3500/65 Dual channel vibration monitoring module

Description

BENTLY 3500/65 is a dual channel vibration monitoring module that is part of the industry-leading 3500 series mechanical protection system. As a key component of this modular platform, it is specifically designed to collect, analyze, and transmit vibration data of rotating machinery, serving as a critical link between sensors and control systems.

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Each channel can receive input from eddy current probes (for shaft vibration) or velocity sensors/accelerometers (for casing vibration), converting analog signals into digital data for processing. This module supports synchronous (Keyphasor reference) and asynchronous vibration analysis, enabling engineers to diagnose critical speed crossing or friction issues. Its output includes analog signals for human-machine interface (HMI), digital data for data acquisition and monitoring system (SCADA), and relay contacts for alarm driven operations (such as shutdown).

For system integrators, the 3500/65 has plug and play compatibility with other 3500 series modules such as temperature and speed modules, sharing a common backplane for power and communication. This simplifies rack configuration and reduces wiring complexity in multi-sensor settings. This module complies with API 670 and ISO 10816 standards, ensuring strict safety and diagnostic requirements, while firmware updates through BENTLY’s AMS Suite software can enhance its functionality over time.

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Main features and advantages:
BENTLY 3500/65 combines advanced technology with industrial durability to provide outstanding performance:
High fidelity signal processing: Using a 24 bit analog-to-digital converter (ADC) and digital filtering technology, it achieves a vibration amplitude accuracy of ± 0.5% and a frequency resolution of 0.1%, capable of capturing subtle fault features (such as 1st harmonic, 2nd harmonic, or random frequency components).
Dual channel redundancy design: Independent channels are equipped with independent power sources to ensure continuous operation in the event of a channel failure, which is crucial for high availability systems such as nuclear power or offshore applications.
Durable hardware design: capable of operating within a temperature range of -40 ° C to 85 ° C and withstanding 5 g of vibration, suitable for harsh environments. The compact 1U external dimensions are compatible with standard 3500 series racks, optimizing control room space.
Configurable alarm logic: Engineers can set multi-level alarms (such as warning, alert, danger) for amplitude and frequency content. For example, the peak of the 1st harmonic vibration at motor speed may trigger a maintenance alarm, while the peak of the 2nd harmonic vibration may indicate misalignment and require immediate attention.
Seamless data integration: Through 3500 series backplane communication, vibration trends are shared with predictive analysis tools, enabling machine learning models to predict the remaining useful life (RUL) of components.

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Technical specifications:
Model 3500/65
Brand BENTLY
Type: Dual channel vibration monitoring module
System compatibility 3500 series mechanical protection system
Sensor input 2 channels (eddy current probe, velocity sensor, accelerometer)
Measurement types: shaft vibration (peak to peak value), casing vibration (root mean square value/peak value)
Frequency range 0-10 kHz (analog), 0-20 kHz (digital)
Signal resolution 24 bits, 10 kHz sampling rate
Power supply 24 VDC (10-30 VDC range)
Working temperature -40 ° C to 85 ° C
Storage temperature -55 ° C to 125 ° C
Vibration immunity 5 g (5-2000 Hz, IEC 60068-2-6)
Certified API 670, CE, UL, CSA, IEC 61508 (with SIL 2 capability)
Dimensions 48.3 mm (height) x 177.8 mm (width) x 254 mm (depth)
Weight 0.9 kg
Output 4-20 mA analog signal, digital data through backplane, 2 alarm relays

Contact Us
Phone:+86 16626708626
WeChat/WhatsApp:+86 16626708626
Email: 3772179818@qq.com

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Application areas:
In a combined cycle power plant, even slight imbalances may cause destructive vibrations over time. 3500/65 continuously monitors shaft and casing vibration through eddy current probes or accelerometers, providing engineers with real-time data. By analyzing vibration amplitude, frequency, and phase, this module is able to identify patterns that indicate potential faults, enabling the team to schedule maintenance during planned downtime rather than passively responding to sudden failures.
In refineries, pumps and compressors operate under high loads, and the ability of this module to distinguish between normal operating vibrations and abnormal fluctuations is crucial for preventing leaks, fires, or catastrophic equipment failures.

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Related products:
BENTLY 3500/22M – Keyphasor and speed measurement mechanical protection module, used to synchronize vibration data with rotational phase.
BENTLY 3500/32- Four channel displacement module, used in conjunction with 3500/65, for monitoring shaft position and thermal expansion during vibration events.
BENTLY 3500/92- Communication gateway module that integrates vibration data with enterprise systems such as PI System and AWS IoT for remote diagnosis.
BENTLY 3500/05- Rack power supply, ensuring stable power supply for 3500 series racks, is crucial for maintaining module accuracy during voltage fluctuations.
BENTLY 3500/60M – Temperature monitoring module that correlates vibration data with bearing temperature to identify overheating caused by misalignment or wear.
BENTLY 3500/15- Relay module, expands alarm capability based on the trigger signal of 3500/65, and drives external devices such as cooling fans and sound and light alarms.

Installation and maintenance:
Preparation before installation:
Connect sensors using shielded twisted pair cables to reduce electromagnetic interference (EMI)/radio frequency interference (RFI); Keep a distance of 10 centimeters from the power cable.
Use a precision feeler gauge to calibrate the eddy current probe gap to the manufacturer’s specifications (usually 1-2 millimeters) to ensure accurate shaft vibration measurement.
Verify rack grounding (<1 ohm) and reserve adjacent slots for power and communication modules to facilitate air circulation.

maintain:
Use a reference vibration table for vibration calibration every quarter to verify the accuracy of the signal chain from the sensor to the module.
Review alarm setpoints annually according to the guidelines of mechanical original equipment manufacturers (OEMs), especially after major maintenance or changes in operating conditions.
Update firmware every six months through BENTLY AMS Suite to access new diagnostic features, such as advanced envelope analysis for bearing fault detection.
In corrosive environments, check the connector for oxidation every six months and apply dielectric grease to maintain signal integrity.

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