Proximity Sensors and Accelerometers
Acceleration & Velocity Sensors
The evolution of our current velocity sensors and accelerometers began with velocity sensors that offered a self-generating moving-coil design used by geologists to measure movement in the earth’s crust. Today we still refer to “seismic” sensors in a nod to their origin.
These early sensors yielded to the introduction of rugged solid-state accelerometers, later ushering in today’s integrated accelerometers that deploy signal processing circuitry for output signals using velocity rather than acceleration.
Our experience and expertise developed over decades offers a selection of first-rate casing-mounted accelerometers and velocity sensors with a variety of models for specific applications.
Would you like to learn more?
Acceleration & Velocity Sensors Product Overview
The Acceleration and Velocity Sensors each come with features to help keep your machinery in its best condition. Both can handle extreme heat. The velocity sensor is made to be self-powered, radiation resistant, and flexible to suit your plant, while the acceleration sensor protects from electrical hazards and offers portable data collectors.
- Withstands Extreme Heat
- Flexible and Reliable
- Radiation Resistant
- Sense Low-Frequencies
- Isolates Electricity
- Withstands Extreme Heat
- Monitors Gearmesh Frequencies
- Provides Portable Data Collectors
Our 330530 Radiation Resistant Velomitor is a rugged, 2-pin integrating accelerometer that blocks gamma radiation with a performance guarantee to a maximum absorbed dose of 12.0 Mrad while offering sensitivity in the range of 3.94mV/mm/s (100 mV/in/s) ±5%. The 330530 Radiation Resistant Velomitor also can operate with a maximum cable length of 305 m (1,000 ft) and in addition to radioactive environments, is also approved for use in multiple hazardous environments.
Bently Nevada's 330750 and 330752 High-Temperature Velomitor sensors offer a unique design with the sensing element segregated from the signal conditioning electronics. Due to this design, the Sensing head can be installed on surfaces up to 400°C (752°F) with signal conditioning electronics installed in a cooler location thus still offering sensitivity in the range of 5.7 mV/mm/s (145 mV/in/s) ±5%. These high-temp velomitor sensors can operate with a maximum cable length of 305 m (1,000 ft) with no signal degradation, and offer a broad frequency range: 15 Hz to 2000 Hz ± 3.0 dB or 20 to 1000 Hz ±0.9 dB.
The 190501 Velomitor CT (Cooling Tower) is a low-frequency version of our standard 330500 Velomitor, with a sensor for use in hazardous areas. The 190501 has a unique frequency range which is adjusted downward to 3.0 Hz to 900 Hz ±1.0 dB or 1.5 Hz to 1.0 kHz ±3.0 dB to enable velocity sensor to measure vibration for fans running as low as 90 rpm. While capable of delivering signals with cable lengths up to 305 m (1,000 ft), the 190501 still offers the sensitivity you need (3.94mV/mm/s (100 mV/in/s) ±5%).
The 330500 Velomitor* is a rugged, 2-pin, integrating piezo-accelerometer that is especially suited for condition monitoring of machines with rolling-element bearings and where vibration measurements in units of velocity are most useful. Designed with multiple approvals for Hazardous Areas, the 330500 works with cable lengths up to 305 m (1,000 ft) while still delivering excellent sensitivity - 3.94mV/mm/s (100 mV/in/s) ±5% - along with a frequency range of 4.5 Hz to 5 kHz ±3.0 dB or 6.0 Hz to 2.5 kHz ±0.9 dB.
The Bently Nevada 330505 Low-Frequency Velocity Sensor offers a 2-pin moving coil design with onboard signal processing circuitry to measure bearing casing vibration on slow-speed hydroelectric turbines. The sensor is optimized to measure vibration below 4 Hz with a high degree of sensitivity (20 mV/mm/s (508mV/in/s) ±10%) and a wide frequency range (0.5 Hz to 1000 Hz ± 3.0 dB or 1 Hz to 200 Hz ± 0.9 dB) with cable lengths up to 305 m (1,000 ft). Note that this sensor is NOT rated for use in hazardous environments.
Our 330525 Velomitor XA Piezo-Velocity Sensor is a more robust version of our 330500 Velomitor - for when you need to data from harsher environments. The 330525 offers a 316L stainless steel case, unique weatherproof connector and cable assembly permit mounting without housing. Designed to withstand various hazardous environments while still offering a great degree of sensitivity (3.94mV/mm/s (100 mV/in/s) ±5%) coupled with a wide frequency range (4.5 Hz to 2 kHz ±3.0 dB or 6.0 Hz to 1 kHz ±0.9 dB) and the ability to operate with cable lengths up to 305 m (1,000 ft).
Bently Nevada offers the following services that will support your Acceleration and Velocity Sensors in keeping your machinery in the best condition:
- System Maintenance & Availability
- Site Project Management
- Design, Installation & Commissioning
The Acceleration Sensors and Velocity Sensors work hand in hand with the following software: