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Switch
& Sensor Information |
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Switch
& Sensor Terms |
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What Is A
Switch? |
Reed
Magnets |
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What
is a Sensor? |
Hall
Effect and MR Magnets |
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What
are the Different Types of
Switches and Sensors? |
Mechanical
Sensing Option M |
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How
is a Switch Used? |
Solid
State Sensing Option E & Option I |
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How
is a Sensor Used? |
Source
(PNP) |
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How
do I Choose
a Switch or Sensor? |
Sink
(NPN) |
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What
Is A Switch? |
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A switch is a mechanical or solid state device that acknowledges when something takes place. Switches are mounted at the end of stroke on all PHD products to signal that the unit has reached full extend/retract, full
clockwise/ counter-clockwise, or full open/close jaw movement. This is a combination of a switch and a magnetic field. |
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What
is a Sensor? |
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PHD sensors are used only for rotary actuators and grippers. A sensor is an electronic Hall Effect device used to sense full open/close jaw movement on two separate grippers, or full clockwise/counter-clockwise rotation on two separate rotary actuators. A sensor can also be used to sense up to four positions on a single gripper or rotary actuator. |
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What
are the Different Types of Switches and Sensors? |
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Hall
Effect Switch, Hall Effect Sensor, Magnetoresistive Switch, Reed
Switch, Inductive Proximity Switch. |
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How
is a Switch Used? |
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PHD Compact Switches are available for most Tom Thumb® and PHD products. Their compact, low-profile design saves space and provides additional mounting flexibility. We also offer liquid resistant switches for use in applications where coolant or moisture is present. |
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How
is a Sensor Used? |
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Switches are used to signify the end of stroke, rotation, or jaw movement. This is done using a magnet that is attached to a piston inside the tube. The switch will change states when effected by a magnetic field. When it comes into contact with the magnetic field, the switch is then enabled, or “turned on,” and a signal is sent to the load. |
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How
do I Choose a Switch or Sensor? |
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There
are many factors to consider when choosing the right switch or sensor. Most
of these factors are listed on this page under 'Switch and Sensor Terms' below. |
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Switch
and Sensor Terms |
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Reed
Magnets |
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- Option M
must be ordered
- Axial
Polarity
- 50 Gauss
minimum
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Hall
Effect and MR Magnets |
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- Option E
Hall Effect
- Option I
MR
- Radial
Polarity
- 110 Gauss
Minimum
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Mechanical
Sensing Option M |
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Mechanical sensing is PHD’s Reed Switch and applies to switches AC or DC. The switches are glass encapsulated for a long life and protection, with a typical life of 8 million cycles, and low cost. |
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Solid
State Sensing Option E & I |
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Solid State Sensing is PHD’s Hall Effect or Magneto Resistive Switch. Applies to Switches DC only and has no moving parts. These switches have a typical life of forever. |
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Source
(PNP) |
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PNP
(Source) is what everyone is accustomed to, and is the most common
switch. It provides current to the load. |
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Sink
(NPN) |
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NPN
(Sink) is opposite of PNP (Source). It provides a path to
negative switching (true load). |
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