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Mechanical condition monitor
Converts a monitored mechanical condition into an electrical alarm or protection signal.
Protection functions
Symbols · VS
Vibration sensor
Sensor on a machine bearing that measures vibration and feeds a monitor or relay for alarm and trip.
In plain English
What does Vibration sensor mean?
A vibration sensor is mounted on a machine bearing housing or near the shaft and produces a signal related to vibration, either as raw acceleration or as a processed velocity output in a 4-20 mA loop. It feeds condition monitoring systems and machine protection relays that alarm and trip large motors, generators and fans.
A simple example
Accelerometers, velocity sensors and non-contact proximity probes measure different things and suit different machines. The symbol does not show which type is used, the measuring axis or the alarm levels, which are machine-specific and should be in the instrument schedule.
What the drawings help you do
Identify sensor type and measuring axis. Find the alarm and trip levels in the monitoring settings. A vibration sensor produces a measurement signal; a vibration switch only changes a contact at a set level.
This particular reference
Sensor on a machine bearing that measures vibration and feeds a monitor or relay for alarm and trip. A vibration sensor produces a measurement signal; a vibration switch only changes a contact at a set level.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Coil
- A wound conductor that can produce a magnetic field when energised.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
Read the source: AutoCAD Electrical: Instrumentation and sensors · Electrical and physical sensing functions
Schematic · VS
What it represents
A vibration sensor is mounted on a machine bearing housing or near the shaft and produces a signal related to vibration, either as raw acceleration or as a processed velocity output in a 4-20 mA loop. It feeds condition monitoring systems and machine protection relays that alarm and trip large motors, generators and fans.
Accelerometers, velocity sensors and non-contact proximity probes measure different things and suit different machines. The symbol does not show which type is used, the measuring axis or the alarm levels, which are machine-specific and should be in the instrument schedule.
How to read it
- Identify sensor type and measuring axis.
- Find the alarm and trip levels in the monitoring settings.
Information to show or reference
- State sensor type and axis
- Show loop or signal wiring
- Reference alarm and trip levels
A distinction that matters
A vibration sensor produces a measurement signal; a vibration switch only changes a contact at a set level.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Instrumentation and sensors
Public AutoCAD Electrical instrumentation and sensor family.
Electrical and physical sensing functions
Public overview of electrical and physical sensing functions.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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