The BENTLY 350025 (also referred to as 3500/25) is a high-performance Keyphasor Module designed to provide precise rotational synchronization and speed measurement for critical rotating equipment. As a core component of Bently Nevada’s 3500 Series Machinery Protection System, this module plays a pivotal role in vibration analysis, condition monitoring, and predictive maintenance by delivering accurate once-per-turn reference signals. Its advanced signal processing capabilities and rugged design make it indispensable in industries such as power generation, oil refining, and heavy manufacturing.

Label	Specification
Model Number	350025 (equivalent to 3500/25)
Brand	Bently Nevada
Type	Half-height, 2-channel Keyphasor Module with dual-channel input
Input Signal Range	+0.8 V to -21.0 V (non-isolated I/O) or +5 V to -11 V (isolated I/O)
Output Signal	Digital Keyphasor pulses (TTL-compatible), 4–20 mA analog speed output
Communication	RS-485 (Modbus RTU), Bently Nevada proprietary protocol
Power Supply	24 V DC ±10%
Operating Temp	-30°C to +65°C (non-isolated I/O)
Mounting	DIN rail (half-height slot in 3500 rack)
Weight	0.34 kg (main module)
Certifications	CE, CSA, API 670 compliant
Dimensions	119.9 mm x 24.4 mm x 256.5 mm
IP Rating	IP65 (with optional weatherproof housing)

The BENTLY 350025 excels in providing accurate rotational timing references for machinery monitoring. Its dual-channel input supports signals from proximity probes or magnetic pickups, converting them into digital Keyphasor pulses that synchronize vibration analysis and speed measurements . For example, in a steam turbine, the module detects shaft keyphasor marks to determine rotational speed and phase, enabling 1x vibration amplitude and phase tracking critical for detecting misalignment or imbalance .