차압 트랜스미터: 기능 및 애플리케이션

차압 트랜스미터는 파이프의 압력 차이를 감지하여 유량을 정확하게 측정하므로 신뢰할 수 있는 산업용 애플리케이션을 보장합니다.

### 차압 트랜스미터의 이해: 기능, 측정 및 애플리케이션
* 🔧 차압 트랜스미터는 다양한 산업 분야에서 압력 차이를 효과적으로 측정하기 위해 널리 사용되는 **단순한 디자인의 신뢰할 수 있는 장치**입니다.
* 📊 이러한 트랜스미터는 **차동 커패시턴스, 진동 와이어 또는 스트레인 게이지**와 같은 센서를 사용하여 다이어프램에 가해지는 압력을 전기 신호로 변환한 다음 판독 가능한 출력으로 처리합니다.
* ⚡ 일반적인 출력 신호는 **4-20밀리암페어, 0-5볼트 또는 0-10볼트**이며, 선형 관계에서 **4밀리암페어는 0psi**를 나타내고 **20밀리암페어는 측정 가능한 최대 압력(보통 100psi로 설정됨)**을 나타냅니다.
* 📏 압력 측정은 일반적으로 **bar와 psi**로 표시되며, **1bar는 해수면에서의 대기압**, psi는 **1평방인치에 1파운드의 힘**을 측정하는 단위입니다.
* 🌊 차압 트랜스미터는 파이프에 압력 강하를 생성하여 유량을 측정하며, **Delta-P 측정값을 사용하여 분당 갤런 또는 시간당 입방미터 단위로 유량을 계산**하며 특히 깨끗하고 점도가 낮은 유체에 효과적입니다.
* 🔍 이 장치는 압력 차이를 생성하는 **1차 요소와 이를 정확하게 측정하는 2차 요소**로 구성되며, 두 요소 모두 트랜스미터 내에 밀폐되어 있습니다.
* 📉 DP 트랜스미터는 안정적인 성능과 유지보수의 용이성을 제공하는 **상하수도 시스템의 유량 측정** 등 산업 환경에서 필수적인 도구로 활용됩니다.
* 📚 PLC 프로그래밍 및 기타 관련 주제에 대한 추가 학습을 원하시면 **realpars.com과 같은 리소스**를 통해 이 분야에 대한 이해와 경력을 향상시킬 수 있습니다.

With a simple and reliable design, a long history of use across a broad range of industries, the differential pressure transmitter is sure to be in use for many years to come. Want to learn PLC programming in an easy-to-understand format and take your career to the next level? Head on over to realpars.com.

and one of several ways to convert the pressure applied onto the diaphragms into an electrical signal. Sensors such as differential capacitance, vibrating wire, or strain gauges are used to produce the electrical signal that will be sent to the electronics housing, where it is processed, converted, and amplified into a current or voltage output that can be read by the control system. The current output is commonly a 4-20 milliamp signal, or in some cases a 0 to 5 or a 0 to 10 volt signal. The electrical output generated by the DP transmitter electronic module is linear and proportional to the actual measured Delta-P. Depending on the range of measured pressure, a 4 milliamp signal would equal a measured Delta-P of 0 psi, and a 20 milliamp signal would equal the maximum measurable value. In this case, we’ll say that the maximum Delta-P is 100 psi.

The most commonly used measurements of pressure in an industrial fluid and gas processing environment are bar and psi. One bar is the equivalent of the earth’s atmosphere at mean sea level. A pound per square inch is the force of one pound on an area of one square inch. You will most likely use these units of measurement in your work as they are commonly used, and almost every manufacturer of pressure measurement devices calibrates them to these units of measurement. Now that we know a little bit about pressure, let’s discuss how a differential pressure transmitter actually measures pressure and tells us what the pressure is. From now on in this lesson, we are going to use the terminology that is utilized in the industry when we talk about differential pressure transmitters. Delta-P or DP is the industry-standard term for the measured differential pressure. Delta, meaning “change in,” and P meaning pressure. In addition, most people will simply call a differential pressure sensor

is proportional to the square of the flow rate. The Delta-P is then converted into units of flow. These units of flow can be gallons per minute or cubic meters per hour. Using DP transmitters as a method to measure flow works best on fluids that are relatively clean and of low viscosity. Delta-P flow transmitter supports a small span or range, which is why they are very commonly used in water and wastewater applications. Now let’s go over what we have discussed. A differential pressure transmitter is an instrument that can consistently and accurately create a pressure drop in a pipe and then use the pressure measurement on either side to provide the rate of flow within the pipe. A differential pressure flow transmitter can be easily installed in many applications. Manufacturers today are providing a wide range of electronic outputs and protocols that are compatible with nearly any industrial control system on the market. They are an efficient tool for measuring flow, and used in the right application, will provide years of reliability and ease of maintenance.

