Sensor is the name of the sensor. So what is a sensor? Sensor is a device used to monitor temperature; Pressure; acid level; water level monitoring; wastewater level; CO2; PH… In all factories. And now the use of sensors is gradually replacing people to save business costs. At the same time, providing high accuracy and stability

What is a sensor

With the current era of Technology 4.0; In about 2-3 years, all devices will replace humans almost completely. Instead of many people working, now only 1 person can monitor and know all that is happening in the factory line to promptly develop and overcome solutions.

What are sensors?

Today; I will summarize some details about the types of level sensors in industry and the best methods of liquid level measurement today.

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So there are several types of sensors used in industry. How does the sensor work in each case? Please read more

The best sensors today

The current; temperature monitoring problems; humidity monitoring; pH or liquid level is always a matter of high concern in factories

Common application sensor types are:

Temperature sensor (Temperature sensor)

Ultrasonic liquid level sensor

Sensor radar equipment to measure cement level; fuel level

Pressure sensor

PH sensor; moisture meters; CO2….

These are temperature sensing devices; Pressure Gauge; measure water level by ultrasonic level measurement method; radar; capacitance…In which the method of monitoring liquid level by radar is the most accurate method in the line of level sensors; liquid level sensor with an allowable error of 2mm

Especially the issue of temperature or humidity. Most in all factories have

Principle and application of temperature sensor

Temperature sensor (Temperature sensor) with the main function is to plug the device into the area with the temperature to be measured so that it continuously reports the temperature signal. The main purpose for the user to know if the temperature is at an allowable level or is increasing or decreasing

Principle of temperature sensor

There are many types of temperature sensors. Temperature sensors such as the 3-wire pt100 Temperature Sensor; Types of Thermocouple K; S; R….is stratified into 2 main lines, which are onion temperature probes and wire thermocouples

The principle of operation of the temperature sensor is to receive heat and transmit resistance signals for the 2-wire temperature sensor lines; 3 wires; 4 wires. And transmit mV signal for different types of sensors; can s….

If we pay attention, we will see the measuring sensor rod has 2 different colors. The bottom of the stick is darker in color than the top. This is the built-in platinum layer for thermal measurement. The heat is then transferred along the tube out in the form of resistance or mV. Usually, a unit that needs high accuracy should add a resistor or mV converter to DC 4-20mA current.

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Operating principle and application of pressure sensor

Pressure sensor (pressure sensor) it is an application device to measure the pressure on the pipeline to control the shut-off valve to ensure that the pressure is not too low or too high to cause the water pipe to explode. Besides that; The pressure sensor is also used to measure the water level (1 bar = 10 meters of water).

Working principle of pressure sensor

There are two types of pressure sensors: negative pressure sensors and commonly used positive pressure sensors. The negative pressure sensor always starts from -1. For example: -1…0 bar; -1…3 bar… This is considered a suction sensor; the second type is the commonly used positive sensor: 0-250 mbar; 0-4 bars; 0-10 bars….

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The working principle of the pressure sensor is when the liquid solution is like water; acid; chemistry; gas; oil… flows across the installation of the pressure gauge, creating a push into the ceramic membrane of the sensor. Immediately, the membrane will bend according to the push to touch the built-in converter center in the device to generate a current of 4-20mA/ 0-20mA or a voltage of 0-5v / 0-10v….

Operation principle and application of humidity sensor – Temperature

Humidity sensor (Hygrometer sensor) is used to monitor the humidity in the area to be measured. To ensure that the area humidity meets the requirements set forth. In case of lack of moisture, it must be increased, or if there is excess moisture, there must be a solution to reduce it. Or temperature monitoring of fruit areas; contain alcohol; food storage area……To ensure the correct temperature is maintained

Principle of sensing due to humidity and temperature

The temperature sensor – Humidity works on the principle of a hygrometer that senses humidity or temperature in a humid area, converting the sensed heat or humidity signals into 4-20mA currents or voltages. 0-10v. Usually in the field of measuring humidity and temperature in humid areas, the measuring range is not high.


Use temperature sensor – Humidity to maintain the right temperature and humidity to help plants grow well in the greenhouse. According to the method of growing clean vegetables.

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Or monitor the fruit temperature in a cold room to make sure The right temperature to avoid fruit spoilage….

