Optoelectronic level switch selection techniques

When GDY-series photoelectric liquid level switch (also known as: photoelectric liquid level controller) is selected, the following points need to be noted:

Power supply

Mainly 220VAC, 24VAC/VDC, 12VDC, 5VDC or 9~25VDC wide range of power supply are available for selection.

2. Output form

Dry contact output, transistor output (split into NPN output and PNP output), TTL or COMS output, etc.; among them, optional TTL output, COMS output, transistor output, level output, and dry contact output at 5VDC power supply; 12VDC power supply Optional COMS output, transistor output, level output and dry contact output; 24VDC power supply optional transistor output, level output and dry contact output; 220VAC power supply is mainly dry contact output.



3. Measuring medium

Divided into organic solvents (benzene, ketones, ethers, etc.), inorganic solutions (acids, alkalis, salt solutions, water, etc.), oil products (gasoline, frozen oil, lubricating oils, thermal oils, transformer oils, etc.), etc. Among them, organic and inorganic liquids and food, medicine, and cosmetics industries mainly use stainless steel prism heads for the simple reason that the 316L stainless steel welding optical glass prism head will not rust, and the photoelectric level switch and the measured medium are not Will affect each other; Oil liquid can choose carbon steel nickel plated optical prism head.



4. Influence of pressure on mechanical equipment, containers and pipelines, etc.

At present, as long as the metal welding glass prism head is selected, pressure resistance and leakage are not a problem. When the pressure reaches 25Mpa or more, separate instructions are required.

5. Temperature effect

Split-type photoelectric liquid level switch, the general use of temperature (-40 ~ 65 °C) most of the photoelectric level switch can be used; ultra-high or ultra-low temperature range should be selected temperature type photoelectric level switch.



6. Installation form

At present, the main thread installation, commonly used M20 * 1.5 mounting thread, 1/2NPT mounting thread, G1/2 mounting thread, etc.; small size of the M12 * 1 mounting thread, 1/4NPT mounting thread and M16 * 1.5 mounting thread , G3/8 mounting threads and extensions, etc. to allow the probe to come into contact with liquids.



7. Explosion protection requirements

For use in dangerous situations, Wan Shunhua Science and Technology GDY-Ex intrinsically safe explosion-proof photoelectric level switch should be used;

8. Contact and non-contact

The non-contact type is mainly used for the detection of the presence of liquid in transparent pipes and pipelines and can be directly snapped onto the outer diameter of the pipe.

9. Photoelectric liquid immersion transmitter

Mainly used for non-conductive liquid leakage monitoring and alarm, such as leakage monitoring of transformer oil.

If the above-mentioned commonly used specifications of the photoelectric level switch still cannot meet the requirements, you can contact Wanshunhua to customize it.

In addition, railways, ships, aircraft and other applications must meet specific industry requirements; petrochemicals, especially refining (train crane loading system) should use GXY-series optical fiber level sensor (optical fiber spill sensor).