Description

The Bently Nevada 3300/25 Dual Accelerometer Monitor is a rack-mounted module within the 3300 Series monitoring system. It is engineered to provide continuous, high-reliability measurement of casing vibration acceleration using two independent accelerometer inputs. This specific configuration (3300/25-03-06-06-01-00-02-00) is optimized for critical turbomachinery applications, including compressors and pumps, where high-frequency vibration detection is essential for predictive maintenance and machinery protection.

Features

• Dual independent accelerometer input channels for comprehensive casing vibration monitoring.
• Proportional 4-20 mA outputs for integration with external control systems or data acquisition units.
• Integrated relay outputs for Alert and Danger alarm conditions, facilitating automated machine shutdown or operator notification.
• Front-panel LED indicators providing real-time status for OK, Bypass, Alert, and Danger states.
• Extended full-scale range configuration for high-frequency vibration sensitivity.
• Standard input barrier configuration for signal integrity.

Applications

The 3300/25 monitor is specifically designed for use in industrial environments requiring precise casing vibration analysis. Typical applications include:

• Centrifugal and reciprocating compressors.
• Industrial pumps and fans.
• Steam and gas turbines.
• Gearboxes and high-speed rotating equipment.

Technical Specifications

Installation Guidelines

• Ensure the 3300 series rack is properly grounded to a clean instrument earth to prevent ground loops and EMI interference.
• The module should be inserted into the rack only after ensuring the power supply is stable and within specified limits.
• Use shielded twisted-pair cabling for all transducer inputs to maintain signal integrity in high-noise industrial environments.
• Maintain adequate ventilation around the rack to ensure operating temperatures remain within the specified -30 degC to +65 degC range.
• Always perform system configuration and setpoint adjustments according to the specific machinery requirements and Bently Nevada technical documentation.
• Handle with care to prevent ESD damage to internal components; use appropriate grounding straps during installation or maintenance.

FAQ

What is the primary function of the 3300/25 monitor?

The 3300/25 is a dual-channel monitor designed to process signals from accelerometers to measure casing vibration, providing alarm and shutdown capabilities for rotating machinery.

Can this module be used for high-frequency monitoring?

Yes, this specific order code includes an extended full-scale range option, making it suitable for applications where high-frequency vibration detection is necessary.

What do the LED indicators on the front panel signify?

The LEDs provide immediate visual feedback on the health of the transducer (OK), the alarm status (Alert/Danger), and whether the channel is currently in a maintenance or test mode (Bypass).