Choosing a Proximity Switch
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Ultrasonic Switches
Detect objects and liquid or material levels to set off actions in your system—regardless of size, shape, or surface finish. These switches send out high-frequency sound waves that target small areas, so the surface and structure of your object won't affect results like photoelectric sensors, which sense using light. This makes them great for materials with uneven surfaces, such as granules and powder. They also sense objects when obscured by smoke, dust, debris, or water, but they don't work as well where there's wind, since it could disrupt their sound waves. Once an object is detected or a set level is reached, the digital output sends a signal to your controller to turn components in your system on or off. Use their plug to quickly connect and disconnect to cables with a socket (sold separately). UL listed, C-UL listed, and CE marked, all meet American, Canadian, and European safety standards.
Switches with two outputs let you set a minimum level on one output and a maximum on the other—for example, you can keep liquid levels constant by turning on a pump when the level drops too low and turning off the pump when it reaches the maximum.
Switches with IO Link connect to a programmable logic controller (PLC), so you can change settings and receive error messages remotely. You need an IO-Link controller (not included) to connect.
Switches with PNP/NPN signal output automatically produce the signal you need based on the connected device.
90° elbow switches are compact to fit in tight spaces. They’re best for conveyors.
Rated IP67, all of these switches seal out dust and water if briefly submersed. NEMA 6 rated switches also stand up to weather and washdowns.

Switches | Cables with Socket | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Outputs | Signal Output Type | Sensing Distance, mm | Input Voltage | Communication Protocol | Dia., mm | Lg., mm | Circuit Protection | Temp. Range, °F | Environmental Rating | Each | Each | ||
Stainless Steel Housing | |||||||||||||
With 4-Pole Micro M12 Plug | |||||||||||||
| 1 | PNP | 40-300 | 10V DC-30V DC | IO Link | 18 | 61 | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 0000000 | 0000000 | 000000 |
| 2 | PNP | 150-1,600 | 10V DC-30V DC | IO Link | 18 | 98 | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 2 | PNP | 250-3,500 | 10V DC-30V DC | IO Link | 30 | 103 | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |

Switches | Cables with Socket | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Outputs | Signal Output Type | Sensing Distance, mm | Input Voltage | Communication Protocol | Dia., mm | Lg., mm | Wd., mm | Ht., mm | Circuit Protection | Temp. Range, °F | Environmental Rating | Each | Each | ||
Plastic Housing | |||||||||||||||
With 4-Pole Micro M12 Plug | |||||||||||||||
| 1 | PNP | 40-300 | 10V DC-30V DC | IO Link | 18 | 38 | 20 | 53 | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 0000000 | 0000000 | 000000 |
| 1 | PNP | 80-1,200 | 10V DC-30V DC | IO Link | 18 | 38 | 20 | 53 | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 1 | PNP/NPN | 100-1,000 | 10V DC-30V DC | __ | 30 | 45 | 40 | 64 | Overload, Reverse Polarity, Short Circuit | -40° to 155° | NEMA 6, IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 1 | PNP/NPN | 200-2,000 | 10V DC-30V DC | __ | 30 | 45 | 40 | 64 | Overload, Reverse Polarity, Short Circuit | -40° to 155° | NEMA 6, IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 1 | PNP/NPN | 300-3,000 | 10V DC-30V DC | __ | 30 | 45 | 40 | 64 | Overload, Reverse Polarity, Short Circuit | -40° to 155° | NEMA 6, IP67 | 0000000 | 000000 | 0000000 | 00000 |
Ultrasonic Transmitters
Measure the distance to objects and the level of liquids and materials despite size, shape, or surface finish, and send that information to other parts of your system. Unlike photoelectric switches, which use light to detect objects, these transmitters emit high-frequency sound waves that target small spots, so the surface and structure of your object won’t affect results. This makes them great for materials with uneven surfaces, such as granules and powder. They also sense objects in dirty and wet places, but they don’t work well where there’s wind, since it could disrupt their sound waves. Use their plug to quickly connect and disconnect to cables with a socket (sold separately). UL listed, C-UL listed, and CE marked, they meet American, Canadian, and European safety standards.
All transmitters have an analog output, which means they continuously send measurements to monitor status and manage components in your system. Some also have a digital output that signals your controller to turn components on or off whenever an object is detected or a set level is reached. Those with IO Link connect to a programmable logic controller (PLC), so you can remotely change settings and receive error messages. You need an IO-Link controller (not included) to connect.
90° elbow transmitters are compact to fit in tight spaces. They’re best for conveyors.
Rated IP67, all of these transmitters seal out dust and water if briefly submersed. NEMA 6 rated transmitters also stand up to weather and washdowns.

