A differential pressure gauge measures the difference in pressure between two points in a system and presents the subsequent differential pressure directly on a single gauge dial. Ashcroft has specialized in pressure instrumentation since 1852. As a leader in our field, we are often asked to provide information to individuals looking for a foundation of knowledge on this subject and more. Read on to learn where basic definitions related to differential pressure, where the gauges are used, how they work, and common applications. When you're done reading, you will also find additional resources that may interest you.

This article was originally published on December 13, 2021, and was updated on February 4, 2024. Different industrial applications require different types of gauges to measure pressure at various points of the process. Mechanical pressure gauges, for example, can be used to measure absolute pressure, vacuum pressure and compound pressure. If you’re not selecting the appropriate kind of pressure to be measured, your gauge may not provide you with the required “readable” pressure scale. Ashcroft has been manufacturing pressure and temperature instrumentation since 1852 and as the senior product manager for process gauges, I have been fielding questions on the subject for the past 15 years. In this article, I will take you through the various types of pressure and review the different gauges and transducers available to meet your specific pressure needs.

A pressure gauge is a mechanical instrument that is used to measure and monitor the pressure of air, gases or fluids in process, commercial and industrial systems. These devices operate using the system’s process, meaning they will give you a reading even when you have no power source. But to really understand pressure gauges and how they work, you need to start with the basics. Ashcroft has been making these instruments since 1852 and we wrote this article to give you a foundation of information that you can use as a reference. Read on to learn about the different types of pressure gauges (process, commercial, industrial, digital) and their functional components. Also become knowledgeable of gauge operating principles and construction, manufacturing standards, sensing and scale elements for various applications, dial options, and more. When you are done reading, you will also find additional resources that may interest you.

The number of industries that rely on pressure measurement equipment is expansive. The list includes manufacturing, water/wastewater, hydraulics, food and beverage, medical, and pharmaceutical, among others. If you are new to any of these markets, you need to understand the importance of monitoring and maintaining appropriate levels of pressure in the critical processes in your industry. In fact, accurate measurement of pressure in these processes is essential for ensuring safety, control and process efficiency. However, achieving these goals requires periodic instrument calibration. With more than 12 years of specialization in precision instruments, I have witnessed first-hand the consequences of neglecting calibration. As a follow-up to my blog titled, How to Check the Calibration of a Pressure Gauge, this article examines in more detail the circumstances that necessitate this important process, focuses on the three most critical factors of calibration and discusses the considerations associated with each factor. When you finish reading, you will have a solid foundation of knowledge regarding pressure instrument calibration and be ready to dig deeper into the topic with the additional resources provided for your reference.

If you work with any of the critical mechanical applications found in the modern world - including mobile construction equipment, and fuel pumps for example - it is likely you also manage hydraulic systems. Because these systems use liquids in various forms to generate power, you know that the inherent pressure feature of hydraulics has to be managed properly. In the best-case scenario, a lack of sufficient management of pressure levels in a system could lead to inferior output. In the worst cases, it could cause damage to equipment or physical harm to system operators. Hydraulic pressure gauges play a critical role in regulating pressure by monitoring levels in either a specified part or the entire system to ensure things are operating normally. So how do you know which pressure gauge will work best in your hydraulic system? Just know what you’re looking for and choose carefully! Sounds simple, right? As a pressure gauge product lead at Ashcroft - a recognized authority in temperature and pressure solutions - I have seen many scenarios where the wrong pressure gauges were selected and the impact that decision had on operations. In this article, you will learn about the five pressure gauge features I consider most important for hydraulic applications so you can be confident about selecting the best option to meet your specific needs. Let’s get started.

When you’re monitoring differential pressure in applications where high static pressure and low differential pressure is a requirement, reliability and corrosion resistance is essential for instrumentation to operate safely. If your pressure measuring instruments aren’t compatible with your process, you may face equipment damage and downtime. This blog will compare Ashcroft’s 5503 and F5504 differential pressure gauges and discuss their features and benefits to help you find the best solution for your needs.