Proximity sensors are widely used in different industries, including automotive, manufacturing, and robotics. These sensors detect the presence of an object without physical contact, making them useful in a wide range of applications. In this article, we will focus on the 2-wire AC proximity sensor wiring diagram and how it works.
What is a 2-Wire AC Proximity Sensor?
A 2-wire AC proximity sensor is a type of inductive sensor that operates on alternating current. It detects metallic objects by generating an electromagnetic field around the sensing face. When a metal object enters this field, it disturbs the field, which triggers the sensor output.
Unlike 3-wire sensors, 2-wire sensors have only two wires: a brown wire for power and a blue wire for the signal. The brown wire is connected to the power supply, and the blue wire is connected to the load.
2-wire sensors are easy to install and are often used in applications where space is limited or where there are many sensors in close proximity.
Wiring a 2-Wire AC Proximity Sensor
Wiring a 2-wire AC proximity sensor is simple and straightforward. The sensor has two wires: a brown wire and a blue wire. The brown wire is connected to the power supply, and the blue wire is connected to the load.
The power supply should match the sensor’s voltage rating, which is typically between 10-30V AC/DC. The load can be a relay, a PLC, or any other device that can receive a voltage signal.
It’s important to note that the blue wire is not a ground wire. It carries the sensor output signal, which is a voltage signal that varies depending on the proximity of the metal object to the sensor.
2-Wire AC Proximity Sensor Wiring Diagram
The following diagram shows a typical wiring diagram for a 2-wire AC proximity sensor:
| Brown wire | Power supply (+) |
| Blue wire | Load |
In this diagram, the brown wire is connected to the positive terminal of the power supply, and the blue wire is connected to the load. When a metallic object enters the sensing field, the sensor output voltage on the blue wire changes.
FAQ
What is the sensing range of a 2-wire AC proximity sensor?
The sensing range of a 2-wire AC proximity sensor depends on its diameter and the type of metal being detected. Typically, the sensing range is between 1-10mm.
Can a 2-wire AC proximity sensor be connected in parallel?
Yes, 2-wire AC proximity sensors can be connected in parallel, but it’s important to ensure that the power supply can handle the additional current.
What is the difference between a 2-wire and a 3-wire proximity sensor?
The main difference between a 2-wire and a 3-wire proximity sensor is the number of wires they have. 2-wire sensors have only two wires: a brown wire for power and a blue wire for the signal. 3-wire sensors have three wires: a brown wire for power, a blue wire for the signal, and a black wire for ground.
Another difference is that 2-wire sensors are easier to install and are often used in applications where space is limited or where there are many sensors in close proximity.
What are the advantages of using 2-wire AC proximity sensors?
The advantages of using 2-wire AC proximity sensors include:
- Easy to install
- No need for a separate ground wire
- Low power consumption
- Low cost
What are the disadvantages of using 2-wire AC proximity sensors?
The disadvantages of using 2-wire AC proximity sensors include:
- Short sensing range
- Susceptible to noise and interference
Despite these disadvantages, 2-wire AC proximity sensors remain popular due to their simplicity and low cost.
Conclusion
In summary, the 2-wire AC proximity sensor is a simple, easy-to-install sensor that detects the presence of metallic objects without physical contact. It has only two wires, a brown wire for power and a blue wire for the signal. Wiring a 2-wire AC proximity sensor is simple and straightforward, and it can be connected in parallel with other sensors. If you need a simple and affordable way to detect metallic objects, a 2-wire AC proximity sensor may be the right choice for your application.
