Bently Nevada 3500/42M Proximity Seismic Monitor

Bently Nevada 3500/42M Proximity Seismic Monitor

Product core positioning

The 3500/42M is a four channel industrial grade mechanical condition monitoring module launched by Bently Nevada, a brand under Baker Hughes. Its core is used for real-time monitoring and fault warning of vibration, position, and related parameters of rotating machinery such as motors, turbines, compressors, etc. By receiving input signals from proximity sensors and seismic sensors (such as speed sensors and acceleration sensors), adjusting and analyzing the signals, and comparing them with preset alarm thresholds, mechanical protection and status reporting can be achieved to meet the high reliability monitoring needs of industrial production, energy, maritime and other scenarios.

Key technical specifications

1. Input and signal adaptation

Input channels 1-4, supporting signal input from proximity sensors, speed sensors, and acceleration sensors

Typical power consumption is 7.7 watts

Input impedance standard I/O interface: 10 k Ω (proximity and acceleration input)

Sensitivity (Partial Parameters) - Radial Vibration/Thrust/Eccentricity: 3.94 mV/μ m (100 mV/mil) or 7.87 mV/μ m (200 mV/mil)

-Differential expansion: 0.394 mV/μ m (10 mV/mil) or 0.787 mV/μ m (20 mV/mil)

-Acceleration: 10 mV/(m/s ²) (100 mV/g)

-Speed: 20 mV/(mm/s) pk (500 mV/(in/s) pk) and other specifications

2. Output and status indication

(1) Output interface and parameters

Buffer sensor output with 1 coaxial connector per channel, equipped with short-circuit protection, output impedance of 550 Ω

The recorder outputs a+4~+20 mA current signal (proportional to the monitoring full range), supports independent output for each channel, and short circuits do not affect monitoring operation

Voltage compatibility (current output) 0~+12 Vdc load voltage range, load resistance 0~600 Ω

Axis absolute buffer output, 1 output per channel group, with short-circuit protection, output impedance of 300 Ω

Sensor power supply -24 Vdc

(2) Panel indicator light

OK LED monitor lights up when running normally

When the TX/RX LED monitor communicates with other modules in the 3500 rack, it lights up

When the bypass LED monitor enters bypass mode, it lights up

3. Signal conditioning capability

(1) Frequency response (taking radial vibration as an example)

Direct filter user programmable, single pole -3dB frequency: 4 Hz~4000 Hz or 1 Hz~600 Hz, accuracy ± 1%

Gap filter -3 dB frequency 0.09 Hz

1X/2X vector filter constant Q-value filter, minimum attenuation of stopband -57.7 dB, suitable for mechanical speeds of 60~60000 cpm

Non 1X filter 60 cpm~15.8 times speed, minimum attenuation of stopband -34.9 dB

(2) Measurement accuracy (typical value, 25 ℃ environment)

Radial vibration (direct/clearance/1X/2X) ± 0.33% full-scale (typical value), ± 1% full-scale (maximum value)

Thrust/differential expansion/eccentricity ± 0.33% full-scale (typical value), ± 1% full-scale (maximum value)

Acceleration/velocity ± 0.33% full-scale (typical value), ± 1% full-scale (maximum value, excluding filtering effects)

4. Physical and environmental parameters

(1) Size and weight

Monitor module (motherboard) 241.3 mm x 24.4 mm x 241.8 mm (9.50 x 0.96 x 9.52 inches) 0.91 kg (2.0 pounds)

I/O module (without isolation switch) 241.3 mm x 24.4 mm x 99.1 mm (9.50 x 0.96 x 3.90 inches) 0.20 kg (0.44 pounds)

I/O module (with isolation switch) 241.3 mm x 24.4 mm x 163.1 mm (9.50 x 0.96 x 6.42 inches) 0.46 kg (1.01 pounds)

(2) Environmental adaptability

Working temperature: 0 ℃~+65 ℃ (32 ℉~+149 ℉)

Storage temperature -40 ℃~+85 ℃ (-40 ℉~+185 ℉)

Relative humidity 20%~80% RH (non condensing)

Protection level module body IP20 (suitable for installation inside the control cabinet)

Core functions and configurations

1. Multi parameter monitoring capability

Support programming each channel through 3500 rack configuration software to achieve the following monitoring functions (channel paired programming, each pair can achieve 2 functions simultaneously):

Radial vibration, thrust position, differential expansion, eccentricity, velocity, acceleration, absolute shaft vibration, circular acceptance region, etc.

2. Alarm and delay settings

Alarm threshold: An "Alert" threshold can be configured for each active static value, and a "Danger" threshold can be configured for any two active static values. The threshold range is 0-100% full scale (limited by the sensor range), and the threshold accuracy is ± 0.13% of the target value.

Alarm delay:

Non axial absolute velocity and REBAM type: warning 1-60 seconds (1-second step), danger 0.1 seconds or 1-60 seconds (0.5-second step);

REBAM type: Both warning and danger are calculated with a minimum value of 400 seconds (warning with a 1-second step and danger with a 0.5-second step).

3. Hazardous Area Certification and Compliance

Electromagnetic compatibility (EMC) complies with the EU EMC Directive 2014/30/EU, EN 61000-6-2 (industrial environment immunity), EN 61000-6-4 (industrial environment emission)

Electrical safety complies with the EU Low Voltage Directive 2014/35/EU, EN 61010-1 standard; UL 60950 certification

Environmental Protection (RoHS) Compliant with EU RoHS Directive 2011/65/EU