Bently Nevada 3500/44M Data sheet
3500/44M Aeroderivitive GT Vibration
Monitor
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The 3500/44M Aeroderivitive GT Vibration Monitor is a fourchannel instrument designed for aeroderivative gas turbine
applications. It:
l Continuously monitors machinery by comparing
monitored parameters against configured alarm
setpoints to drive alarms
l Communicates essential machine information for both
operations and maintenance personnel
The 3500/44M 's Aero GT I/O modules interface to Velomitor
sensors and accelerometers through Bently Nevada interface
modules. The monitor uses the Prox/Velom I/O to interface to
our .
Using the 3500 Rack Configuration Software, you can
configure the 3500/44M Aeroderivitive GT Vibration Monitor for
the following filter options:
l Signal Integration
l 1X vibration tracking
l Band-pass vibration
143441 Rev. R
The 3500/44M Aeroderivitive GT Vibration Monitor accepts
input from two separate Keyphasor signals, allowing each
channel pair to use a different tracking filter.
You can configure multimode channels to have up to eight
sets of alarm parameters including alert and danger
setpoints and alarm time delays. Each set may be configured
for a specific machine mode.
As the machine changes modes, the monitor can switch to a
specific set using contacts on multimode I/O modules or
software commands through a communications gateway.
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Outputs
Specifications
Inputs
Accepts 1 to 4 signals from
Signal
Power
consumption
Input Impedance
Aero GT I/O
Prox/Velom I/O
and
Multimode
Prox/Velom I/O
Sensitivity
Aeroderivative
Aeroderivative2
and
Multimode
Aeroderivative
interface modules (part numbers
86517 and 86497), velomitors
and accelerometers
7.7 watts, typical
Greater than 95 kΩ
(Proximitor and acceleration
inputs)
10 kΩ for Prox/Accel
3.5 MΩ for Velomitor
3.94 mV/(mm/s) (100mV/(in/s))
or
5.71 mV/(mm/s) (145mV/(in/s))
3.94 mV/(mm/s) (100mV/(in/s)),
5.71 mV/(mm/s) (145mV/(in/s)),
10.19 mV/(m/s2) (100 mV/g),
2.55 mV/(m/s2) (25 mV/g) or
1.02 mV/(m/s2) (10 mV/g)
Front Panel LEDs
Indicates when the 3500/44M
OK LED
TX/RX LED
Bypass LED
Aeroderivitive GT Vibration Monitor is
operating properly.
Indicates when the 3500/44M
Aeroderivitive GT Vibration Monitor is
communicating with other modules in
the 3500 Rack.
Indicates when the 3500/44M
Aeroderivitive GT Vibration Monitor is in
Bypass Mode.
Buffered
Transducer
Outputs
Output
Impedance
Transducer
Power
Supply
Recorder
The front of each monitor has one
coaxial connector for each channel.
Each connector is short-circuit
protected.
550 Ω
-23 Vdc nominal at 43 mA max
+4 to +20 mA
Output is proportional to monitor fullscale.
One output is provided for each
channel.
Voltage
Compliance
(current
output)
Resolution
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 100 ms or less
2/10
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Signal Conditioning
Specified at +25ºC (+77ºF) unless
otherwise noted.
Aeroderivative
Within ±0.33% of full-scale
Accuracy
Frequency Response
Direct signal 4 Hz to 30 kHz, -3 dB
Direct Signal - Bandpass Filter
Low-pass corner 200 Hz (-3 dB)
Low-pass rolloff
High-pass corner 25, 75 or 100 Hz (-3 dB)
High-pass rolloff
Direct Signal - Tracking Filter
Tracking filter
Constant Q
Rolloff
typical
±1% maximum
Exclusive of filters
10-pole
200 dB per decade
60 dB per octave
10-pole
200 dB per decade
60 dB per octave
Valid for machine speeds of 60
to 240,000 cpm
User-configurable by selecting
one of 22 normal operating
speeds from 2,400 to 18,000 RPM
and by bandwidth of 3 or 5Hz
6-pole
120 dB per decade
36 dB per octave
Aeroderivative 2 and Multimode
Aeroderivative
Within ±0.33% of full-scale
Accuracy
Frequency Response
Direct Signal - Bandpass Filter
Non-integrated
velocity
Integrated
velocity
Non-integrated
acceleration
Integrated
acceleration
Bias low-pass
filter
Bandpass Filter
Low-pass cutoff
frequency
Low-pass rolloff
High-pass cutoff
frequency
High-pass rolloff
typical
±1% maximum
Exclusive of filters
4 Hz to 5500 Hz (-3 dB)
18 Hz to 5500 Hz (-3 dB)
4 Hz to 30,000 Hz (-3 dB)
18 Hz to 14,500 Hz (-3 dB)
0.01 Hz (-3 dB)
Configurable between 100 Hz
and 5500 Hz (-3 db)
8-pole
160 dB per decade
48 dB per octave
Configurable between 10 Hz and
1000 Hz (-3 dB)
8-pole
160 dB per decade
48 dB per octave
Tracking filter
Tracking Filter
Constant Q
Rolloff
3/10
Tracking filter is valid for machine
speeds of 60 to 300,000 cpm
User configurable
You can select one of 35 normal
operating speeds from 2,400 to
30,000 RPM and bandwidth of 3
or 5 Hz.
6-pole
120 dB per decade
36 dB per octave
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