3 wire transmitters are used in various industrial applications to measure level, pressure, temperature, and other variables. They are commonly used because of their accuracy, reliability, and ease of installation. However, wiring a 3 wire transmitter can be a bit tricky. In this article, we will guide you through the 3 wire transmitter wiring diagram and explain how to properly wire it.
What is a 3 Wire Transmitter?
A 3 wire transmitter is a type of sensor that converts physical variables into electrical signals. It consists of a sensing element, an electronics module, and three wires that connect to the control system. The electronics module amplifies and conditions the signal, while the three wires transmit the signal to the controller or receiver. A 3 wire transmitter is different from a 2 wire transmitter, which only has two wires, because it provides a separate power supply and signal output.
The 3 Wire Transmitter Wiring Diagram
The 3 wire transmitter wiring diagram consists of three wires – a power wire, a signal wire, and a ground wire. The power wire supplies power to the transmitter, the signal wire transmits the analog signal to the receiver, and the ground wire completes the circuit. The wiring diagram may vary depending on the manufacturer, but the basic concept remains the same.
The power wire is usually connected to a power source, such as a power supply or battery. The voltage can range from 10 to 36 volts DC or AC, depending on the model. The signal wire is connected to the analog input of the controller or receiver. The voltage output can vary depending on the measurement range, but it is usually between 4 and 20 milliamps. The ground wire is connected to a common ground, which is usually the chassis or earth ground.
Table 1: Wiring Color Codes
| Wire Color | Function |
|---|---|
| Red | Power |
| Yellow | Signal |
| Green | Ground |
Wiring a 3 Wire Transmitter
Before wiring a 3 wire transmitter, you need to make sure that the power source and the receiver are compatible with the transmitter. Check the voltage and current ratings to avoid damage to the transmitter or the control system.
To wire a 3 wire transmitter, follow these steps:
- Turn off the power to the control system.
- Locate the power, signal, and ground terminals on the transmitter.
- Strip the wire ends of the power, signal, and ground wires.
- Connect the red wire to the power terminal of the transmitter and the power source.
- Connect the yellow wire to the signal terminal of the transmitter and the signal input of the receiver.
- Connect the green wire to the ground terminal of the transmitter and the common ground of the receiver.
- Turn on the power to the control system and test the transmitter.
FAQ
Q: What is the difference between a 2 wire and a 3 wire transmitter?
A: A 2 wire transmitter only has two wires, which provide both power and signal output. A 3 wire transmitter has a separate power supply and signal output, which provides better accuracy and reliability.
Q: What is the voltage output of a 3 wire transmitter?
A: The voltage output of a 3 wire transmitter can vary depending on the measurement range, but it is usually between 4 and 20 milliamps.
Q: How do I wire a 3 wire transmitter?
A: To wire a 3 wire transmitter, connect the power wire to the power source, the signal wire to the analog input of the receiver, and the ground wire to the common ground of the receiver.
Q: Can I use a 3 wire transmitter with a 2 wire receiver?
A: No, a 3 wire transmitter cannot be used with a 2 wire receiver because they have different wiring configurations. A 2 wire transmitter can be used with a 3 wire receiver, but it will not provide optimal performance.
Q: What is the typical voltage range for a 3 wire transmitter?
A: The voltage range for a 3 wire transmitter can vary, but it is usually between 10 and 36 volts DC or AC, depending on the model.
Conclusion
Wiring a 3 wire transmitter may seem complicated at first, but it is actually quite simple once you understand the basic wiring diagram. By following the steps outlined in this article, you can properly wire a 3 wire transmitter and ensure accurate and reliable measurements. If you have any questions or concerns, consult the manufacturer’s instructions or seek the advice of a qualified technician.
