Bently Nevada 3500/42M Data sheet

3500/42M Proximitor Seismic Monitor

Datasheet

Bently Nevada Machinery Condition Monitoring

Description

The 3500/42M Proximitor Seismic Monitor:

l Protects machinery by continuously comparing

monitored parameters against configured alarm
setpoints to drive alarms.

l Communicates essential machine information to both

operations and maintenance personnel.

The 3500/42M Proximitor Seismic Monitor is a four-channel
monitor that accepts input from proximity and seismic
transducers. It conditions the signal to provide vibration and
position measurements and compares the conditioned
signals with user-programmable alarms.

You can program each channel using the 3500 Rack
Configuration Software to monitor and report:

143694 Rev. V

l Radial vibration l REBAM
l Thrust position l Acceleration
l Differential

expansion
l Eccentricity l Circular acceptance region
l Velocity

The monitor channels are programmed in pairs and can
perform up to two of the listed functions at a time. For
example, Channels 1 and 2 can perform one function while
channels 3 and 4 perform another or the same function.

Each channel, depending on configuration, typically
conditions its input signal to generate various parameters
called static values. You can configure alert setpoints for
each active static value and danger setpoints for any two of
the active static values.

l Shaft absolute



3500/42M Proximitor Seismic Monitor
Datasheet 143694 Rev. V

Outputs

Specifications

Inputs

Accepts from 1 to 4 proximity,

Signal

Power
consumption

Input Impedance

Standard I/O

Sensitivity

Radial Vibration

Thrust

Eccentricity

Differential
Expansion

REBAM

Acceleration &
Acceleration2

Velocity &
Velocity2

Shaft Absolute,
Radial Vibration

Shaft absolute,
Direct

Shaft absolute,
Velocity

Circular
Acceptance
Region

velocity or acceleration
transducer signals

7.7 watts, typical

10 kΩ
(Proximitor and acceleration
inputs)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

0.394 mV/μm (10 mV/mil) or

0.787 mV/μm (20 mV/mil)
40 mV/μm (1000 mV/mil) or

80 mV/μm (2000 mV/mil)

10 mV/ (m/s2) (100 mV/g)

20 mV/ (mm/s) pk (500 mV/
(in/s) pk) or

5.8 mV/ (mm/s) pk (145 mV/
(in/s) pk) or
4 mV/ (mm/s) pk (100 mV/ (in/s)
pk)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)
20 mV/ (mm/s) pk (500 mV/

(in/s) pk) or

5.8 mV/ (mm/s) pk (145 mV/
(in/s) pk) or
4 mV/ (mm/s) pk (100 mV/ (in/s)
pk)

See Radial Vibration on the next
page..

Front Panel LEDs

Indicates when the 3500/42M

OK LED

TX/RX LED

Bypass LED

Buffered Transducer
Outputs

Output Impedance 550 Ω
Transducer Power

Supply

Recorder

Voltage
Compliance
(current output)

Resolution

Shaft Absolute
Buffered Outputs

Shaft Absolute
Output Impedance

Output supply
parameters

Proximitor Seismic Monitor is
operating properly.

Indicates when the 3500/42M
Proximitor Seismic Monitor is
communicating with other
modules in the 3500 rack.

Indicates when the 3500/42M
Proximitor Seismic Monitor is in
Bypass Mode.

The front of each monitor has
one coaxial connector for
each channel.

Each connector is short-circuit
protected.

-24 Vdc

+4 to +20 mA
Values are proportional to
monitor full-scale.

The monitor provides
individual recorder values for
each channel.

Monitor operation is
unaffected by short circuits on
recorder outputs.

0 to +12 Vdc range across load

Load resistance is 0 to 600 Ω.

0.3662 µA per bit
±0.25% error at room
temperature
±0.7% error over temperature
range

Update rate approximately 100
ms or less

The Shaft Absolute I/O
modules have one output for
each channel group.

Each output is short-circuit
protected.

300 Ω

See Output Supply Parameters
on page9..

2/18

3500/42M Proximitor Seismic Monitor
Datasheet 143694 Rev. V

Signal Conditioning

Specified at +25 ºC (+77 ºF) unless otherwise
noted.

Radial Vibration

Frequency Response

User-programmable
Single-pole

Direct filter

Gap filter -3 dB at 0.09 Hz

Not 1X filter

Smax 0.125 to 15.8 times running speed

1X and 2X vector
filter

1X and 2X Vector, Not 1X, and Smax
parameters are valid for machine
speeds of 60 cpm to 60,000 cpm.

