Product Overview
The 3500/42M 176449-02 belongs to the trusted Bently Nevada 3500 series. This monitor accepts up to four transducer inputs. It works with proximity probes, accelerometers, and velocity sensors. The module fits standard 3500 racks. Users can mix sensor types on different channels.
Technical Specifications
Inputs & Signal Conditioning
Channel count: 1 to 4 independent channels
Input impedance: 10 kΩ (suitable for proximity sensors and acceleration inputs)
Transducer power supply: -24 Vdc
Power consumption: 7.7 watts typical
Sensitivity Options (selectable per channel)
Radial vibration: 3.94 mV/µm or 7.87 mV/µm
Thrust & eccentricity: same as radial options
Differential expansion: 0.394 or 0.787 mV/µm
Acceleration: 10 mV/(m/s²) = 100 mV/g
Velocity: 20, 5.8, or 4 mV/(mm/s) peak
Outputs & Interfaces
Buffered transducer outputs: front coaxial per channel
Output impedance: 550 Ω (short circuit protection)
Recorder outputs: 4 to 20 mA per channel
Load resistance: 0 to 600 Ω
Shaft absolute output impedance: 300 Ω
Resolution: 0.3662 µA per bit
Update rate: ≤100 ms
Accuracy & Linearity (at +25°C)
Direct & gap measurement: ±0.33% of full scale typical
1X and 2X vector filters: ±0.33% typical, max ±1%
Smax: within ±5% maximum
Not 1X filter: ±3% (speeds <30k cpm) or ±8.5% ( >30k cpm)
Thrust & differential expansion: ±0.33% typical
Frequency Response & Filtering
Radial direct filter: -3dB at 4-4000 Hz or 1-600 Hz (programmable)
Gap filter: -3dB at 0.09 Hz
Not 1X notch filter: stopband rejection -34.9 dB
1X/2X vector filter: rejection -57.7 dB (constant Q)
Acceleration filters: 4-pole high-pass & low-pass (80 dB/decade)
Velocity RMS range: 10 to 5500 Hz (-3dB)
Velocity peak range: 3 to 5500 Hz (-3dB)
Environmental Limits & Durability
Operating temperature: 0°C to +65°C
Storage temperature: -40°C to +85°C
EMI/RFI immunity: built for harsh industrial environments
Anti-interference: internal filtering reduces electrical noise
Physical Dimensions
Front Panel Indicators
OK LED: shows normal operation of the 3500/42M 176449-02
TX/RX LED: indicates communication with other rack modules
Bypass LED: lights when the monitor is in Bypass Mode
Installation Guide
Insert the 3500/42M 176449-02 into a standard 3500 front slot.
Connect the matching I/O module to the rear slot.
Wire sensors to the internal termination block.
Power up the rack. Check the OK LED for proper startup.
Use Bently Nevada configuration software to set filters and alarms.
Package Contents
1 x 3500/42M 176449-02 monitor module (main board)
1 x I/O module (internal terminations)
No mounting screws or cables included
Common FAQs
Q1: Can I use both proximity probes and accelerometers on the same unit?
Yes. The 3500/42M 176449-02 accepts Prox/Accel on channels 1 through 4. You can freely mix sensor types per channel.
Q2: What is the maximum cable length from sensor to monitor?
For proximity probes, keep cables under 305 meters (1000 feet). For Velomitor sensors, stay below 300 meters.
Q3: Does this module support external zener barriers?
Yes. With MTL 764 barriers, add ±11% error under radiated immunity. Total Velomitor accuracy becomes ±15%.
Q4: How accurate is the Not 1X filter at high machine speeds?
It gives ±3% below 30,000 cpm and ±8.5% above 30,000 cpm. For high speeds, use the 1X vector filter.
Q5: Can I replace a failed unit without shutting down the rack?
Yes. The 3500/42M 176449-02 supports hot-swapping. Remove the old module and insert the new one while the rack runs.
Customer Reviews