Transmitters | Cables with Socket | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Outputs | Signal Output Type | Signal Output | Sensing Distance, mm | Input Voltage | Communication Protocol | Dia., mm | Lg., mm | Housing Material | Circuit Protection | Temp. Range, °F | Environmental Rating | Each | Each | ||
With 4-Pole Micro M12 Plug | |||||||||||||||
Analog | |||||||||||||||
| 1 | __ | 4mA-20mA | 40-300 | 10V DC-30V DC | __ | 18 | 61 | Stainless Steel | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 0000000 | 0000000 | 000000 |
| 1 | __ | 4mA-20mA | 80-1,200 | 10V DC-30V DC | __ | 18 | 61 | Stainless Steel | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
Digital/Analog | |||||||||||||||
| 2 | PNP | 4mA-20mA | 150-1,600 | 10V DC-30V DC | IO Link | 18 | 98 | Stainless Steel | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 2 | PNP | 4mA-20mA | 250-3,500 | 10V DC-30V DC | IO Link | 30 | 103 | Stainless Steel | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |

Transmitters | Cables with Socket | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Outputs | Signal Output Type | Signal Output | Sensing Distance, mm | Input Voltage | Dia., mm | Lg., mm | Wd., mm | Ht., mm | Housing Material | Circuit Protection | Temp. Range, °F | Environmental Rating | Each | Each | ||
With 4-Pole Micro M12 Plug | ||||||||||||||||
Analog | ||||||||||||||||
| 1 | __ | 4mA-20mA | 100-1,000 | 10V DC-30V DC | 30 | 45 | 40 | 64 | Plastic | Overload, Reverse Polarity, Short Circuit | -40° to 155° | IP67, NEMA 6 | 0000000 | 0000000 | 0000000 | 000000 |
| 1 | __ | 4mA-20mA | 200-2,000 | 10V DC-30V DC | 30 | 45 | 40 | 64 | Plastic | Overload, Reverse Polarity, Short Circuit | -40° to 155° | IP67, NEMA 6 | 0000000 | 000000 | 0000000 | 00000 |
| 1 | __ | 0V DC-10V DC | 100-1,000 | 10V DC-30V DC | 30 | 45 | 40 | 64 | Plastic | Overload, Reverse Polarity, Short Circuit | -40° to 155° | IP67, NEMA 6 | 0000000 | 000000 | 0000000 | 00000 |
| 1 | __ | 0V DC-10V DC | 300-3,000 | 10V DC-30V DC | 30 | 45 | 40 | 64 | Plastic | Overload, Reverse Polarity, Short Circuit | -40° to 155° | IP67, NEMA 6 | 0000000 | 000000 | 0000000 | 00000 |
Digital/Analog | ||||||||||||||||
| 2 | PNP | 4mA-20mA | 40-300 | 10V DC-30V DC | 18 | 38 | 20 | 53 | Plastic | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 2 | PNP | 4mA-20mA | 80-1,200 | 10V DC-30V DC | 18 | 38 | 20 | 53 | Plastic | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 2 | PNP | 0V DC-10V DC | 40-300 | 10V DC-30V DC | 18 | 38 | 20 | 53 | Plastic | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |
| 2 | PNP | 0V DC-10V DC | 80-1,200 | 10V DC-30V DC | 18 | 38 | 20 | 53 | Plastic | Overload, Reverse Polarity, Short Circuit | 0° to 155° | IP67 | 0000000 | 000000 | 0000000 | 00000 |

