-3db at 4 Hz to 4000 Hz or
1 Hz to 600 Hz
± 1% accuracy

60 cpm to 15.8 times running
speed
Constant Q notch filter
Minimum rejection in stopband
of -34.9 dB

Constant Q Filter
Minimum rejection in stopband
of -57.7 dB

Eccentricity

Within ±0.33% of full-scale

Accuracy

Frequency Response

Direct filter -3 dB at 15.6 Hz
Gap filter -3 dB at 0.41 Hz

typical
±1% maximum

Acceleration

Within ±0.33% of full-scale

Accuracy

Filter Quality

High-pass

Low-pass



Table 1: Frequency Ranges if Both Channels
of a Channel Pair are Enabled

typical
±1% maximum
Exclusive of filters

4-pole
(80 dB per decade, 24 dB per
octave)

4-pole
(80 dB per decade, 24 dB per
octave)

Accuracy

Exclusive of filtering

Direct and Gap

1X and 2X

Smax Within ±5% maximum

Not 1X

Within ±0.33% of full-scale
typical
±1% maximum

Within ±0.33% of full-scale
typical
±1% maximum

±3% for machine speeds less
than 30,000 cpm
±8.5% for machine speeds
greater than 30,000 cpm

Thrust and Differential Expansion

Within ±0.33% of full-scale

Accuracy

Frequency Response

Direct filter -3 dB at 1.2 Hz
Gap filter -3 dB at 0.41 Hz

typical
±1% maximum

Dual Channel Frequency Response

Low or

Output Type

RMS

Peak

Without

Filter

10 to
30,000
Hz

3 to
30,000
Hz

High
Pass
Filter

10 to
9,155 Hz10 to 9,155 Hz

3 to
9,155 Hz10 to 9,155 Hz

Integration



Table 2: Frequency Ranges if a Single
Channel of a Channel Pair is Enabled

Single Channel Frequency Response

Without Filter

Output Type

RMS 10 to 30,000 Hz 10 to 14,500 Hz

Peak 3 to 30,000 Hz 10 to 14,500 Hz

Low or High

Pass Filter

With

Integration

With

3/18

3500/42M Proximitor Seismic Monitor
Datasheet 143694 Rev. V

Acceleration II

Within ± 0.33% of full scale

Accuracy

Filter Quality

High-pass

Low-pass

Frequency Response

Bias filter -3 dB at 0.01 Hz
Not OK filter -3 dB at 2400 Hz
1X and 2X vector

filter

typical
± 1% maximum
Exclusive of filters

4-pole
(80 dB per decade, 24 dB per
octave)

4-pole
(80 dB per decade, 24 dB per
octave)

Valid for machine speeds of 60
cpm to 100,000 cpm

Table 3: Frequency Ranges for the 3500/42M
Proximitor Seismic Monitor under Different
Options using the Acceleration II Channel
Type

Frequency Ranges

Without Filter

Output Type

RMS 10 to 30,000 Hz 10 to 20,000 Hz

Peak 3 to 30,000 Hz 10 to 20,000 Hz

Low or High

Pass Filter

With

Integration



Velocity and Velocity II

Within ±0.33% of full-scale
typical

Accuracy

Velomitor sensor
accuracy

Velomitor sensor
accuracy with
barriers

Frequency Response

Bias

±1% maximum
+1% -3% with MTL 764(-) Zener
External Barrier
Exclusive of filters

Full Scale 0-0.5: ±3% typical
Full Scale 0-1.0: ±2% typical
Full Scale 0-2.0: ±1% typical

Under radiated immunity
conditions, add ± 11% for all full
scale ranges. The total Velomitor
sensor accuracy will be ± 15%.

-3dB at 0.01 Hz
Velocity II only

Not OK filter

RMS 10 to 5,500 Hz, -3 dB
Peak or peak-to-

peak

1X and 2X vector
filter

Filter Quality

High-pass

Low-pass

-3 dB at 40 Hz
Velocity II only

3 to 5,500 Hz, -3 dB

Valid for machine speeds of 60
to 100,000 cpm
Velocity II only

4-pole
(80 dB per decade, 24 dB per
octave)

2-pole
(40 dB per decade, 12 dB per
octave)



Shaft Absolute, Radial Vibration

Frequency Response

Direct filter

Gap filter -3 dB at 0.09 Hz

1X vector filter

Accuracy

Direct and gap

1X

User-programmable
4 Hz to 4000 Hz or 1 Hz to 600 Hz

Valid for machine speeds of 240
cpm to 60,000 cpm

Within ±0.33% of full-scale
typical
±1% maximum

Within ±0.33% of full-scale
typical
±1% maximum

Shaft Absolute, Velocity

Within ±0.33% of full scale typical

Accuracy

Frequency Response

Peak or
peak-to-peak

Filter Quality

High-pass

Low-pass

1X vector filter

±1% maximum
Exclusive of filters

User-programmable
3 to 4,000 Hz, -3 dB

2-pole
(40 dB per decade, 12 dB per
octave)

2-pole
(40 dB per decade, 12 dB per
octave)

Constant Q Filter
Minimum rejection in stopband

4/18

3500/42M Proximitor Seismic Monitor
Datasheet 143694 Rev. V

of -57.7 dB



Shaft Absolute Buffered Output

Accuracy ±6.0% @ 25 C
Circular

acceptance
region

See Radial Vibration on page3..



