Bently Nevada 176449-05 3500/64M Dynamic Pressure Monitor

Description

The 3500/64M Dynamic Pressure Monitor is a single-slot, four-channel device designed to monitor high-temperature pressure transducers. It drives alarms based on dynamic pressure measurements, providing critical machinery protection and operational insights.

This monitor accepts inputs from up to four pressure transducers, measuring bandpass dynamic pressure for each channel. Using the 3500 Rack Configuration Software, you can configure the bandpass corner frequencies and set additional notch filters. The monitor also includes a recorder output for use with control systems.

The main functions of the 3500/64M include:

• Machinery protection: Continuously compares monitored parameters against set alarm thresholds to trigger alerts.

• Machine status monitoring: Provides essential operational and maintenance information for personnel.

Each channel conditions its input signal to generate measured variables, and you can configure alert and danger setpoints for each variable.

Specifications

Inputs

• Accepts from 1 to 4 pressure transducer signals

• Input Impedance:

  • 3-wire transducer: 10 kΩ

  • 2-wire transducer: 1.5 MΩ to 3.5 MΩ (typical)

• Sensitivity: 100 mV/psi (1.45 mV/mBar)

Outputs

• Front Panel LEDs:

  • OK LED: Indicates proper operation

  • TX/RX LED: Indicates communication status with other modules

  • Bypass LED: Indicates when in Bypass Mode

• Buffered Transducer Outputs:

  • One coaxial connector per channel

  • Short-circuit protection for each connector

  • Output Impedance: 550 Ω

  • Transducer Supplies:

    • 3-wire: -24 Vdc

    • 2-wire: 3.3 mA current source @ 22 Vdc (nominal)

• Recorder Outputs:

  • Range: +4 to +20 mA, proportional to full-scale

  • Monitor unaffected by short circuits

  • Voltage Compliance (current output): 0 to +12 Vdc across load, with load resistance from 0 to 600 Ω

  • Resolution: 0.3662 µA per bit

  • Error: ±0.25% at room temperature; -0.66% to +0.70% over temperature range

  • Update rate: ~100 ms

Signal Conditioning

• Dynamic Pressure

  • Low Mode: 5 Hz to 4 KHz (extends to 5.285 KHz without LP filter)

  • High Mode: 10 Hz to 14.75 KHz

• Filter Quality:

  • Low Mode: 10-pole high-pass and low-pass filters

  • High Mode: 6-pole filters

• Cascade Mode: Allows channel 1 input to drive all four channels, enabling separate filter options for each channel.

Line Rejection Filter

• Two settings: 50 or 60 Hz

• Filter response:

  • -35 dB (1.8%) of Full Scale within ±0.5 Hz of center frequency

Measured Variables

• Dynamic Pressure (direct): The primary measurement for each channel

Physical Dimensions

• Height x Width x Depth: 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in)

• Weight: 0.82 kg (1.8 lb)

Alarms

• Setpoints: Configurable via 3500 Rack Configuration Software, adjustable from 0 to 100% of full-scale

• Accuracy of Setpoints: Within 0.13% of the desired value

• Alarm Delays: Programmable from 1 to 60 seconds for alert and danger levels

  • Alert: 1 to 60 seconds

  • Danger: 0.1 seconds or from 1 to 60 seconds in 0.1 second intervals

Ordering Information

Part Number

• 176449-05: 3500/64M Dynamic Pressure Monitor