Bently Nevada 3500/77M Recip Cylinder Pressure Monitor
The Bently Nevada 3500/77M is a 4-channel monitor for reciprocating compressors. It accepts inputs from approved pressure transducers, conditions signals, and compares them against user-programmable alarms. Its primary purpose is machinery protection and providing essential operational data.
Each channel delivers eight measured variables, including Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio, Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal. The monitor supports configurable Alert and Danger setpoints for active variables.
Technical Specifications
- Brand: Bently Nevada (GE)
- Model: 3500/77M (Order Code: 3500/77M-03-00)
- Series: 3500 Series Machinery Protection System
- Module Type: Recip Cylinder Pressure Monitor with Internal Terminations
- Channels: 4 channels
- Input Signal: Accepts 1-4 channels of Bently Nevada approved positive voltage pressure transducers (psia).
- Frequency Response: 0 to 5.5 kHz on all channels.
- Pressure Accuracy: ±0.5% of full-range @ +25°C; ±1.0% over -30°C to +65°C.
- Input Impedance: 50 kΩ.
- Transducer Power: +23.0 ±0.8 Vdc, 24.5 mA current limiting per channel.
- Buffered Outputs: Coaxial connectors per channel, short-circuit protected, inverted/offset -2.265 Vdc.
- Power Consumption: 7.8 Watts at full load.
- Operating Temperature: -30°C to +65°C (-22°F to +150°F).
- Storage Temperature: -40°C to +85°C (-40°F to +185°F).
- Humidity: 95% non-condensing.
- Dimensions (Monitor): 241.3 mm x 24.4 mm x 241.8 mm.
- Weight (Monitor): 0.91 kg (2.0 lb).
- I/O Module Dimensions: 241.3 mm x 24.4 mm x 99.1 mm.
- Rack Space: 1 full-height front slot + 1 full-height rear slot.
- Compliance: FCC Part 15, EMC (EN 61000-6-2, EN 61000-6-4), Electrical Safety (EN 61010-1), RoHS.
Key Features & Measured Variables
- Machinery Protection: Continuously compares parameters against configured alarm setpoints.
- Operational Data: Provides critical pressure and rod load information.
- Single Chamber Values: Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio.
- Computed Values: Peak Rod Compression, Peak Rod Tension, Degree of Rod Reversal.
- Alert & Danger Setpoints: Configurable for all active measured variables.
- LED Indicators: OK, TX/RX, and Bypass for module status.
Application & Diagnostics
- Typical Applications: Reciprocating compressors in oil & gas, petrochemical, and power generation.
- Diagnostic Capability: Monitors cylinder pressure and rod load to detect valve failure, ring wear, and pulsation issues.
- Compatibility: Integrates with Bently Nevada 3500 rack systems. Supports internal/external termination.
Installation, Maintenance & Compatibility
- Installation: Plug-in module with rear I/O. Requires 1 full-height front and rear slot.
- Maintenance: Front panel coaxial outputs for easy signal verification. LED status indicators simplify troubleshooting.
- Compatibility: Works with Bently Nevada approved pressure transducers. Interfaces with 3500 rack communication.
Packaging, Shipping & Warranty
- Package Includes: 3500/77M Monitor Module, I/O Module, documentation.
- Warranty: 12-month warranty against defects.
- Shipping: FedEx, UPS, DHL.
Frequently Asked Questions (FAQ)
- Q: What is the frequency response? A: 0 to 5.5 kHz.
- Q: How many channels does it support? A: It supports up to 4 channels.
- Q: What measured variables does it provide? A: Discharge Pressure, Suction Pressure, Max/Min Pressure, Compression Ratio, Peak Rod Compression/Tension, and Degree of Rod Reversal.
- Q: What is the operating temperature range? A: -30°C to +65°C.
Why Buy From Oiltech Controls?
- Over 15 years of experience in industrial automation spares.
- Global shipping support with reliable carriers (FedEx, UPS, DHL).
- Tested industrial surplus and refurbished options available.
- 12-month warranty for peace of mind.
- Technical verification performed before shipment.
- Specialized support for obsolete control systems, including Modicon Quantum.
Contact Information: For inquiries, email us at info@oiltechcontrols.com or call +86 158 8020 0923.
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