How does Shenzhen EPT level switch optic work?

- Dec 27, 2019-

Working principle of electric-optic liquid level switch

The electric-optic liquid level switch is mainly composed of two main parts: an infrared LED and a phototransistor, which are accurately positioned at the bottom of the sensor tip. Its working principle is mainly based on the use of a electric-optic liquid level switch sensor containing an infrared light-emitting diode and a photoelectric receiver. The light from the LED is directed into a prism on top of the sensor. When the tip is in the air, infrared light is internally reflected around the tip of the phototransistor, providing a strong optical coupling between the two. When the sensor tip is immersed in the liquid, infrared light escapes from the tip, causing the amount of light from the phototransistor to decrease, which causes the output state to change. As shown below:

1-4

Advantages & disadvantages of electric-optic liquid level switch
The main advantages of electric-optic liquid level switches are small size, few parts and low cost. In high pressure environments, level detection is very accurate. But they cannot be used for continuous level measurement. In addition, the electric-optic liquid level switch is not suitable for the top-mounted environment, when the electric-optic liquid level switch is installed on the top, the precision photoelectric liquid level switch may be adversely affected by moisture condensation.


This is a brief introduction to the Shenzhen EPT electric-optic liquid level switch:


1. Shenzhen EPT stainless steel electric-optic liquid level sensor FS-IR1903D


Shenzhen EPT stainless steel electric-optic liquid level sensor FS-IR1903D is specially designed for high pressure water and liquid level sensing, and can measure with an accuracy of ± 1mm. The built-in optical electronics provide a voltage signl that senses the presence of liquids up to 100 ° C. This sensor is ideal for corrosion-resistant level sensing, pressure vessels, refrigeration and hydraulic applications.

image


Shenzhen EPT stainless steel electric-optic level sensor FS-IR1903D features:


1) The prism of PSU material is fixed on the stainless steel casing by glue to provide higher pressure resistance.
2) Excellent value for money.
3) Ideal for corrosive liquids.


Shenzhen EPT stainless steel photoelectric level sensor FS-IR1903D application:
Hydraulic oil and lubricant monitoring.
Critical level monitoring for industrial OEM applications such as machine tools, compressors, refrigerants.
Ideal for corrosive liquids: acids, solvents, electrolyzed water.


2. Shenzhen EPT plastic photoelectric liquid level sensor – FS-IR1902D


The Shenzhen EPTFS-IR1902D sensor is characterized by a polysulfone polymer housing and no moving parts. This plastic level switch is ideal for single-point level monitoring in medical diagnostic equipment, dialysis systems, sterilizers, and other OEM industrial and medical applications. Built-in optoelectronic components provide a voltage siganl that can detect the presence or absence of fluids at temperatures up to 100 ° C and pressures up to 4.5MPa.

image

Shenzhen EPT plastic photoelectric level sensor FS-IR1902D features:
1) Smallest size.
2) High precision.
3) Robust design for harsh environments.


Shenzhen EPT plastic photoelectric liquid level sensor FS-IR1902D application:
Coolant tank monitoring and warning
Medical diagnostics, sterilizers, lotions and dialysis equipment
Low level alarm for machine tools, generator sets, OHV lubricants
Low level alarm in hydraulic storage tank