What is a liquid level transmitter? What is the difference with liquid level sensors?

The transmitter consists of a measurement section, an amplifier, and a feedback section, and is implemented based on sensors. Due to the measurement part of the transmitter, it can fall within the scope of the testing instrument. To enhance your understanding of transmitters, this article will introduce the differences between liquid level transmitters and water level sensors. If you are interested in the upcoming content of this article, please continue reading.

What is a liquid level transmitter? Liquid level transmitter is a common liquid level measuring instrument that is based on the principle that liquid static pressure is proportional to liquid height. According to the linear correlation principle of liquid pressure in different proportions, it can accurately measure and transmit water, oil, paste volume, liquid height, and weight, and is widely used in multiple fields. Liquid level transmitters are widely used for liquid level measurement and control in rivers, groundwater, reservoirs, water towers, and containers. It is a sensor that converts liquid pressure into liquid level by measuring it. The principle is that the measured static pressure of the liquid is proportional to the height of the liquid. Liquid level transmitters can be divided into two types: whether to have a representation and whether to require remote transmission. The sensor core generally adopts diffusion silicon piezoresistive, ceramic capacitor or sapphire, which has the characteristics of high detection accuracy, simple structure, and good stability.

Differences between liquid level sensors and water level sensors

1. The water level sensor emphasizes liquid level signal detection. For example, the float in a float level transmitter is referred to as a "water level sensor". Its function is to use the upper and lower spacing of the float to represent the liquid level.

2. Level transmitter, pay attention to "change" and "send". For example, when a floating ball moves up and down with the liquid level, a regional electrical signal is generated in the metal tube, and this process is called "change". This electrical signal is usually of non compliant size and cannot even be used in future circuits. Therefore, a circuit is installed around the pipeline to convert this irregular electrical signal into standard electrical signals (such as 4-20MA, 0-10V, etc.), It can be exported to other instruments or devices for display or control. This device is called a "liquid level transmitter".

Selection of liquid level transmitter type

As a digital display instrument for liquid level measurement, liquid level transmitters have been widely used in engineering applications due to their simple installation, high detection accuracy, and durability. Liquid level transmitters are widely used in input type liquid level transmitters, single flange liquid level transmitters, double flange liquid level transmitters, RF capacitor liquid level transmitters, etc.

Single flange liquid level transmitter

A single flange liquid level transmitter includes a flat flange and a liquid level transmitter with an inserted barrel flange, which measures the liquid level height using the gravity of the measuring medium itself. Single flange liquid level transmitters are suitable for substances with high viscosity and easy crystallization, and are generally used for installing open containers or equipment.

Double flange liquid level transmitter

A double flange liquid level transmitter is a differential pressure transmitter that provides a reliable measurement method to prevent the substance to be measured from directly contacting the isolation membrane of the transmitter. The key feature is to isolate high-temperature materials from the transmitter, and the measuring materials are sensitive to the transmitter. The original corrosive, floating liquid or high viscosity medium, and the material to be tested will dry or crystallize due to changes in environment or step temperature. Replacing the material to be tested must be strictly purified and measured. The double flange liquid level transmitter is mainly used to measure the liquid level of sealed pressure vessels.

Input type liquid level transmitter

The input type liquid level transmitter has both rod and belt types. The principle is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid, and the resistance effect of diffusion silicon or ceramic sensitive components is selected to convert the negative pressure into an electrical signal. Convert temperature compensation and linear calibration into 4-20mADC standard current signal export. Due to the simple installation, simplicity, and strong adaptability of the transmitter, it can directly and accurately measure viscosity from water and oil to viscosity. It is generally used for installing open containers or equipment, and is not affected by bubbles and accumulation of the measured substance.

RF capacitive liquid level transmitter

The principle of radio frequency capacitive liquid level transmitter is that when the probe and conductive liquid form a capacitor, the metal core of the probe wire is one pole of the capacitor, the conductive liquid is the other pole of the capacitor, and high stability polytetrafluoroethylene is in the middle, that is, the insulation surface of the probe wire serves as the material between the two poles. As the liquid level changes, the liquid area around the probe line changes, resulting in a change in the relative area between the two poles of the capacitor. The RF circuit that converts this change into an analog signal output. The RF capacitive liquid level transmitter is as simple as measuring normal temperature and pressure, and the measured value is not affected by the temperature, proportion, container shape, and pressure of the liquid to be measured. The RF capacitive liquid level transmitter is as simple as measuring normal temperature and pressure, and the measured value is not affected by the temperature, proportion, container shape, and pressure of the measured liquid. Mainly used for liquid level measurement of acids, alkalis, fluorides, organic solutions, liquid carbon dioxide, ammonia, polyvinyl chloride powder, ash, oil-water interface, traditional Chinese medicine, etc.

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