Wired Level Switch

A wired level switch is a switching element used to control liquid level, typically containing a float and connected to the system by a cable. It is a very common and practical solution in industry.

How does it work?

A wired level switch contains a weight or ball mechanism . The logic is quite simple:

• As the liquid level rises, the float rises.
• When it reaches a certain angle, the switch inside changes contact (NO/NC).
• This signal is transmitted to the pump, alarm system, or automation system.

Wired Level Switch Key Features

• Easy installation (just dropped into the tank)
• No external power required (mechanical contact)
• NO / NC contact options
• Different cable lengths
• Suitable models for water, wastewater, and chemical liquids.

Where are wired level switches used?

• Water tanks
• Wastewater and sewerage systems
• Submersible pump control
• Industrial tanks
• Agricultural irrigation systems

Wired Level Switch Connection Diagram

Typically, a 3-core cable is used:

• Common (COM)
• Normally Open (NO)
• Normally Closed (NC)

Depending on the need:

• Turn off the pump when the tank is full.
• Start the pump when the tank is empty.

The connection is made in this way.

Advantages of Wired Level Switches

• Economical and durable
• Low failure rate.
• Easy installation
• Can work in challenging environments.

 Disadvantages of Wired Level Switches

• It doesn't provide very precise measurements (it only detects level).
• False triggering can occur in turbulent fluids.
• The cable length must be chosen correctly.