3500/70M 176449-09+135489-03 Recip Impulse Velocity Monitor , China 3500/70M 176449-09+135489-03 Recip Impulse Velocity Monitor Manufacturers, Suppliers, Factory

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	3500/70M 176449-09+135489-03
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Specifications

Product Name	3500/70M 176449-09 + 135489-03
Type	Recip Impulse Velocity Monitor
Dimensions	2.5x25.6x24 cm
Weight	0.82 kg
Input Signal	Accepts 1 to 4 proximity probe signals
Input Impedance (Acceleration)	10 kΩ
Input Impedance (Velocity)	>1 MΩ
Special Inhibit	Contact closure, 5 VDC @ 390 µA typical
Power Consumption	7.7 W (nominal)
Input Sensitivity (Impulse Acceleration)	0.51–11.72 mV/(m/s²); 5–115 mV/g
Input Sensitivity (Acceleration 2)	0.51–11.72 mV/(m/s²); 5–115 mV/g
Input Sensitivity (Reciprocal Velocity)	3.54–22.64 mV/(mm/s); 90–575 mV/(in/s)
Input Sensitivity (Low Frequency Velocity)	3.54–22.64 mV/(mm/s)
Rack Space (Monitor Module)	1 full-height front slot
Rack Space (I/O Modules)	1 full-height rear slot
Buffered Outputs	One coaxial connector per channel (short-circuit protected)
Output Impedance	550 Ω typical
Recorder Output	+4 to +20 mA proportional to monitor full-scale
Recorder Selection	One static data value per channel
Voltage Compliance	+12 V DC maximum
Load Resistance	600 Ω maximum
Resolution	0.3662 µA maximum
Update Rate	<100 ms
Accuracy	±0.05 mA typical; ±0.14 mA over temperature range
Impulse Acceleration Accuracy	±0.33% full-scale typical; ±1% maximum (excluding filters)
Band Start	0° to 359° (1° resolution)
Band Duration	1° to 360° (1° resolution)
Frequency Response (Bias Filter)	-3 dB at 0.01 Hz (1-pole)
Frequency Response (Low-Pass Not OK Filter)	-3 dB at 2400 Hz (1-pole)
Static Value Smoothing Filter	8-revolution average
High-Pass Filter	4-pole, 80 dB/decade, 24 dB/octave
Low-Pass Filter	4-pole, 80 dB/decade, 24 dB/octave
Alert Delay	1–60 s (1 s increments)
Danger Delay	0.1 s nominal or 1–60 s (1 s increments)

Description

The Bentley Nevada 3500/70M 176449-09+135489-03 Recip Impulse Velocity Monitor is a critical protection component designed specifically for reciprocating compressors. It utilizes advanced signal processing technology to monitor cylinder impacts, valve malfunctions, and mechanical loosening. This module supports a "monitoring band" configuration synchronized with crankshaft rotation and features high-performance filtering algorithms and multiple sensor inputs to effectively distinguish between normal mechanical impacts and abnormal shock damage.

Applications

Oil and gas refineries: Operating in reciprocating hydrogen compressor units, monitoring cylinder pulse speed to promptly detect valve ruptures or connecting rod loosening faults.

Large fertilizer plants: Used in reciprocating compressors in ammonia synthesis units, utilizing their "monitoring belt" function to bypass normal mechanical noise and achieve precise monitoring of cylinder impact energy.

Chemical raw material plants: Managing key power units in ethylene compressor rooms, using 4-20 mA recorder outputs to connect equipment status to the DCS system for long-term trend analysis.

Natural gas booster stations: Deployed in pipeline reciprocating compressors in remote areas, utilizing their wide-temperature operating characteristics and high-precision filtering algorithms to reduce the risk of false alarms.

Steel and iron smelting plants: Monitoring large reciprocating air compressors in auxiliary process systems, using multi-channel inputs to achieve centralized online monitoring of multi-stage cylinder status.

Features

Channels: 4 channels for monitoring

Inputs: Accepts input from seismic transducers

Measurement Types: Peak velocity, peak impulse, average velocity, average impulse

Built-in Alarm Relays

Configuration Software: 3500 Rack Configuration Software

Maintenance and Troubleshooting

Troubleshooting: If the recorder output deviates, check if the load resistance is within 600 Ω. If background interference exists, adjust the 4-pole low-pass filter via software or optimize the Band Start/Duration angle parameters.

Maintenance Recommendations: Regularly use the front panel buffer interface to acquire waveforms and verify the consistency of the physical sensor and monitor ranges. When replacing I/O modules, ensure the Special Inhibit contacts are wired correctly to prevent false alarm suppression.

FAQ

Q: What types of sensor inputs does the 3500/70M 176449-09+135489-03 module support?
A: It receives signals from accelerometers or speed sensors to calculate pulse acceleration and reciprocating speed.

Q: What is the “Monitoring Band” function of the 3500/70M 176449-09+135489-03?
A: It defines a 0°–359° crankshaft angle window to monitor signals and reduce background noise.

Q: Does the buffered output on the 3500/70M 176449-09+135489-03 have short-circuit protection?
A: Yes. Each channel includes protection to prevent interference from external analyzers.

Q: How does alarm delay affect protection logic in the 3500/70M 176449-09+135489-03?
A: A 0.1s danger alarm delay enables fast trip response to severe mechanical shocks.

Q: How should Special Inhibit be handled when replacing the 3500/70M 176449-09+135489-03 I/O module?
A: Ensure correct wiring of the interlocking contact (5 Vdc @ 390 μA) to avoid false suppression.