Overview
Configured for temporary sensor mounting on ferromagnetic machinery surfaces, the Bently Nevada 46920-01 (46920-01 Magnetic Mounting Base) provides direct mechanical coupling for vibration and velocity transducers associated with the 330500 Velomitor Super Mag series.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 46920-01 |
| Brand | Bently Nevada |
| Operating Temp | -40 deg C to +100 deg C, stated typical range |
| Power Consumption | None; passive mechanical accessory |
| Product Type | Magnetic Mounting Base |
| Associated Series | 330500 Velomitor Super Mag |
| Primary Function | Temporary or semi-permanent vibration sensor mounting |
| Mounting Interface | 1/4-28 UNF, stated in provided data |
| Mounting Surface | Ferromagnetic machinery surfaces |
| Sensor Application | Velocity and vibration transducers |
| Mounting Method | Magnetic attachment |
Magnetic Mounting and Mechanical Coupling
The 46920-01 uses magnetic force to attach a vibration sensor to a ferromagnetic machine surface. Therefore, the mounting surface must provide sufficient magnetic contact area and mechanical stability.
The mounting base supports rapid sensor relocation during vibration measurement. In addition, it avoids permanent drilling or stud mounting when temporary measurement points are required.
For vibration measurements, the mounting interface should remain mechanically rigid. Surface contamination, paint thickness, loose scale, oil, or debris can reduce magnetic contact and alter the mechanical transmission path.
The supplied data identifies a 1/4-28 UNF mounting interface. Verify the mating sensor thread before installation because the supplied information does not define all compatible transducer variants.
Frequently Asked Questions
Q: Does the 46920-01 require electrical power?
A: No. The 46920-01 is a passive magnetic mounting accessory and does not require an electrical supply.
Q: What type of surface can accept the magnetic base?
A: The base is intended for ferromagnetic surfaces such as suitable machine casings, bearing housings, and structural steel surfaces.
Q: Can the 46920-01 provide a permanent sensor mounting point?
A: The supplied data identifies it for temporary or semi-permanent mounting. It does not replace a permanently installed stud where a permanent sensor installation requires one.
Field Installation Guidelines
- Confirm that the machine surface is ferromagnetic before mounting the base.
- Remove loose scale, excessive oil, debris, and other material from the contact area.
- Position the magnetic base on a flat or suitably curved surface with full mechanical contact.
- Verify that the sensor mounting thread matches the specified 1/4-28 UNF interface before tightening.
- Keep the sensor and mounting base mechanically stable during vibration measurement.
- Route the sensor cable so that cable movement does not apply mechanical force to the transducer or mounting base.
- Keep sensor signal cables separated from high-current power conductors where practical to reduce electrical interference.
- For repeatable measurements, use consistent mounting locations and surface preparation.
- Inspect the magnetic attachment before each measurement when the machine is vibrating or operating.
- Do not treat the magnetic mounting base as a substitute for a permanent stud installation when the monitoring design specifies permanent mounting.
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