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- Bently Nevada
- 3500/77M 143729-01
- Cylinder Pressure Monitor I/O Module
- USA
- 16 cm × 16 cm × 12 cm
- 1kg
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Product Overview: Bently Nevada 3500/77M 143729‑01
Brand: Bently Nevada
Series: 3500 Series Machinery Protection System
Module Type: Cylinder Pressure I/O Module (Recip Cylinder Pressure Monitor with Internal Terminations)
This module is a four‑channel pressure module intended for monitoring cylinder pressure in reciprocating compressors. It accepts inputs from approved pressure transducers, conditions the signals to obtain various pressure‑based measurements (discharge, suction, max, min pressure, compression ratio, etc.), compares these with user‑set alarm thresholds, and generates alerts or danger notifications as needed. It is used for machinery protection, diagnostics, preventive maintenance.
Technical Specifications
Here are known/typical parameters of the 3500/77M 143729‑01:
| Parameter | Value |
|---|---|
| Model | 3500/77M 143729‑01 |
| Channels | 4 (four independent pressure input channels) |
| Power Supply | 24 V DC |
| Number of Measured Variables per Channel | Up to 8 (for example: Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio; plus such combined variables as Peak Rod Compression, Peak Rod Tension, Degree of Rod Reversal) |
| Alarm Setpoints | Alert and Danger setpoints configurable per measured variable |
| Operating Temperature | approximately −20 °C to +70 °C |
| Weight | ~ 1.0 kg (shipping or gross / packing weight) |
| Dimensions | ~ 16 cm × 16 cm × 12 cm (packaged) |
Applications
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Reciprocating compressors in plants (e.g. natural gas compression, petrochemical, oil & gas)
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Machinery protection systems where cylinder internal pressure must be monitored closely
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Predictive maintenance: detecting leaking valves, abnormal pressure swings, mis‑firing cylinders
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Performance monitoring (efficiency, compression ratio, pressure losses)
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Alarm & shutdown protection for overpressure, underpressure, abnormal peaks
Advantages / Key Features
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Four channels allow monitoring of multiple cylinders with a single module
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Delivers multiple measured variables per channel (not just raw pressure) to enable more nuanced diagnostics
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User‑configurable alarm thresholds (Alert & Danger) per variable
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Internal terminations reduce external wiring complexity in certain installations
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Rugged design suitable for industrial environment
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Helps reduce downtime by early detection of faults
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Compatible with the Bently Nevada 3500 rack system, enabling integration with other protection/monitoring modules
Related Models (Same Series or Closely Related)
Here are 5 models from the same 3500/77M series or closely related, with comparative parameters. The Model column is in bold.
| Model | Channels / Main Function | Operating Temp Range | Dimensions & Weight | Notes / Unique Features |
|---|---|---|---|---|
| 3500/77M 176449‑07 | 4 channels, cylinder pressure monitoring | approx −20 °C to +70 °C | ~ 241.3 mm × 24.4 mm × 99.1 mm; ~ 0.20 kg | Accepts piezoelectric transducers, high accuracy; standard 3500/77M monitor |
| 3500/77M 140734‑07 | 4‑channel recips cylinder pressure monitor | approx −30 °C to +65 °C | ~ same module slot size; ~ 0.82 kg | Good for reliability under somewhat harsher conditions |
| 3500/77M 03‑00 143729‑01 | Same type as 143729‑01 (with internal terminations) | −20 °C to +70 °C | Packaged ~ 0.8 kg, package dims ~16×16×12 cm | Internal termination style; identical functions to standard 77M module |
| Other 77M variation (configured for low RPM etc.) | 4 channels, pressure monitoring | could be adapted for lower RPM machines | dims/weight similar to standard 3500/77M modules | Useful when machine speed is below standard threshold; may require firmware/hardware modifications |
| Rod‑Position / Velocity Monitors in 3500 series (related but different signal type) | also 4 channels but monitor displacement or velocity instead of pressure | similar industrial temp ranges | module slot size same; weight similar | For different monitored variable but often used in same machinery protection rack alongside pressure module |