Working principle and application of liquid level sensor

Liquid level sensor (Liquid level sensor) is a type of liquid level indicator that continuously outputs analog current or voltage to the inverter / Connects to PLC or modbus rtu and transmits to computer monitoring.

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There are many types of liquid flow measurement for continuous measurement, such as float level sensors; capacitive level sensor; level measuring radar device or ultrasonic level sensor

Application principle of float level sensor

Principle of float level sensor

Float sensor is designed with 2 types of heat-resistant plastic and stainless steel. Used to measure water level; sewage, acid; chemistry; and is widely used in factories because of its low value. However; This is a device used to report liquid levels in the past when ultrasonic radar devices were not developed

The operating principle of the float sensor (water level indicator) is very simple. Where the liquid rises, the float rises to it. The purpose of using floats is to report that the water is dry and the report is full of water

Principles and applications of capacitive sensors

The electric sensor used is a type of direct measurement liquid level device. That is, the device is in direct contact with the liquid. Depending on the type of liquid, the device is designed with a 304 stainless steel measuring rod; 316L or add plastic wrap around the stainless steel rod or apply a layer of PTFE around the connection thread for highly corrosive liquid measurement environments. The length and length of the measuring stick or the horizontal or vertical mounting method both depends on the depth and width of the tank or tank / Tank

Principle of electrode level sensor

For liquids that need to be measured continuously, the capacitive level sensor works on the principle that when the liquid rises, the device will report the level to measure and convert the measuring distance of the measured liquid level into 4-line. 20mA connected to the display reads 4-20mA signal for liters or liquid level height


Measuring range 0-1000mm, the measuring sensor outputs a signal equivalent to 0-20mA

Principle and application of ultrasonic sensors

Ultrasonic distance sensor is considered as one of the non-contact level measuring devices with very high durability and accuracy. Its accuracy is second only to radar level sensor

The radar level sensor works on the principle of emitting a wave beam down the liquid surface and reflecting the wave back when it touches the liquid, then calculates and converts to the liquid level height distance.

Ultrasonic sensor for continuous liquid level measurement

The ultrasonic sensor is designed to create a 10 oC beam angle. Therefore, the installation and calculation must be reasonable to avoid the case of waves hitting the wall of the tank or creating false alarms. The larger the melt depth or the reservoir, the larger the angle of the wave

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The dinel liquid level sensor has a special feature that is the ability to continuously measure 4-20mA current; And there is also a model line of sensor devices that emit on/off signals

Application principle of radar ultrasonic level measuring device

Radar level sensor devices are the most popular sensor series in all measurement environments. This is the measuring device with the highest accuracy up to 2mm. This is the standard error required on each measuring device. However; With a level of 2mm – 3mm, it is considered the most accurate European level sensor device today

Radar sensor for measuring liquid or solid level works on the principle of transmitting wave forming a ring around the sensor’s rod or stainless steel wire, and wherever the liquid or solid level rises, the converter converts and reports the signal continuously. signal to get there

Principle of the sensor to measure the pressure difference in the stairs

Gas pressure differential sensor

Stair differential pressure sensor is a device widely used in high-rise buildings with the main purpose of checking the pressure difference between stairs and corridor stairs. These stair differential pressure measurement devices are used to control ventilation fans to suck CO2 gases in the event of a fire incident in the building.

Principle of boiler differential pressure sensor

Usually in boilers people use capacitive sensors to measure the high temperature boiler liquid level. However; In many cases, the temperature in the boiler is too high, leading to the continuous line of boiler level measuring equipment with substandard electrodes, it is imperative that we use a boiler differential pressure sensor to compensate for this shortcoming.

Principle of boiler differential pressure sensor

The boiler differential pressure sensor has the same principle as the differential pressure gauge. That is, it measures the difference in water pressure between 2 points A and B and then converts it to a 4-20mA current signal and connects to the water level display screen to give the actual current water level height in the boiler.

Disadvantages of boiler differential pressure sensor

The disadvantage of boiler differential pressure measurement line is that it is much more expensive than capacitive devices. The advantage of the differential pressure sensor is its very high accuracy. High temperature resistant and very durable

Hopefully, through the sharing article, readers will have an overview of what a sensor is? What is the working mechanism of the sensor? and Fully master the synthesis of most sensors in the industry You can refer to the actual types of level sensor devices at: Dinel level sensor