Pressure Transmitter

Pressure sensors are among the most widely used devices in industrial applications. They are essential for automation and monitoring across industries such as hydropower, transportation, aerospace, military, petrochemicals, oil fields, power generation, and building automation. This article introduces the working principles of four common types of pressure sensors. 1. Piezoresistive Pressure Sensors Working Principle: Piezoresistive […]

1. Preparation Ensure that both high-pressure and low-pressure isolation valves are closed. Confirm that the equalizing valve is in the open position. 2. Line Flushing Open the drain valve. Slowly open the primary process valve to flush the impulse lines. Perform flushing at least twice. Close the drain valve after flushing. 3. Cooling and Air

📌 Background In a 200,000-ton/year Linear Alkylbenzene (LAB) production unit, pressure transmitters located at the fractionation tower outlet were frequently failing due to severe corrosion. The process medium contained high-temperature, moist hydrofluoric acid (HF), which quickly attacked the Monel diaphragm of the pressure transmitters. On average, the transmitters lasted only 2–3 days before showing drifting

The diaphragm of a pressure transmitter plays a crucial role in determining measurement accuracy, long-term stability, and the overall reliability of the device. Choosing the correct diaphragm material and structure is essential to ensure optimal performance and durability, especially in demanding industrial environments. 1. Understand the Properties of the Measured Medium The first step in

In industrial operations, it’s common for engineers and inspectors to ask:“Must every pressure gauge have a red line indicating the maximum working pressure?”And if a gauge lacks this red mark, does it represent a safety hazard? Let’s explore this question from three critical perspectives: the purpose of the red mark, relevant regulatory requirements, and practical

Paper, one of the Four Great Inventions of ancient China, remains a cornerstone of modern civilization. Today, the pulp and paper industry is not only essential to national economic development but also critical to environmental and societal progress. Among the many technologies supporting this industry, pressure sensors play a vital role across various stages—from raw

Hydropower generation harnesses the potential energy of elevated water sources—such as rivers, lakes, or reservoirs—and converts it into mechanical energy via a water turbine, which in turn drives a generator to produce electricity. As a renewable and environmentally friendly energy source, hydropower plays a vital role in the global energy mix. Pressure sensors are essential

1. Overview Bar-type flow meters, also known as insertion differential pressure flow meters, operate based on Bernoulli’s principle. By measuring the differential pressure generated across the sensor (total pressure minus static pressure), they calculate flow velocity and volume. Their simple structure, low pressure loss, and ease of installation make them ideal for large-diameter pipelines (typically

1. Differences in Application Requirements Pressure transmitters—especially differential pressure transmitters—often require range adjustments based on specific field conditions. For example, when used for level measurement in sealed tanks, condensation of the gas-phase medium can cause condensate to accumulate in the impulse lines or low-pressure chambers. This creates an unintended static pressure, resulting in output deviation.

Pressure transmitter accuracy is a key indicator of measurement reliability. However, the belief that “higher accuracy is always better” is not universally applicable. In industrial practice, the selection of a pressure transmitter should be based on actual application requirements, rather than pursuing the highest specification available. 1. Understanding Accuracy in Pressure Transmitters Accuracy defines how