Bently Nevada 3500/72M Reciprocating Rod Position Monitor

• Input Impedance: 10 kΩ
• Measurement Accuracy: ±0.33% typical, ±1% maximum (excluding filters)
• Measurement Resolution: 0.0001 inches (0.00025 mm)
• Scale Factors: Rod position ranges from 0.79–7.87 mv/µm; rod drop and hyper-compressor both range from 3.94–7.87 mv/µm
• Frequency Response: Peak-peak filter fixed at 1 Hz to 600 Hz; gap filter at -3 dB at 0.09 Hz
• Alarm Setpoint Range: 0–100% of full scale
• Alarm Time Delays: Alert delays 1–60 seconds; danger delay is 0.1 seconds nominal or 1–60 seconds

Function Features

• Multi-parameter and Multi-channel Monitoring: It supports up to 4 proximity probe inputs and measures three core parameters including rod position, rod drop, and hyper-compressor displacement. Channels are programmed in pairs, enabling two functions to be executed simultaneously to meet comprehensive monitoring needs.
• Programmable Alarm Settings: Users can set personalized alert and danger alarm thresholds according to actual equipment operating conditions. When monitored parameters exceed the set values, the module triggers alarms promptly to alert operators to handle potential risks in a timely manner.
• Superior Signal Conditioning Capacity: It is equipped with multiple specialized filters such as constant Q notch filters and 1x/2x vector filters. The latter achieves 57.7 dB rejection, which can effectively filter out interference signals and ensure the accuracy and stability of measurement data.
• Diversified Output Interfaces: It is configured with one coaxial buffered transducer output per channel, with an output impedance of 510 Ω. It also supports six relay outputs and four 4 – 20 mA recorder outputs to meet various data transmission and control requirements of industrial systems.
• Seamless System Integration: It supports multiple industrial communication protocols and can be connected with upper – level control systems and professional monitoring software. It also allows configuration files to be downloaded via the built – in Ethernet connection, facilitating remote monitoring and unified management.
• Pair Programming for Channels: The unique paired programming mode of channels enables the module to perform two monitoring functions at the same time, improving the efficiency of signal processing and adapting to complex monitoring scenarios of reciprocating compressors.

Application Scenarios

• Oil and Gas Industry: It is widely installed on reciprocating compressors in onshore oilfields, offshore drilling platforms, and long-distance oil and gas pipelines. It monitors rod position changes in real time to prevent equipment damage and oil and gas leakage caused by abnormal rod movement, ensuring the smooth progress of extraction and transportation operations.
• Petrochemical Industry: It is applied to reciprocating compressors in refineries and chemical plants that handle flammable, explosive, and corrosive media. By monitoring rod drop and displacement parameters, it avoids leakage accidents caused by rod component failures, protecting production safety and the surrounding ecological environment.
• Refrigeration and Air Conditioning Industry: It is used in large – scale refrigeration and air conditioning systems that rely on reciprocating compressors. It maintains the efficient operation of the compressors by monitoring key rod parameters, reducing downtime caused by mechanical failures and improving the stability of the cooling system.
• Power Industry: It is deployed on reciprocating auxiliary equipment such as air compressors and feed pumps in thermal power and gas – fired power plants. It ensures the stable operation of these auxiliary equipment through continuous position monitoring, avoiding large – scale power outages triggered by auxiliary equipment malfunctions.
• Hyper-compressor Field: It is specifically used for displacement monitoring of hyper-compressors in high-pressure chemical synthesis processes. It accurately captures tiny displacement changes of hyper-compressors under ultra-high pressure conditions, providing reliable data support for the stable operation of high-pressure production processes.