Mount these switches through an unthreaded hole in your tank wall and secure with a nut from outside the tank. They activate process equipment such as pumps or motors when the chemical level in your tank reaches the float.

Switch with splash guard minimizes false switch activation caused by splashing liquid.

Mount this switch through an unthreaded hole in your tank wall and secure with a nut from inside the tank. Often used in food-processing applications, they meet NSF/ANSI Standard 169.

Amplify or control electric signals. Transistors are often used to boost weak electrical signals or as switches to rapidly control data transmission and computing signals. The transistor's leads are ordered from left to right with the flat side facing you. The incoming current you intend to control is sent to the emitter (E) for NPN transistors or the collector (C) for PNP transistors. The base (B) controls how much current flows through the transistor. Then current is output to your application through the collector pin for NPN transistors or the emitter pin for PNP transistors.

When you send current to the base, you can control the current flow between the collector and emitter leads. NPN transistors use positive current and voltage at the base to control current flowing from the collector to the emitter. PNP transistors use negative current and voltage at the base to control current flowing from the emitter to the collector.

Maximum current gain is the highest multiplication factor the transistor can boost the current.

Trigger a light, alarm, or other device to signal your door is unlocked. These locks have a magnet on the cam that is detected by a sensor (required, sold separately). When you unlock the door, the magnet moves out of the sensing range, activating a switch that turns your device on or off. Lock the door to reset the switch. When choosing a lock, consider the magnet location that works best for your setup. Install your sensor next to the side of the cam where the magnet is located. You cannot use these locks near existing magnetic fields, since they could interfere with the sensor.

These locks open with a slotted screwdriver (not included) for a simple keying system. Also known as quarter-turn locks, they have a cam that rotates 90° to close enclosure doors. You can adjust the cam’s latching distance, so these locks are best for jobs when precise distances are unknown. Adjust the position of the cam before installing.

A gasket stops dust and water from getting into your sealed enclosure through the lock. This helps you maintain the enclosure’s IP65 and NEMA 4 ratings.

Sensors with a light illuminate when the latch is open, so you can see the inside of your enclosure when you swing open the door.

Single pole, double throw (SPDT) sensors can be set to turn a device from off to on (normally open) or from on to off (normally closed).

Trigger a light, alarm, or other device to signal your door is unlocked. These locks have a magnet on the cam that is detected by a sensor (required, sold separately). When you unlock the door, the magnet moves out of the sensing range, activating a switch that turns your device on or off. Lock the door to reset the switch. When choosing a lock, consider the magnet location that works best for your setup. Install your sensor next to the side of the cam where the magnet is located. You cannot use these locks near existing magnetic fields, since they could interfere with the sensor.

Open these locks with a square key (sold separately)—it matches a keying system that’s common for industrial enclosures and other machinery but is more secure than a hex key or screwdriver. These locks also have a flat, concealed design that stops others from tampering with them using pliers. Also known as quarter-turn locks, they have a cam that rotates 90° to close enclosure doors. You can adjust the cam’s latching distance, so these locks are best for jobs when precise distances are unknown. Adjust the position of the cam before installing.

A gasket stops dust and water from getting into your sealed enclosure through the lock. This helps you maintain your enclosure’s IP65 and NEMA 4 ratings.

Sensors with a light illuminate when the latch is open, so you can see the inside of your enclosure when you swing open the door.

Single pole, double throw (SPDT) sensors can be set to turn a device from off to on (normally open) or from on to off (normally closed).