Keyphasor mark (e.g., a notch or projection) on a rotating shaft or gear. The module then converts these analog inputs into precise digital Keyphasor signals.
• Timing Reference: This Keyphasor signal is a once-per-turn (or multiple-event-per-turn) pulse. It acts as a crucial timing reference for all other monitor modules in the 3500 rack.
• Measurement Enablement: By providing this timing information, the 3500/25 allows other monitor modules and external diagnostic equipment to accurately measure:
• Shaft Rotative Speed: The RPM of the machine.
• Vector Parameters: Critical vibration parameters like 1X vibration amplitude and phase. Phase information is vital for advanced diagnostics like balancing, alignment, and identifying specific fault types.

• Enhanced Capabilities: The "Enhanced" designation indicates improved signal processing over previous Keyphasor modules, including the ability to generate once-per-turn signals from multi-event-per-turn inputs. It also supports field-upgradeable firmware and asset management data reporting.

Why the Keyphasor Signal is So Important

Imagine trying to understand the precise movement of a spinning top without knowing when it completes a full rotation. That's essentially what the Keyphasor signal provides for rotating machinery. Without it, you couldn't:

• Measure 1X Vibration: The vibration component occurring once per revolution, which is often indicative of imbalance.
• Determine Phase: The relative timing of the vibration to a specific point on the shaft, crucial for diagnosing unbalance, misalignment, and bent shafts.
• Track Speed Changes: Monitor the exact rotational speed for overspeed protection or process control.
• Perform Advanced Diagnostics: Many sophisticated diagnostic techniques rely on a precise timing reference.

System Integration and Configuration

The 3500/25 operates within the larger Bently Nevada 3500 Machinery Protection System. Key aspects of its integration include:

• Rack Compatibility: It's a half-height module that fits into the 3500 rack alongside other monitor and power supply modules.
• Channel Capacity: Each 3500/25 module provides two channels for Keyphasor inputs. A standard 3500 system can accept up to four Keyphasor signals, and in a paired configuration, it can handle up to eight.
• Redundancy (TMR): For Triple Modular Redundant (TMR) applications, where maximum reliability is required, two Keyphasor modules can be used in parallel to provide primary and secondary Keyphasor signals to the other modules.
• I/O Module Options: Various Input/Output (I/O) module types are available for the 3500/25, including:
• Internal Terminations: Wiring connects directly within the rack.
• External Terminations: Wiring connects to a separate terminal block.
• Isolated I/O: Provides electrical isolation from other systems (like control systems) when multiple devices are connected to the Keyphasor signals, ensuring signal integrity and preventing interference. While primarily designed for magnetic pickups, isolated I/O modules can also provide isolation for proximity probe applications with an external power supply.

Typical Applications

The Bently Nevada 3500/25 Enhanced Keyphasor Module is found in virtually any industrial application involving critical rotating machinery where precise vibration and speed monitoring is essential for safety and efficiency. This includes:

• Power Generation: Steam turbines, gas turbines, generators, hydro turbines.
• Oil & Gas: Compressors (centrifugal, reciprocating), pumps, motors, expanders.
• Petrochemical: Process pumps, fans, cooling towers.
• Manufacturing: Large fans, blowers, motors, gearboxes.
• Pulp & Paper, Mining, Cement: Large rotating kilns, mills, crushers, and associated drives.

The 3500/25's ability to provide accurate and reliable speed and phase information makes it indispensable for machine protection, advanced diagnostics, and ultimately, for ensuring the longevity and safe operation of high-value rotating assets.

Do you have a specific question about the 3500/25, or would you like to explore another module in the Bently Nevada 3500 Series?

Bentley 3500/25-01-01 (149369-01,125800-01) key phase module front and rear panels

The Bentley 3500/25 key phase module is a half-height module that supplies power to the key phase sensor, adjusts the key phase signal, and then sends the key phase signal to other modules within the frame. The Bentley 3500/25 key phase module calculates the rotational speed rpm value and sends it to the DCS or PLC.

The bently nevada3500 Bentley module is used for vibration monitoring of large and medium-sized rotating machinery such as steam turbines, compressors, fans, water pumps, coal mills, gearboxes, and motors. It is widely applied in many industries including steel, power, metallurgy, chemical engineering, and petrochemicals. The bently nevada3500 module is a product of Bentley Nevada, USA, specializing in monitoring mechanical vibration and mechanical protection. The Bentley 3500/25 key phase module is a half-height module that supplies power to the key phase sensor, adjusts the key phase signal, and then sends the key phase signal to other modules within the frame. The Bentley 3500/25 key phase module calculates the rotational speed rpm value and sends it to the DCS or PLC. Spare parts front and rear plates 3500/25-01-01-00(149369-01,125800-01).

Key phase device module 3500/25-AXX-BXX-CXX selection:

A: Number of channels

0 1 1 Half-height 2-channel key phase sensor card (ordered for 2-channel)

0 2 2 half-height 2-channel key camera clips (ordered for 4-channel)

B: Input/Output (I/O) module type

0 1 I/O module with internal terminals

0 2 I/O module with external terminals

0.3 I/O modules with internal safety barriers and internal terminals

0 4 Insulated I/O module with internal terminals

0 5 Insulated I/O module with external terminals

C: Approval unit option 00 None 01 CSA/NRTL/C

bently nevada 3500/25-01-01-00(149369-01,125800-01) Bently key phase module spare parts

149369-01 Improved Keyphase Module

Note: After being ordered, this module can be directly inserted into the frame to replace the keyphase module 125792-01.

125800-01 Key phase Input/Output (I/O) Module (with Internal terminals)

126648-01 Key phase Input/Output (I/O) Module (with External terminals)

125800-02 Insulated Key phase Input/Output (I/O) Module (with Internal terminals)

126648-02 Insulated Key phase Input/Output (I/O) Module (with External terminals)

135473-01 Key Phase Input/Output (I/O) Module (with internal safety barrier and internal terminals)

04425545 Grounding WristBand (Single Purpose)

00580438 connector, internal terminal, 4 positions, green

00502133 connector, internal terminal, 12 positions, blue

129770-01 Key Phase Module Manual