Choosing a Proximity Switch
More
Cut-to-Length Level Switches for Conductive Liquids
Cut the probes on these switches to fit the size of your tank. They’re designed to use the properties of conductive liquid for operation, and actuate when conductive liquid reaches the probes to close the circuit. Do not use in flammable liquids. Mount them vertically through the top of your tank.
Switches with two probes detect one level change.
Switches with three probes detect two level changes, so they can activate your equipment when your tank is empty and when it’s full.
Level Switches | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Probes | Replacement Probes | |||||||||||||||
| No. of | Lg. | Pipe Size  | Thread Type | Gender | Max. Pressure | Temp. Range, °F | Switch Starting Position | Industry Designation | Current | Electrical Connection | Includes | Specifications Met | Each | Each | ||
120V AC Input Voltage | ||||||||||||||||
Aluminum Body | ||||||||||||||||
| 2 | 12" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 0000000 | 000000000 | 000000 |
| 2 | 18" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 00000000 | 000000000 | 000000 |
| 2 | 24" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 00000000 | 000000000 | 000000 |
| 2 | 36" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 00000000 | 000000000 | 000000 |
| 3 | 12" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 000000 | 000000000 | 00000 |
| 3 | 18" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 00000000 | 000000000 | 000000 |
| 3 | 24" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 00000000 | 000000000 | 000000 |
| 3 | 36" | 2 | NPT | Male | 250 psi @ 70° F | -40° to 150° | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 10 A @ 120 V AC | Screw Terminals | Relay | UL Listed, CSA Certified | 00000000 | 00000000 | 000000000 | 000000 |
Noncontact Level Switches for Conductive Liquids
Measure the level of conductive liquids without drilling a hole in your tank—these switches mount to the outside of the tank and track the capacitance between them and the tank’s contents. Use them on nonconductive plastic or glass wall tanks; they’re not compatible with metal tanks. They automatically adapt to your tank’s wall thickness, making them ready to use. These switches only respond when the liquid reaches the desired level, so foam and residue on the top of the liquid won’t trigger them early. For even more challenging setups, such as those with thick, sticky fluids, or if your tank has walls as thick as 10 mm, you can teach these switches to avoid false detections. All have LED indicators to show their power and output status.
Made of plastic, their body is chemical resistant and NEMA and IP rated, so it keeps out dust and dirt, as well as drips of oil and jets of hot water. UL listed, C-UL listed, and CE marked, they meet U.S., Canadian, and European Union safety standards.
Mount these switches directly on your sight glass using their adhesive back or use the included mounting bracket if you’ll need to remove them frequently. They also include foam pads for mounting them using straps around the outside of your tank.
PNP switches communicate with your system by sending a positive signal. NPN switches send a negative signal to communicate with your system.
Switches with an M8 4-pin connection have a standard plug that’s easy to connect. Switches with wire leads need to be hardwired, so use them in applications where you won’t move them often.
| Signal Output Type | Width | Height | Thickness | Temperature Range, °F | Switch Starting Position | Industry Designation | Current | Environmental Rating | Each | |
10V DC/30V DC Input Voltage | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Polycarbonate/PBT Plastic Blend Body | ||||||||||
| PNP | 5/8" | 1 5/16" | 5/16" | -10° to 175° | 1 Off (Normally Open) | SPST-NO | 0.1 A @ 30 V DC | NEMA 4X, NEMA 12, IP68, IP69K, IP66 | 0000000 | 0000000 |
| PNP | 5/8" | 1 5/16" | 5/16" | -10° to 175° | 1 On (Normally Closed) | SPST-NC | 0.1 A @ 30 V DC | NEMA 4X, NEMA 12, IP68, IP69K, IP66 | 0000000 | 000000 |
| Signal Output Type | Width | Height | Thickness | Temperature Range, °F | Switch Starting Position | Industry Designation | Current | Wire Lead Length, ft. | Environmental Rating | Each | |
10V DC/30V DC Input Voltage | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Polycarbonate/PBT Plastic Blend Body | |||||||||||
| PNP | 5/8" | 1 5/16" | 5/16" | -10° to 175° | 1 Off (Normally Open) | SPST-NO | 0.1 A @ 30 V DC | 6 | NEMA 4X, NEMA 12, IP68, IP69K, IP66 | 0000000 | 0000000 |
| PNP | 5/8" | 1 5/16" | 5/16" | -10° to 175° | 1 On (Normally Closed) | SPST-NC | 0.1 A @ 30 V DC | 6 | NEMA 4X, NEMA 12, IP68, IP69K, IP66 | 0000000 | 000000 |
| NPN | 5/8" | 1 5/16" | 5/16" | -10° to 175° | 1 Off (Normally Open) | SPST-NO | 0.1 A @ 30 V DC | 6 | NEMA 4X, NEMA 12, IP68, IP69K, IP66 | 0000000 | 000000 |
| NPN | 5/8" | 1 5/16" | 5/16" | -10° to 175° | 1 On (Normally Closed) | SPST-NC | 0.1 A @ 30 V DC | 6 | NEMA 4X, NEMA 12, IP68, IP69K, IP66 | 0000000 | 000000 |
Level Switches for Conductive Liquids
Designed to use the properties of conductive liquid for operation, these switches actuate when conductive liquid reaches the probes on the tip to close the circuit. They can be used with dirty fluid and liquid with high solid content, but are not for use with flammable liquids. Mount them horizontally or vertically. All are rated NEMA 6 for protection from washdowns.
| Pipe Size | Thread Type | Gender | Min. Specific Gravity | Max. Pressure | Temp. Range, °F | Insertion Dp. | Switch Starting Position | Industry Designation | Current | Probe Material | Electrical Connection | Wire Lead Lg., ft. | Environmental Rating | Each | |
PPS Plastic Body | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/4 | NPT | Male | 1 | 290 psi @ 70° F | -10° to 175° | 1 1/2" | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 316 Stainless Steel | Wire Leads | 6 | IP68, NEMA 6 | 0000000 | 0000000 |
| 3/4 | NPT | Male | 1 | 290 psi @ 70° F | -10° to 175° | 3" | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 316 Stainless Steel | Wire Leads | 6 | IP68, NEMA 6 | 0000000 | 000000 |
Polypropylene Plastic Body | |||||||||||||||
| 3/4 | NPT | Male | 1 | 85 psi @ 70° F | -10° to 140° | 1 1/2" | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 316 Stainless Steel | Wire Leads | 6 | IP68, NEMA 6 | 0000000 | 000000 |
| 3/4 | NPT | Male | 1 | 85 psi @ 70° F | -10° to 140° | 3" | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 316 Stainless Steel | Wire Leads | 6 | IP68, NEMA 6 | 0000000 | 000000 |