REBAM

Frequency Response

Spike

Element

Rotor

Direct

Gap

1X vector filter

Table 4: Summary of the Relationship
between Nominal Shaft Speed and the Valid
Speed Range

Nominal Shaft

Speed (Hz)

10 to <126 0.071 to 160
126 to <252 0.133 to 330
252 to <504 0.25 to 660
504 to 584 0.50 to 750

User-programmable
from 0.152 to 8678 Hz

User-programmable for BPFO
ranging from 0.139 to 3836 Hz

High-pass corner is 0.8x BPFO.
Low-pass corner is 2.2x BPFO.

User programmable from 0.108
to 2221 Hz

Programmable from 3.906 to 14.2
Hz

Selection is determined by Spike
and Rotor filters.

Programmable from 0.002 to 1.0
Hz

Selection is determined by the
Rotor filter.

The range of shaft speeds for
which the value is valid depends
on the nominal shaft speed for
which the channel is configured.

Valid Speed Range (Hz)

limitation of the resultant input signal is
approximately 20 KHz.

Filter Quality

6-pole Elliptic

Spike high-pass

Element
bandpass

Rotor low-pass

Rotor, direct high­pass

Spike, direct low­pass

Gap low-pass

1X amplitude

(155 dB per decade, minimum)

Corner frequency is -0.1 dB.
8-pole Butterworth

(155 dB per decade minimum)

Corner frequency is -3 dB.
6-pole Elliptic

(155 dB per decade, minimum)

Corner frequency is -0.1 dB.
1-pole Butterworth

(18 dB per decade, minimum)

Corner frequency is -3 dB.

Corner is -0.3 dB maximum.

1-pole Butterworth
(18 dB per decade, minimum)

Corner frequency is -3 dB.
Constant Q of 16.67

Stopband frequencies are 0.91
and 1.09 times the running
speed.

Stopband attenuation is -51 dB
minimum.



Accuracy

Within ±0.33% of full scale typical

Amplitude

Phase 3 degrees error, maximum

Channels
enabled

±1% maximum when input signal
is at the center frequency of the
measured value's passband

You can use certain
configurations to enable only
one channel of a channel pair.

See REBAM Channels on page17..



If a multi-event gear or speed wheel
generates the speed input, the upper

5/18

3500/42M Proximitor Seismic Monitor
Datasheet 143694 Rev. V

Filter Tracking / Stepping (Requires a valid speed

signal)

Initial condition Nominal filter set used
Switch from

nominal to lower
filter set

Switch from lower
to nominal filter
set

Switch from
nominal to higher
filter set

Switch from
higher to nominal
filter set

Shaft speed error
condition

Current shaft speed ≤ 0.9 x
(nominal shaft speed)

Current shaft speed ≥ 0.95 x
(nominal shaft speed)

Current shaft speed ≥ 1.1 x
(nominal shaft speed)

Current shaft speed ≤ 1.05 x
(Nominal Shaft Speed)

Nominal filter set used

Physical

Monitor Module (Main Board)

Dimensions
(Height x Width x
Depth)

Weight 0.91 kg (2.0 lb)

I/O Modules (non-barrier)

Dimensions
(Height x Width x
Depth)

Weight 0.20 kg (0.44 lb)

I/O Modules (barrier)

Dimensions
(Height x Width x
Depth)

Weight 0.46 kg (1.01 lb)

241.3 mm x 24.4 mm x 241.8 mm
(9.50 in x 0.96 in x 9.52 in)

241.3 mm x 24.4 mm x 99.1 mm
(9.50 in x 0.96 in x 3.90 in)

241.3 mm x 24.4 mm x 163.1 mm
(9.50 in x 0.96 in x 6.42 in)

Channel
Parameters
(entity)

Seismic Barrier

Circuit
Parameters

Channel
Parameters
(entity)

Alarms

Alarm Setpoints

Accuracy of
alarm setpoints

(PWR) = 237.6 Ω
(SIG) = 4985 Ω

Vmax = 28.0 V
Imax = 115.62 mA
Rmin (PWR) = 237.6 Ω
(SIG) = 4985 Ω

Vmax (PWR) = 27.25 V
Imax (PWR) = 91.8 mA
Rmin (PWR) = 297 Ω

Vmax = 27.25 V
Imax = 91.8 mA
Rmin (PWR) = 297 Ω

Use Rack Configuration Software
to set alert levels for each value
measured by the monitor and
danger setpoints for any two of
the values measured by the
monitor.

Alarms are adjustable from 0 to
100% of full-scale for each
measured value. However, when
the full-scale range exceeds the
range of the transducer, the
range of the transducer will limit
the setpoint.

Within 0.13% of the desired value

Rack Space Requirements

Monitor 1 full-height front slot
I/O Modules 1 full-height rear slot

Barrier Parameters

The following parameters apply to CSA-NRTL/C
and ATEX approvals.

Proximitor Barrier

Vmax (PWR) = 26.80 V
Circuit
Parameters

(SIG) = 14.05 V

Imax (PWR) = 112.8 mA

(SIG) = 2.82 mA Rmin

6/18