Component Description
The part number 3500/65M 145988-02 refers to a specific module from the Bently Nevada 3500 System, a premier machinery protection and monitoring platform.
3500/65M: This designates a Dual-Channel DC Voltage Monitor Module. This module is designed to monitor process parameters by accepting standard DC voltage signals, most commonly the 1 to 5 VDC or 4 to 20 mA analog signals used throughout industrial control systems. It converts these signals into engineering units (e.g., PSI, kPa, %) for display, alarm, and protection functions.
145988-02: This is a specific hardware revision or assembly number for this module.
In summary, the 3500/65M module is a versatile interface that extends the capabilities of the 3500 system beyond traditional vibration and temperature monitoring. It allows the system to incorporate a wide array of process-related signals, providing a unified platform for comprehensive machinery and process protection.
Key Parameters
The following table outlines the key parameters for the 3500/65M DC Voltage Monitor module.
| Parameter | Specification |
|---|---|
| System | Bently Nevada 3500 |
| Primary Function | Process Parameter Monitoring via DC Voltage/Current Signals |
| Channels | Two independent monitoring channels. |
| Input Type | Accepts DC voltage signals (e.g., 1 to 5 VDC) or current signals (e.g., 4 to 20 mA) with a shunt resistor. |
| Measurement Range | Programmable for a wide range of DC inputs. |
| Alarm Functions | Per channel: Two programmable alarm setpoints (usually Alert and Danger) with adjustable time delays. Can be configured for high or low alarms. |
| Sensor Power | Can provide a loop power supply for 2-wire 4-20 mA transmitters (dependent on configuration). |
| Mounting | Slides into a dedicated slot in a 3500 rack. |
| Dimensions (H x W x D) | Approx. 193 mm x 55 mm x 200 mm (7.6 in x 2.16 in x 7.87 in) |
| Weight | Approx. 0.6 kg (1.3 lbs) |
Application Scenarios
The 3500/65M is used to integrate critical process measurements into the machinery protection system, enabling coordinated shutdowns and alarms based on process conditions.
Process Pressure Monitoring:
Application: Lube Oil Pressure, Seal Oil Differential Pressure, Filter Differential Pressure.
Function: Accepts a 4-20 mA signal from a pressure transmitter. The module can trigger an alarm for low lube oil pressure or high filter delta-P, and initiate a machine shutdown to prevent damage, integrating process safety with machinery protection.
Level and Flow Monitoring:
Application: Reservoir Level, Cooling Water Flow.
Function: Monitors signals from level transmitters or flow meters. A low reservoir level or loss of cooling flow can be configured as a critical danger alarm, tripping the machine through the 3500 system's relay modules.
Load and Power Monitoring:
Application: Turbines and Compressors.
Function: Can accept a signal proportional to compressor load or turbine megawatt output. This allows for alarm generation if the machine operates outside its safe load envelope, providing protection against surge or other load-related failures.
General Purpose Analog Signal Interface:
Application: Any critical analog signal from the plant's Distributed Control System (DCS) or PLC.
Function: Serves as a bridge to bring any vital process variable into the high-integrity 3500 protection system, ensuring a safe and coordinated shutdown sequence based on a combination of mechanical and process faults.
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