Tag: pressure transducer

A pressure sensor is a device equipped with a pressure-sensitive element that measures the pressure of a gas or a liquid against a diaphragm made of stainless steel, silicon, etc. When using a pressure sensor, there will inevitably be some problems, such as noise. What are the reasons for the noise? It may be caused by the discontinuity of the internal conductive particles, or the shot noise generated by the semiconductor device, etc. Some other reasons will be introduced in detail below.

A pressure sensor is a device or instrument which is able to measure the pressure in gases or liquids. A pressure sensor consists of a pressure-sensitive element which can determine the pressure being applied and components to convert the information into an output signal. Before using pressure sensors for measurement work, we need to perform detailed calibration work on them, because if we do not calibrate them before use, various faults or inaccurate measurement results may occur during the measurement process.

Pressure sensors are one of the most commonly used sensors in industrial practice and are widely used in a variety of industrial automation environments and many other industries. When purchasing a pressure sensor, the stability of the product is a major consideration. What are the factors that affect the stability of pressure sensors? Next, we will detail the factors that affect the stability of pressure sensors.

As with all continuous output pressure sensors, regardless of the application, the most sensitive component to the sensing diaphragm and most critical to the function of the pressure sensor is the sensing diaphragm. If it doesn't work, your readings will be incorrect, or in extreme cases, you will have no readings at all. 

Pressure sensor is a device that converts non-electricity into electrical signals. In modern industrial equipment, pressure sensors are an indispensable part of the reason. It can also be seen from the two aspects. Traditional industrial equipment, such as in its The necessary sensors are added to the device and equipped with precision measuring components, its function and accuracy can be improved; industrial equipment is used as the control object of the automation system or as the automation system. A part of the system must be compatible with the three parts of the automation system (detection, control, and execution) or provide interfaces to integrate them into an organic whole. To sum up, adding sensors as industrial equipment itself is a necessary condition for the replacement of traditional equipment displacement sensors.

For most engineering applications, choosing a suitable pressure sensor will have an important impact on the accuracy of the entire engineering measurement and the progress of the project. There are many types of pressure sensors available today. How to select a pressure sensor reasonably according to the specific measurement purpose, measurement object and measurement environment is the first problem to be solved when measuring a certain quantity.

Pressure sensor is a device that senses a pressure signal and converts the pressure signal into a usable output electrical signal. Under the interference of external factors, the output of the sensor usually has unneeded changes that have nothing to do with the input. This type of change is called "temperature drift", and the main reason for drift is that the sensitive components of the measurement system are usually easily interfered by external temperature, humidity, electromagnetic interference and sensor conditioning circuits.

Devices that can measure pressure and provide remote electrical signals are collectively referred to as pressure sensors. The pressure sensor is an important part of the pressure detection instrument, and its structure is varied, the common types are strain type, piezoresistive type, capacitive type, piezoelectric type, vibration frequency pressure sensor and so on. In addition, there are photoelectric, optical fiber, ultrasonic pressure sensors and so on. The pressure sensor can directly convert the measured pressure into various forms of electrical signals, which is convenient to meet the requirements of centralized detection and control of the automation system, so it is widely used in industrial production.

The electrical measuring instrument in the pressure measuring instrument is usually called a pressure transducer (pressuretransducer). It is a sensor that converts the pressure signal into a voltage signal output. Usually the pressure sensor is generally composed of elastic sensing element and displacement sensing element. The function of the elastic sensing element is to make the measured pressure act on a certain area and convert it into displacement or strain, and then the displacement sensing element or strain gauge converts it into an electrical signal that has a certain relationship with the pressure. Sometimes the functions of these two elements are combined. 

A pressure sensor is normally used to determine the value of the pressure generated in a system. The main intention is to compare to expected values for expected safe operation of the system in question.

Common systems where pressure sensors are used include but are not limited to:

• Compressed air systems.
• Lubricant oil systems.
• Water pumping systems.

The systems mentioned above can actually be found in different industries and there are other systems which require pressure sensors. So, let’s see how pressure sensors can be used in each.

In normal inspection and maintenance of pressure transducer, zero calibration and periodical blowdown of the pressure transducer would involve the starting and stopping operations. So correctly start and stop the pressure transducer is also one of the required skills. This paper describes the specific start and stop operating steps of pressure transducer.

When we get a pressure transducer, it's necessary to do detection for it. The easiest way to test a pressure transducer is to connect it to a display instrument directly. And check whether the display value changes with the pressure. If it is ok. We have to do further detection for the pressure transducer.

Generally, DCS system treats the current higher than 20.2mA or less than 3.8mA as a fault, and the pressure transducer also has fault current settings. For example, it can set the fault current of pressure transducer to 3.6mA or 22.8mA, or setting as needed and related to failure alarm setting. When the output current of pressure transducer is less than 4mA or greater than 20mA, it refers to the common saying that the instrument display is below zero or the instrument display is maximum. In this case, the fault is analyzed and judged in excess of the range. When checking the over-range fault of pressure transducer, firstly check the components related to the process, whether the process parameters have significantly changed, whether the instrument sampling valve and connecting pipes are normal, whether the connecting line or safety grille is faulty or damaged. Then check the pressure transducer itself, whether its range is selected correctly, whether the measuring diaphragm and circuit board break.