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Match the complete marking
Include the complete Bently Nevada 3500/77M 176449-07 marking and any hardware revision on the item. Include the monitor/I/O pairing and cylinder/chamber wiring map.
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Request available label and connector photos. Have your maintenance team compare the offered 3500/77M 176449-07 with the installed equipment and applicable Bently Nevada documentation.
Technical specifications for 3500/77M 176449-07
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Manufacturer:Bently Nevada
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Product Category:Machinery Monitoring Systems
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Spare Part Number:3500/77M 176449-07
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Weight:0.85 kg
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Tariff Code:8537101190
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Input paths:1-4 pressure channels
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Transducer signal:Approved positive-voltage pressure
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Input impedance:50 kilohms
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Termination:Matching internal/external I/O
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Frequency response:0-5.5 kHz
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Pressure accuracy:+/-0.5% full range at+25 C
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Sensor supply:+23.0 VDC +/-0.8 V
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Per-channel current limit:24.5 mA
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Power consumption:7.8 W with sensor supplies fully loaded
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Buffered offset:Inverted;-2.265 VDC
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Measured variables:8 per channel
Information
Overview
Downloads
Applications / Compatibility
Product Precautions
- Bently Nevada 3500/77M 176449-07 turns chamber-pressure measurements and configured mechanical data into compressor protection variables and rod-load information.
Input paths: 1-4 pressure channels
Transducer signal: Approved positive-voltage pressure
Input impedance: 50 kilohms
Transducer signal: Approved positive-voltage pressure
Input impedance: 50 kilohms
The 176449-07 monitor conditions up to four approved pressure signals for reciprocating-compressor protection. It compares the configured measured variables with user-set alarms and provides channel information for operation and maintenance.
The pressure path uses each transducer calibration to relate its positive voltage to cylinder pressure. The five chamber variables are discharge, suction, maximum and minimum pressure plus compression ratio. Rod compression, rod tension and degree of rod reversal additionally require the configured mechanical parameters.
The system provides Alert setpoints for each active measured variable and Danger setpoints for two selected variables per channel. Diagnostic buffered outputs are inverted and offset by -2.265 VDC. Channel wiring, transducer calibration and mechanical configuration must agree before relying on the computed rod-load values.
The pressure path uses each transducer calibration to relate its positive voltage to cylinder pressure. The five chamber variables are discharge, suction, maximum and minimum pressure plus compression ratio. Rod compression, rod tension and degree of rod reversal additionally require the configured mechanical parameters.
The system provides Alert setpoints for each active measured variable and Danger setpoints for two selected variables per channel. Diagnostic buffered outputs are inverted and offset by -2.265 VDC. Channel wiring, transducer calibration and mechanical configuration must agree before relying on the computed rod-load values.
Controller platform reference: 3500/77M cylinder-pressure system. Retain sensor calibration and chamber assignments.
The original technical excerpt for Bently Nevada 3500/77M 176449-07 covers pressure-monitor operation, I/O characteristics and exact spare roles. The separate installation guide covers chamber mapping, calibration retention, termination recovery and alarm testing.
3500/77M 176449-07 Official Technical Excerpt
The original technical excerpt for Bently Nevada 3500/77M 176449-07 covers pressure-monitor operation, I/O characteristics and exact spare roles. PDF · 6 pages.3500/77M 176449-07 Installation & Verification Guide
Apter Power installation and verification guide covering chamber mapping, calibration retention, termination recovery and alarm testing. PDF · 5 pages.
Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
System and supply context: 3500/77M 176449-07 requires the matching monitor/I/O combination and approved pressure transducers. External termination hardware and sensors are separate unless itemized.
Application scope: Pressure and rod-load functions apply to the configured reciprocating-compressor system. Correct sensor scales and mechanical parameters are part of the measurement boundary.
Application scope: Pressure and rod-load functions apply to the configured reciprocating-compressor system. Correct sensor scales and mechanical parameters are part of the measurement boundary.
Cylinder pressure supervision
Track suction, discharge, minimum and maximum chamber pressures.Compression assessment
Use calibrated chamber measurements to establish compression ratio.Rod-load evaluation
Combine pressure channels with the correct mechanical configuration.Protection-path maintenance
Restore field mapping and prove the assigned pressure alarms after replacement.
Prepare Bently Nevada 3500/77M 176449-07 for its configured installation using these checks.
Map cylinder and chamber assignments
Record 3500/77M 176449-07 and each transducer-to-channel-to-chamber relationship. Identify the monitor and its matching internal or external termination arrangement.
Retain calibration and mechanics
Save pressure/voltage calibration points, configured ranges and the mechanical data used for rod-load calculations. Do not replace them with a generic sensor range.
Place protection in maintenance
Apply the approved compressor protection bypass and isolation procedure. Preserve the configured Alert/Danger assignments and relay-path relationship.
Restore the intended component
Use 143737-01 only for its external-termination I/O role and 176449-07 for the monitor role. Reconnect the correct field path without exchanging cylinder assignments.
Interpret buffered outputs correctly
Account for inversion and the -2.265 VDC offset when comparing diagnostic voltages. A direct raw-sensor comparison without that transformation is misleading.
Verify alarms and derived values
Test the assigned Alert and Danger functions and review rod-load calculations against the configured mechanics. Do not release on a plausible pressure display alone.
Alternative Names
3500/77M 176449 07
Bently Nevada 3500/77M 176449-07
Technical notes
Derived values: Rod-load results depend on the configured machine mechanics as well as pressure input. Verify those retained parameters before evaluating calculated force.
Alarm allocation: Test the selected Danger variables in addition to the active Alert variables. A pressure display check does not exercise every configured alarm path.
FAQ View All FAQ
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How many pressure channels are supported by 3500/77M 176449-07?The 3500/77M monitor supports one to four approved positive-voltage pressure-transducer inputs.
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Which chamber variables does 3500/77M 176449-07 calculate?Discharge, suction, maximum and minimum pressure, plus compression ratio, are the five single-chamber variables.
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How does 3500/77M 176449-07 obtain rod-load information?Peak rod compression, peak rod tension and degree of rod reversal combine channel measurements with configured mechanical parameters.
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How many Danger variables can be selected per channel on 3500/77M 176449-07?Danger setpoints can be configured for any two active measured variables; Alert setpoints are available for each active measured variable.
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What frequency response applies to pressure channels on 3500/77M 176449-07?Configured pressure channels have a 0-5.5 kHz frequency response under the specified signal-conditioning conditions.
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What pressure accuracy is specified for 3500/77M 176449-07?Accuracy is within+/-0.5% of transducer full range at+25 degrees C and within+/-1.0% over-30 to+65 degrees C, based on the stated 0.5-10 V span.
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Why is a buffered voltage from 3500/77M 176449-07 offset relative to the transducer?The cylinder-pressure buffered outputs are inverted and shifted by -2.265 VDC. This diagnostic transformation must be included when interpreting a scope reading.
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What sensor power is provided in the pressure system using 3500/77M 176449-07?The transducer supply is+23.0 VDC +/-0.8 V with 24.5 mA current limiting per channel. Match the approved sensor and corresponding I/O arrangement.
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