Introduction
The model 330105-02-12-05-12-05 is a Dual-Channel 4-20 mA DC Velocity Seismic Transmitter from the Bently Nevada 3300 series. This advanced device is designed to monitor the casing or absolute vibration (expressed as velocity) at two separate points on a single machine, providing two independent, loop-powered 4-20 mA output signals. It integrates two piezoelectric accelerometers with independent signal conditioning electronics in a single, rugged housing. This configuration is highly efficient for monitoring both drive-end and non-drive-end bearings of a motor or pump, reducing installation points and wiring while providing comprehensive machine coverage.
Parameters / Specifications
The following table outlines the key technical parameters for the 330105-02-12-05-12-05 transducer.
| Parameter | Specification |
|---|---|
| Model Number | 330105-02-12-05-12-05 |
| Description | Dual-Channel 4-20 mA DC Velocity Seismic Transmitter |
| Physical Dimensions | Approx. 78.7 mm (3.10 in) in height (excluding connectors) x 35.1 mm (1.38 in) diameter. [Larger than single-channel units to accommodate dual electronics] |
| Weight | Approx. 0.5 kg (1.1 lb) |
| Measurement | Casing Vibration (Velocity) - Two Independent Channels |
| Output Signal | Two independent 4-20 mA, 2-Wire, Loop Powered signals |
| Velocity Range | 0 to 25.4 mm/s True Peak (0 to 1.0 in/s True Peak) per channel |
| Frequency Response | 4.5 Hz to 1000 Hz (270 CPM to 60,000 CPM) |
| Power Supply | 12 to 30 VDC per channel (requires two separate loop power supplies) |
| Sensitivity | 0.63 mA/mm/s (16 mA/in/s) per channel |
| Electrical Connection | Two independent, integral, two-pin military-style connectors (e.g., MS3106A-20-9S). The -05 suffixes typically specify a connector style and top exit configuration for each channel. |
| Housing Material | Stainless Steel |
| Operating Temperature | -40°C to +85°C (-40°F to +185°F) |
Note: The specific suffixes -02-12-05-12-05 define the internal configuration for each channel, including sensitivity and connector details. The dual-channel design requires two separate power sources and data acquisition channels. Always verify against the official manufacturer's datasheet for the precise configuration.
Application Scenarios
This dual-channel transmitter is used in scenarios where efficient, comprehensive monitoring of a single machine is required, consolidating two measurement points into one device.
Complete Motor and Pump Monitoring:
Ideally mounted on motor and pump bearing housings to simultaneously monitor both the Drive-End (DE) and Non-Drive-End (ODE) bearings with a single sensor body. This provides a complete picture of the machine's mechanical health.
Space-Constrained Installations:
Perfect for applications where space on the machine casing is limited, as it reduces the number of sensor mounting locations and penetration points required while still providing two channels of data.
High-Density Machine Trains:
Used on machine trains with multiple critical points located close together, such as on compressors or gearboxes, where using individual single-channel sensors would be impractical due to space constraints.
Cost-Effective Multi-Point Monitoring:
Reduces installation time, wiring costs, and the number of mounting holes needed compared to installing two separate single-channel transmitters, leading to a lower total cost of ownership for dual-point monitoring.
OEM Integrated Machinery:
Specified by Original Equipment Manufacturers (OEMs) for built-in monitoring on their equipment where reliable, dual-point vibration feedback is required for control and protection systems in a compact form factor.
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