Continuous level sensors measure liquid or dry material levels within a specified range and provide outputs which continuously indicate the level. They are more sophisticated devices than point level sensors because they measure over a range of levels instead of at one point to let the user know the exact amount of a substance. This produces an analog output that directly correlates to the fluid level in the container.

 

 

Level switches are typically point level switches, measuring whether the level of a container has reached or gone over a predetermined point. However, switching mechanisms can be integral to continuous level switches as well. Multiple point switches can be integrated together to give a stepped version of continuous level.

 

Switch Type

Electromechanical switch- Electromechanical switches have mechanical contacts or relays. These types of switches can control a wider range of current and voltage options. They are not affected by dirt, mist, magnetic fields or temperature ranges from near absolute zero to 1000°). Electromechanical switches can adapt to misalignment in installation/application to ensure there is no leakage current and making it available in many circuitry, actuator, and housing styles. Disadvantages include their price, limited contact life cycle, large and switch slowly. 

 

Solid-state switch - Solid- state switches are electric devices that do not have moving parts to wear out. They are able to switch faster without sparking between contacts or problems with contact corrosion. Their disadvantages include a high cost to build in very high current ratings.

 

Measurement Technology

There are several technologies available that can measure the level of media in a system. A full description and application of each technology is available in the Level Sensor Specification Guide.

 

Pole/Throw

The typical options for poles and throws are available. Most switches have one or two poles and one or two throws, but some manufacturers will produce custom level switches for special applications. The number of poles describes the number of separate circuits which can pass through the switch at the same time. The number of throws describes the number of circuits each pole can control. This is noted by the configuration of the circuit (NO/NC). Breaks are interruptions to the circuit caused by the separated contacts the switch introduces into each circuits it opens, or interrupts in the circuit.

 

Single Pole, Single Throw (SPST) - Single pole, single throw (SPST) switches make or break the connection of a single conductor in a single branch circuit. They usually have two terminals and are referred to as single-pole switches.

 

Single Pole, Double Throw (SPDT) - Single pole, double throw (SPDT) switches make or break the connection of a single conductor with either of two other single conductors. They usually have three terminals and are commonly used in pairs. SPDT switches are sometimes called three-way switches.

 

Double Pole, Single Throw (DPST) - Double pole, single throw (DPST) switches make or break the connection of two circuit conductors in a single branch circuit. They typically have four terminals.

 

Double Pole, Double Throw (DPDT) - Double pole, double throw (DPDT) switches make or break the connection of two conductors to two separate circuits. They typically have six terminals and are available in both momentary and maintained contact versions.

 

Other- Other, special throw types with more than two poles. Examples include switches that are designed to split loads into separate circuits (e.g., headlamp switch).

จำหน่าย SAFETY LIGHT CURTAIN - OPTIMUS CONTROL CO., LTD. ตัวแทนจำหน่าย 

 

Malaysia Singapore ประเทศไทย  Thailand Indonesia Philippines Vietnam Europe USA

 

We deliver wolrd wide.

ประเทศไทย  จำหน่ายเซนเซอร์สำหรับงานอัตโนมัติต่างๆ คุณภาพสูงตามมาตรฐาน CE ในราคาประหยัด เพื่อลูกค้ากลุ่มอุตสาหกรรมในประเทศไทย เราพร้อมยินดีให้คำปรึกษาการเลือกใช้งานต่างๆ เสนอราคา พร้อมเทียบรุ่นต่างๆ