a DP sensor or transmitter. From now on, we will refer to these devices as DP transmitters. A DP transmitter is a pressure-measuring gauge or an electrical device that uses two elements to measure the differences of pressure in a sealed container such as a pipe. DP transmitters will have a primary element, a secondary element, and an electronics housing. The primary element will produce a difference in pressure as the flow in the pipe increases. Different types of primary elements include orifice plates, venturi tubes, pitot tubes, flow nozzles, laminar flow elements, and wedge elements. The secondary element will measure the difference of pressure produced by the primary element as accurately as possible. The primary element is sometimes called the high side, and the secondary element is called the low side. It is important to remember that the high side and low side aren’t always on the respective high and low-pressure sides of the pipe. The elements in a DP transmitter will have sealed diaphragms.

In this lesson, we are going to discuss differential pressure transmitters. Simply put, a differential pressure transmitter is a device that measures two opposing pressures in a pipe or vessel. At RealPars, we love helping you learn, so if you enjoy this video as much as we enjoyed making it, click the like button, subscribe, and click the bell, and you’ll receive notifications of new RealPars videos, so you’ll never miss another one! To understand how a differential pressure transmitter works, we need to know some principles of pressure. The pressure is the result of force applied onto a unit of area. In the case of fluid and gas, this area would be the inside of a pipe, tank, vessel, or other sealed housing. Since pressure is a physical quantity, it can be measured. The pressure is measured in one of the following five units: Pascal, bar, standard atmosphere or atm, torr, and pounds per square inch or psi.

Using these variables, we would know that a 12 milliamp signal would equal 50 psi Delta-P. The relationship of the produced electrical signal to the units of measure is called the scaled output. So, now that we know what pressure is and how a DP transmitter works, what is it used for? Well, the most common applications are for measuring level and flow. Here we’ll discuss how a DP transmitter measures the flow of water in a pipe. One very common way of measuring flow using a DP transmitter is for the primary element to introduce a constriction in the pipe. Using a restrictive element on the primary side will create a high and low pressure. When the flow increases, more pressure drop is created. As we remember, the secondary element will measure the difference in pressure created by the primary element. These measurements are sent to the electronics housing where the signal processing is done. By using Bernoulli’s equation, which states that the pressure drop across the constriction

Differential Pressure Transmitter Explained

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Bar와 psi는 산업용 유체 및 가스 처리에서 일반적으로 사용되는 압력 측정 단위입니다.

Delta-P 또는 DP는 측정된 차압을 유량 단위로 변환하는 업계 표준 용어입니다.

차압 트랜스미터는 깨끗하고 점도가 낮은 유체의 유량을 측정하는 데 효과적이며 산업용 제어 시스템과의 호환성을 위해 다양한 전자 출력을 제공합니다.

DP 트랜스미터는 1차 요소와 2차 요소를 사용하여 밀폐된 용기의 압력 차이를 측정합니다.

1차 요소는 유량이 증가함에 따라 압력 차이를 발생시키고, 2차 요소는 이러한 차이를 측정합니다.

차압 트랜스미터는 파이프나 용기의 반대쪽 압력을 측정하는 데 필수적이며, 압력은 파스칼, 바, psi 등 다양한 단위로 측정할 수 있습니다.

유량 측정에서 DP 트랜스미터의 기능

DP 트랜스미터는 12밀리암페어 신호를 사용하여 50psi Delta-P를 측정하여 압력 측정을 위한 스케일 출력을 설정합니다.

일반적으로 레벨과 유량을 측정하는 데 사용되며, 파이프의 수축으로 인해 고압과 저압이 생성됩니다.

보조 요소는 압력 차이를 측정하고 측정값은 베르누이 방정식을 사용하여 유량을 결정하기 위해 처리됩니다.

차압 트랜스미터의 기능 및 영향

차압 트랜스미터는 단순한 디자인으로 다양한 산업 분야에서 오랫동안 사용되어 왔습니다.

차동 커패시턴스, 진동 와이어 또는 스트레인 게이지와 같은 센서를 사용하여 다이어프램에 가해지는 압력을 전기 신호로 변환합니다.

결과 전기 출력은 선형적이고 측정된 Delta-P에 비례하며, 일반적인 범위는 4~20밀리암페어 또는 0~10볼트 신호입니다.