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This module receives input signals from proximity probes or magnetic pickups, converts them into digital Keyphasor signals, and accurately indicates the alignment time between the Keyphasor mark on the shaft and the sensor.

The 3500 system can accept up to 4 Keyphasor signals (normal configuration) or 8 (paired configuration), and this module is backward compatible with existing Keyphasor modules, supporting multiple event/conversion signal generation and on-site firmware upgrades.

Mainly used for mechanical protection and condition monitoring of rotating equipment such as steam turbines, compressors, pumps, and generators, helping to identify faults such as imbalance, misalignment, and shaft cracks.

Manufacturer Bently Nevada

Product Code125792-01

Model 3500/25

Type Enhanced Keyphasor Module (half height 2-channel)

Bently Nevada 3500 Monitoring System

Input signal proximity probes, magnetic pickups

Output Digital Keyphasor signals

Power consumption 3.2 Watts typical

Dimensions 119.9 x 24.4 x 256.5 mm

Weight 0.34 kg

Working temperature -40 ° C to+85 ° C

Application of Rotating Machinery Protection

Q1: What are the main functions of 3500/25 125792-01?

Provide Keyphasor signals for precise measurement of speed and 1X vibration phase, supporting mechanical fault diagnosis.

Q2: What types of input signals can this module receive?

Receive signals from proximity probes and magnetic pickups.

Q3: How many Keyphasor signals can the 3500 system support at most?

Normal configuration supports 4, paired configuration supports 8 Keyphasor signals.

Q4: Is this module backward compatible?

Fully backward compatible with existing Keyphasor modules, with identical form, adaptation, and functionality.

Simply from the perspective of the optical module itself,

Ethernet optical module is a continuous transmission, continuous reception, point-to-point optical module

PON optical module, ONU burst transmission, OLT burst reception, point to multipoint optical module

Ethernet optical module, point-to-point, is the most commonly used communication that we can understand. You send it to me, I send it to you, one-on-one

For access networks, the cost pressure will be relatively high. Therefore, we propose a concept called passive optical network, which is one to many communication, so that the shared cost of the user end can be reduced.

The benefit of one to many is the overall design of the system, but the cost is that the design of the optical module increases the difficulty

Firstly, one to many, the one with more is the user side, which is the ONU. It can only send signals at specific times, which is a burst transmission. For modules, the design is difficult

Secondly, for one to many, the received signals are from many users, which makes the design difficulty even greater for the OLT module.

Furthermore, the P in PON means passive, and this passive node has significant power loss. In the system where Ethernet optical modules are applied, there is no P in PON, it is ON, optical network, optical network. The system's loss only considers the fiber itself.

The passive ON of PON generates power loss, which requires optical modules to make up for it. Therefore, the transmission power of PON optical modules is high, but the reception sensitivity is low.

In addition, as PON optical modules evolve from the first generation to the second generation, the system needs to be compatible and smoothly evolve downwards. OLT optical modules need to have both the first and second generation functions, that is, 10G EPON OLT modules need to be compatible with EPON, and 10G GPONOLT modules need to be compatible with GPON. These are also the differences between PON modules and Ethernet modules.

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