Popular Models from Same Brand (Bently Nevada)
Here are 5 widely used/popular modules from Bently Nevada in similar contexts, with some parameters for comparison:
| Model | Function / Use | Channels / Inputs | Operating Temp Range | Dimensions & Weight | Key Notes |
|---|---|---|---|---|---|
| 3500/40M Proximitor Monitor | Shaft displacement / vibration monitoring via proximity probes | 4 inputs | approx −40 °C to +70 °C | module‑slot size; weight ≈ 0.8‑1.2 kg | Critical for rotor health, misalignment etc. |
| 3500/60 Temperature Monitor | Monitoring temperatures: RTDs / thermocouples | 6 channels | industrial temp ranges | module standard size; weight ~0.82 kg | Useful for bearing or casing temperature monitoring |
| 3500/65 16‑Channel Temperature Monitor | Many‑channel temperature inputs | 16 channels | same general industrial range | module standard rack size; weight ~0.9‑1.0 kg | For service where many temperature sensors are present |
| 3500/42M Proximitor / Seismic Monitor | Proximity / seismic / displacement / vibration sensors | 4 channels | typical industrial −40 °C to +70 °C | module size similar; weight ~1 kg | Used for vibration/seismic detection in foundations or heavy machinery |
| 3500/45 Position Monitor | Valve stem / shaft / position monitoring | 4+ inputs depending configuration | industrial environments | module standard; weight similar ~1 kg | For monitoring mechanical position / stroke / valve performance |
FAQs (10 Questions & Answers)
Here are ten likely questions you might get about this module, with clear answers. Each ends with a blank line.
Q1: What is the function of “internal terminations” in 3500/77M 143729‑01?
A1: Internal terminations mean the wiring connections (terminals) for the input from pressure transducers are inside the module or built into its rear connectors, rather than requiring separate external termination blocks. This simplifies wiring and reduces external components.
Q2: Can this module handle low machine speed (RPM)?
A2: The standard version is designed to operate at typical compressor speeds. If machine speed is slower than the standard limit, a modified version (or special change) may be needed to ensure accurate pressure waveform capture.
Q3: How many “measured variables” does each channel provide?
A3: Each channel can provide up to eight measured variable values: five related to a single cylinder/chamber (Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio) plus three that combine channel values and configured mechanical parameters (e.g. Peak Rod Compression, Peak Rod Tension, Degree of Rod Reversal).
Q4: How precise / accurate is the pressure measurement?
A4: Accuracy depends on the pressure transducer used, but with approved transducers, the module supports high precision (e.g. ±0.25 % full scale in some versions).
Q5: What happens when pressure exceeds the “danger” setpoint?
A5: When a configured variable exceeds its danger threshold, the module triggers an alarm via the 3500 system. This can be used to initiate shutdown or other protective actions to prevent damage.
Q6: Is the module compatible with any pressure transducer?
A6: It must be an approved or compatible pressure transducer. Output type, sensitivity, range, and wiring must match the module’s input requirements to ensure correct measurement and avoid signal drift or errors.
Q7: What ambient conditions affect module performance?
A7: Ambient temperature extremes, humidity (especially condensation), vibration, dust, electrical noise can all affect performance. The module is built for industrial use, but staying within the specified operating temperature and environmental conditions is important.
Q8: How is maintenance done? Does it require calibration?
A8: Yes, periodic maintenance and calibration are needed. Calibration of the pressure transducers themselves, verifying alarm setpoints, checking wiring connections, inspecting module integrity, ensuring firmware/software are up to date.
Q9: What is the expected lifespan?
A9: With proper installation, environment, and maintenance, modules often last many years (5‑10+), though components like transducers may require replacement sooner depending on wear or exposure.
Q10: Can this module be used in hazardous / potentially explosive atmospheres?
A10: Only if its variant is certified for such environments (e.g. ATEX / IECEx or other explosion‑proof / intrinsically safe classification). Standard versions may not have those certifications, so a certified variant or proper enclosure may be required.
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