products

The Bently Nevada 330505 Low Frequency Velocity Sensor is
specifically designed for hydroelectric turbines where slow
rotating speeds require detecting a low signal to noise ratio.
It detects vibration of the stator core, stator frame, and
bearing housing supports. It is designed to provide early
warning of pending machinery problems and to help you
diagnose problems before they become serious.
The sensor measures absolute vibration within the 0.5Hz to
1.0kHz range. Its two-wire design uses moving-coil technology
and embedded signal conditioning circuitry to provide a
voltage output directly proportional to the vibration velocity.
Stator core and stator frame vibration can cause fretting and
damage to the winding insulation. To detect these problems
before serious damage occurs, mount a 330505 sensor on
the outer diameter of the stator core and frame.
Bearing housing vibration can distort levels of vibration
measured by shaft-observing proximity probes. To detect
premature failure of machine components and prevent
significant machine problems, place 330505 sensors in
locations that measure both shaft-relative and bearingabsolute vibration signals. You can mount 330505 sensors to
the bearing housing either as a stand-alone measurement
or in the same orientation as existing proximity sensors.
The 330505 Transducer connects to the 3500/46M Hydro
Monitor, meeting the requirements of International
Organization for Standardization (ISO) Standard 10816-5 for
mechanical vibration on non-rotating parts in hydraulic
power and pumping plants.
Due to the nature of high amplitude, low frequency velocity
events, the 330505 Low Frequency Velocity Sensor is not
recommended for automated machinery protection. Due to
capacitance constraints, this sensor is not approved for
hazardous areas