What is Proximity?

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What is Proximity?

• Created by ProvibTech

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Proximity Outline

• Definition of Proximity?
• What is a Proximity Sensor?
• Why use a Proximity Sensor?
• When to use a Proximity Sensor/Transmitter?
• How to use a Proximity Sensor?
• Proximity Transmitters?

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Definition of Proximity?

• Nearness in place, time, order, occurrence, or
  relation
• The region close around a person or thing
• Distance is a numerical description of how far
  apart objects are

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What is a Proximity Sensor?

• Detects presence of nearby objects without any
  physical contact
• Detects movement or the presence of an object and
  converts it to an electrical signal
• often emits an electromagnetic or electrostatic
  field and looks for changes in the field or
  return signal

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Electromagnetism

• Magnetism arising from electric charge in motion

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Electrostatic

• The charge build up that usually occurs because
  of electron imbalance at the surface of materials

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Types of Detection Systems

• Eddy Current or Inductive
• generated in metallic sensing objects by
  electromagnetic induction
• Capacitive
• systems that detect changes in electrical
  capacity when approaching the sensing object
• Magnetized
• systems that use magnets and reed switches

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Why use a Proximity Sensor?

• Because ProvibTech made it!

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Why use a Proximity Sensor?

• High Reliability
• Machine vibration monitoring
• Measure the variation in distance between a shaft
  and its support bearing
• Long functional life
• Absence of mechanical parts
• Lack of physical contact between sensor and the
  sensed object

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When to use a Proximity Sensor/ Transmitter

• If needing to measure the following
• Radial vibration
• Axial thrust position/vibration
• Shaft radial position
• Vibration Amplitude and Phase Angle
• Eccentricity
• Phase Reference

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When to use a Proximity Sensor/ Transmitter Contd

• Radial Vibration
• Vibration in a direction perpendicular to the
  centerline of a shaft or rotor.
• Used for indicating bearing condition
• Measuring machine malfunction
• Rotor imbalance
• Misalignment
• Shaft crack
• Potential bearing failure

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When to use a Proximity Sensor/Transmitter Contd

• Axial Thrust Position/Vibration
• Vibration in the direction of the centerline of a
  shaft or rotor.
• Determining thrust bearing wear
• Shaft radial position
• Determining shaft position relative to rotor
  amplitude angle
• Indicator of rotor stability and shaft alignment
• Vector monitoring

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When to use a Proximity Sensor/Transmitter Contd
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When to use a Proximity Sensor/ Transmitter Contd

• Eccentricity
• Measures the shaft bow during startup of large
  turbine machinery
• Phase Reference
• Measures shaft rotation speed and phase angle of
  shaft vibration for monitoring and diagnostic
  purposes

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When to use a Proximity Sensor/Transmitter

• Vibration amplitude and Phase Angle
• Diagnostic information in Polar and Bode formats

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How to use a Proximity Sensor?

• Things Needed
• Probe
• Extension cable
• Driver

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How to use a Proximity Sensor?

• This is how the complete system looks once
  everything is connected together

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How to use a Proximity Sensor?

• When using a proximity sensor, distance is always
  the most important thing
• Ideal GAP voltage -10 VDC but -8 to
• -12 VDC is also OK

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Proximity Transmitters

• TR3101
• Radial Vibration Transmitter
• 3 wire Transmitter
• TR3102
• Axial Vibration Transmitter
• 3 wire Transmitter
• TR4101
• Radial Vibration Transmitter
• 2 wire Loop-Powered Transmitter
• TR4102
• Axial Vibration Transmitter
• 2 wire Loop-Powered Transmitter