Introduction
The 3500/32M 184631-02 is a specific configuration of the Velocity Monitor Module within the Bently Nevada 3500 Machinery Protection System. Unlike modules designed for proximity probes measuring shaft vibration, this module is engineered to accept signals from seismic velocity transducers (also known as pickups or sensors). It monitors casing vibration or absolute shaft vibration (when used with a casing-mounted transducer), providing critical data on the mechanical health of machine structures, bearings housings, and overall vibration energy. This makes it essential for monitoring machines where shaft access is not available or for supplementing proximity probe data.
Key Parameters
The following table summarizes the key technical and physical specifications for this module.
| Parameter Category | Specification |
|---|---|
| Model / Part Number | 3500/32M (184631-02) |
| Primary Function | Single or Dual-Channel Casing Vibration Monitoring via Velocity Transducers. |
| Input Channels | Typically 2 independent channels (exact configuration defined by the 184631-02 revision). |
| Input Sensor Type | Accepts signals from piezoelectric velocity transducers (e.g., 100 mV/in/sec sensitivity). |
| Key Measurement | Velocity (in/sec or mm/sec, peak or RMS) as the primary measure of vibration severity. |
| Frequency Range | Typically 10 Hz to 1,000 Hz (or wider), suitable for general machinery vibration monitoring. |
| Alarm Outputs | Programmable Alert and Danger setpoints per channel. |
| Power Supply | Powered from the 3500 rack backplane (+24 VDC). Note: Provides power for 4-wire DC powered transducers if applicable; passive velocity sensors do not require power from the module. |
| Operating Temperature | -30°C to +65°C (standard for 3500 series). |
| Dimensions (H x W x D) | Standard 3500 Series Module Size: 190 mm (H) x 50 mm (W) x 170 mm (D) (Occupies one slot in a 3500 rack). |
| Weight | Approx. 0.6 kg - 0.8 kg (module only). |
| Mounting | Installed in a designated slot of a 3500 rack or frame. |
*Note: The specific input configuration (single/dual channel, integral vs. remote sensor power) is defined by the part number revision (-02). Always verify compatibility with the intended velocity transducer and consult the official Bently Nevada 3500/32M documentation for detailed wiring and configuration guidelines.*
Application Scenarios
This module is widely used for monitoring the overall mechanical condition of machines where shaft-relative measurement is impractical or as a complementary protection layer.
Casing Vibration on Rolling Element Bearing Machines:
Primary Application: Monitoring motors, pumps, fans, and gearboxes equipped with anti-friction (ball or roller) bearings. Since there is no fluid film to measure shaft position, casing vibration measured by a velocity sensor is the most effective indicator of bearing health, imbalance, and misalignment.
General Machinery Health Monitoring:
Provides a broad-spectrum measure of overall vibration severity on a wide range of industrial equipment, from small blowers to large compressors, serving as a first line of defense for condition-based maintenance.
Supplemental Protection for Journal Bearing Machines:
Used alongside proximity probe systems (e.g., 3500/42M) on turbines and compressors to monitor absolute shaft vibration (via a casing-mounted proximity probe with an internal velocity sensor) or to measure casing vibration itself, which can detect structural issues or flow-induced excitations.
High-Temperature or Hazardous Location Monitoring:
Velocity transducers can often be installed in locations where proximity probes cannot survive, providing vibration data for machines operating in extreme environments.
Vertical Pump and Motor Monitoring:
Ideal for monitoring vibration on vertical pumps and motors where mounting a shaft-observing probe is mechanically challenging.
Industry-Wide Application:
HVAC & Utilities: Monitoring large cooling tower fans, air handling units, and industrial blowers.
Water & Wastewater: Protecting critical vertical and horizontal pumps.
Power Generation: Monitoring boiler feed pumps, induced draft fans, and other auxiliary equipment with rolling element bearings.
Manufacturing: Monitoring compressors, machine tools, and conveyor drives across all sectors.
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