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Bently Nevada 3500/77M 176449-07 Recip Cylinder Pressure Monitor
Bently Nevada 3500/77M 176449-07 Recip Cylinder Pressure Monitor
Technical Specifications:
Description
The 3500/77M Recip Cylinder Pressure Monitor is a 4-channel monitor designed to accept inputs from Bently Nevada-approved pressure transducers. It conditions the signals to perform various pressure measurements for reciprocating compressors and compares these signals with user-programmable alarms. The monitor primarily provides machinery protection by continuously comparing monitored parameters against configured alarm setpoints to trigger alarms, and essential machine information for operations and maintenance personnel.
Each channel typically conditions its input signal to provide eight measured variable values related to cylinder pressure operation:
- Discharge Pressure
- Suction Pressure
- Maximum Pressure
- Minimum Pressure
- Compression Ratio
- Peak Rod Compression
- Peak Rod Tension
- Degree of Rod Reversal
Specifications
| Feature | Specification |
|---|---|
| Inputs | |
| Signal | Accepts 1 to 4 channels of Bently Nevada-approved positive voltage 3rd-party pressure transducers (psia) |
| Scale Factor Range |
95,000 mV/psi for 100 psia<br>38,000 mV/psi for 250 psia 19,000 mV/psi for 500 psia 9,500 mV/psi for 1000 psia<br>3,800 mV/psi for 2500 psia 1,900 mV/psi for 5000 psia<br>950 mV/psi for 10,000 psia |
| Signal Conditioning | |
| Frequency Response | 0 to 5.5 kHz on all configured pressure channels |
| Pressure Accuracy | Within ±0.5% of pressure transducer full-range (9.5 Volts: From +0.5 to +10.0 Volts) @ +25°C (77º F)<br>Within ±1.0% of pressure transducer full-range (9.5 Volts: From +0.5 to +10.0 Volts) over –30°C to +65°C (-22ºF to 150ºF) |
| Measured Variables | Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio, Peak Rod Compression, Peak Rod Tension, Degree of Rod Reversal |
| Input Impedance | 50 kΩ |
| Power Consumption | 7.8 Watts with transducer supplies at full load |
| Outputs | |
| Front Panel LEDs | OK LED (Indicates proper operation)<br>TX/RX LED (Indicates communication with other modules)<br>Bypass LED (Indicates Bypass Mode) |
| Buffered Transducer Outputs | One coaxial connector per channel, short-circuit protected |
| Output Impedance | 550 Ω |
| Transducer Power Supply | +23.0 ± 0.8 Vdc with 24.5 mA current limiting on each channel |
| Environmental Limits | |
| 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 |
| Physical | |
| Monitor Module Dimensions | 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) |
| Monitor Module Weight | 0.91 kg (2.0 lb.) |
| I/O Modules Dimensions | 241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in) |
| I/O Modules Weight | 0.20 kg (0.44 lb.) |
| Rack Space Requirements | 1 full-height front slot (Monitor Module), 1 full-height rear slot (I/O Modules) |
Compliance and Certifications
- FCC: Complies with part 15 of the FCC Rules.
- EMC: European Community Directive EMC Directive 2014/30/EU; Standards: EN 61000-6-2, EN 61000-6-4
- Electrical Safety: European Community Directive LV Directive 2014/35/EU; Standards: EN 61010-1
- RoHS: European Community Directive RoHS Directive 2011/65/EU
- Maritime: DNV GL rules for classification, ABS Rules for Condition of Classification
- Hazardous Area Approvals: Detailed listing available in the Approvals Quick Reference Guide (108M1756)
Ordering Information
| Part Number | Description |
|---|---|
| 176449-07 | 3500/77M Cylinder Pressure Monitor |
| 143729-01 | Cylinder Pressure I/O Module with Internal Terminations |
| 143737-01 | Cylinder Pressure I/O Module with External Terminations |
| 00580434 | Internal I/O Module connector header, Euro Style, 8 pin |
| 00580441 | Internal I/O Module connector header, Euro Style, 3 pin |
| 146973-01 | Recip Multi-Event Wheel Kit |
| 145732-01 | Recip Multi-Event Wheel |
| 146622-01 | Recip Multi-Event Wheel Stud |
| 165855-XX | Recip Cylinder Pressure Transducer |
| 283615 | MTL 7796+ External Barrier |
Graphs and Figures
- Main 3500/77M Cylinder Pressure Monitor Module (Front View)
- Status LEDs
- Buffered Transducer Outputs
- I/O Module Rear Views
- Cylinder Pressure I/O Module, Internal Termination
- Cylinder Pressure I/O Module, External Termination
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