3500/70M Recip Impulse Velocity Monitor, China 3500/70M Recip Impulse Velocity Monitor Manufacturers, Suppliers, Factory

Overview

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

Quick Detail

Signal Inputs	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 Reciprocal Velocity	3.54 – 22.64 mV/(mm/s)
Rack Space Requirement – Monitor Module	1 full-height front slot
Rack Space Requirement – I/O Modules	1 full-height rear slot
Front Panel Buffered Outputs	One coaxial connector per channel, short-circuit protected
Output Impedance	550 Ω typical
Recorder Outputs	+4 to +20 mA proportional to monitor full-scale
Recorder Selection	One static data value per channel for recorder output
Voltage Compliance	+12 Vdc 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
Dimension:	2.5x25.6x24cm
Weight:	0.82kg

Description

The 3500/70M is a four-channel monitor designed for reciprocating compressor applications, measuring crankcase and crosshead vibration. Each channel accepts 1–4 proximity probe signals and conditions them to generate impulse acceleration, acceleration 2, reciprocal velocity, and low-frequency reciprocal velocity. The 3500/70M provides user-programmable alert and danger setpoints through 3500 Rack Configuration Software and drives alarms to protect machinery.

Input sensitivity ranges are 0.51–11.72 mV/(m/s²) for impulse and acceleration 2, 3.54–22.64 mV/(mm/s) for reciprocal velocity, and 3.54–22.64 mV/(mm/s) for low-frequency reciprocal velocity. Input impedance is 10 kΩ for acceleration and >1 MΩ for velocity. The 3500/70M delivers +4 to +20 mA recorder outputs per channel, 550 Ω output impedance, +12 Vdc voltage compliance, and supports a load up to 600 Ω. Resolution is 0.3662 µA per bit, with update rates under 100 ms and typical accuracy ±0.05 mA (±0.14 mA over temperature). Alarm time delays are configurable from 0.1–60 seconds.

The 3500/70M ensures real-time vibration monitoring for reciprocating compressors, providing precise static values for control systems and maintenance decisions while preventing equipment damage through rapid alarm activation.

Applications

Monitor Reciprocating Compressor Vibration
The 3500/70M continuously measures impulse acceleration (0.51–11.72 mV/(m/s²)) and reciprocal velocity (3.54–22.64 mV/(mm/s)) across four channels. This allows operators to detect abnormal crankcase and crosshead vibrations. Data analysis shows that channels with higher input sensitivity detect minor vibrations that could indicate early mechanical wear, allowing timely alarm activation.

Integrate Vibration Data into Control Systems
Using +4 to +20 mA recorder outputs per channel, the 3500/70M feeds vibration data into automation systems. Quantitative measurements with 0.3662 µA resolution and <100 ms update rate enable real-time adjustments of compressor speed and operation, reducing the risk of excessive vibration.

Plan Preventive Maintenance
The 3500/70M provides static values smoothed over an 8-revolution average. Analysis of these trends, combined with 0.05 mA typical accuracy, allows maintenance teams to schedule interventions based on actual vibration patterns rather than estimated usage, lowering downtime.

Analyze Transient Vibration Events
With configurable band start (0–359°) and band duration (1–360°), the 3500/70M captures transient events. Filtered data shows spikes in vibration can be isolated to specific crank positions, enabling engineers to adjust load or timing to prevent component stress.

Specifications

Impulse Acceleration Accuracy	±0.33% of full-scale typical, ±1% maximum (exclusive of 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
Frequency Response – Static Values Smoothing Filter	8-revolution average
Filter Quality – High-Pass	4-pole, 80 dB per decade, 24 dB per octave
Filter Quality – Low-Pass	4-pole, 80 dB per decade, 24 dB per octave
Alarm Time Delay – Alert	1 to 60 s, 1 s increments
Alarm Time Delay – Danger	0.1 s nominal or 1 to 60 s, 1 s increments

Competitive Advantage

Four-Channel Precision Monitoring
The 3500/70M delivers four independent channels with high-resolution recorder outputs and input sensitivity up to 22.64 mV/(mm/s), providing accurate multi-point vibration analysis.

Flexible Input and Signal Conditioning
Supporting 2-wire and 3-wire proximity probes with input impedance 10 kΩ–>1 MΩ, the 3500/70M conditions multiple vibration parameters, ensuring precise measurement under varying operating conditions.

Adjustable Alarms for Machinery Protection
Configurable alert and danger delays from 0.1–60 seconds allow the 3500/70M to respond appropriately to both rapid and gradual vibration changes, protecting compressors from overloading or damage.

Rapid Real-Time Response
With <100 ms update rate and +4 to +20 mA recorder outputs, the 3500/70M provides immediate feedback for control and maintenance systems, enabling operators to react quickly to abnormal vibration conditions.

Voltage Compliance for Control Systems
The 3500/70M supports +12 Vdc voltage compliance across 0–600 Ω load, allowing integration with automation systems while preserving accurate signal transmission.