Bently Nevada 3500/77M Recip Cylinder Pressure Monitor – 4-Channel Machinery Protection Module

Product Overview

The Bently Nevada 3500/77M Recip Cylinder Pressure Monitor safeguards reciprocating compressors with precise pressure monitoring. This 4-channel module processes inputs from approved transducers to deliver critical performance metrics. It ensures machinery protection by triggering alarms when parameters exceed user-defined limits. Operators gain real-time insights into discharge pressure, suction pressure, and rod load conditions. The monitor supports proactive maintenance and reduces unplanned downtime.

Technical Specifications

• Inputs
  Accepts 1–4 channels from Bently Nevada-approved pressure transducers (0.5–10V range)
  Scalable mV/psi ranges: 950 mV/psi (10,000 psia) to 95,000 mV/psi (100 psia)
• Performance
  Measures 8 variables: max/min pressure, compression ratio, rod load, and reversal
  ±0.5% accuracy at 25°C (±1.0% from -30°C to +65°C)
  0–5.5 kHz frequency response for dynamic pressure analysis
• Outputs & Power
  Buffered transducer outputs (550 Ω impedance, short-circuit protected)
  +23Vdc power supply per channel (24.5 mA current limit)
  Front-panel LEDs for status, communication, and bypass mode
• Environmental
  Operates in -30°C to +65°C (-22°F to +150°F)
  95% humidity (non-condensing)
• Certifications
  Complies with FCC, EMC (EN 61000-6-2/4), LV Directive (EN 61010-1), and RoHS
  DNV GL and ABS maritime approvals
• Ordering
  176449-07: Main monitor module
  143729-01 / 143737-01: I/O modules (internal/external terminations)
  165855-XX: Custom pressure transducers

Ideal for oil & gas, petrochemical, and industrial applications requiring reliable compressor protection.