INDUSTRIAL MANUFACTURING BLOG YOU SHOULD BE READING

The Ultimate Guide to Choosing Industrial Pressure Measurement Devices

03, Mar. 2025

Ultimate Guide to Pressure Gauges: Types, Applications, and More

In a world where precision and safety are non-negotiable, the tools you depend on matter more than ever. One such tool is the pressure gauge ' often small but huge in impact. Whether you're managing industrial systems, testing equipment, or ensuring things run smoothly, having the right pressure gauge can make all the difference.

If you want to learn more, please visit our website.

In this blog, we'll explore what makes pressure gauges essential across various industries. We'll break down the different types of pressure gauges available today'from mechanical to digital'and highlight their unique features and applications.

What Is Pressure Gauges?

A pressure gauge is a device used to measure the pressure of a gas or liquid within a system. It provides a visual reading of the pressure level, which is essential for monitoring and maintaining equipment performance, providing safety, and preventing damage due to overpressure or underpressure conditions. Pressure gauges are commonly used in a wide range of industries, from manufacturing and HVAC systems to automotive, laboratory research, and even household appliances.

There are various types of pressure gauges, including mechanical (analogue) and digital models, each with unique features suited to different applications. Mechanical gauges often feature a dial with a needle that moves according to the pressure, while digital gauges display pressure readings electronically. Regardless of the type, pressure gauges help operators maintain optimal pressure levels in pipelines, tanks, pumps, and other pressurised systems. Properly using and maintaining a pressure gauge is crucial to providing safety, preventing accidents, and improving the efficiency of equipment.

Types of Pressure Gauges: Choosing the Right One for Your Needs

There's no one-size-fits-all solution when it comes to pressure gauges. Different types are designed for specific applications, environments, and accuracy requirements.

Here's a quick overview of the most common types:

Bourdon Tube Pressure Gauge: A widely used mechanical gauge, it features a coiled tube that straightens as pressure increases. Common in industries like manufacturing and oil & gas, it provides reliable, cost-effective measurements.
Diaphragm Pressure Gauge: With a flexible diaphragm that bends under pressure, this gauge is ideal for low to medium-pressure applications involving viscous fluids or gases with solid particles.
Capsule Pressure Gauge: Featuring a capsule-shaped element that expands or contracts with pressure, these gauges are perfect for low-pressure systems such as HVAC or food processing.
Digital Pressure Gauge: Offering an electronic readout, digital gauges provide high accuracy and additional features like data logging and remote monitoring. Ideal for high-precision industries like laboratories and aerospace.
Manometer: Simple and easy to use, manometers are commonly used for measuring air or gas pressure in HVAC systems and laboratories.
Differential Pressure Gauge: Measures the pressure difference between two points in a system, essential for monitoring filtration systems, pumps, and airflow.
Vacuum Pressure Gauge: Designed to measure negative pressures or vacuums, these gauges are commonly used in laboratories and industrial vacuum systems.
Electric Pressure Gauge: These use electronic sensors for continuous monitoring, often found in automation and high-tech manufacturing environments.
Air Pressure Gauge: Specifically designed for measuring air pressure in a wide range of systems, air pressure gauges are commonly used in automotive, HVAC, and pneumatic systems. They provide accurate readings to provide optimal air pressure for performance and safety.
Bellow Type Pressure Gauge: The bellow-type gauge uses a series of expanding bellows that react to pressure changes, converting the motion into a readable measurement. These are commonly used for low-pressure applications and are highly effective for measuring gases and steam.

Choosing the right pressure gauge provides accurate readings, better system performance, and improved safety. Consider factors like pressure range, material compatibility, and your specific application to find the best tool for your needs.

Benefits of Using the Right Pressure Gauge

Using the correct pressure gauge brings numerous benefits:

Enhanced Accuracy: Accurate pressure readings are essential for maintaining the integrity of equipment and systems. Using the right gauge ensures that measurements are precise, reducing the chances of errors that could lead to overpressure or underpressure conditions. This, in turn, helps avoid costly equipment failures or accidents.
Improved System Efficiency: A pressure gauge that provides accurate readings enables operators to adjust pressure levels in real-time. Whether it's maintaining optimal pressure in a pump or ensuring air pressure in pneumatic systems is correct, proper monitoring leads to better performance and energy efficiency.
Increased Safety: Many systems, such as boilers, pipelines, and HVAC systems, operate under high pressure. Incorrect pressure readings can lead to system failure or safety risks like explosions. Using a reliable, properly calibrated pressure gauge helps prevent dangerous situations by ensuring that pressure remains within safe operating limits.
Cost Savings: By using the right pressure gauge and maintaining accurate pressure levels, you can avoid costly repairs, system downtime, and energy waste. Investing in high-quality gauges ensures that your systems operate at their best, saving money in the long run.

How to Maintain and Calibrate Your Pressure Gauge for Optimal Performance

Proper maintenance and calibration are key to getting the most out of your pressure gauge. Regularly maintaining your gauge can extend its lifespan, improve its accuracy, and prevent malfunction during critical operations.

Here's how to keep your pressure gauges in top shape:

Regular Inspection: Check the gauge periodically for signs of wear or damage. Ensure that the dial, needle, or digital display is clear and easy to read. Look for any cracks or leaks around the casing, which could compromise the gauge's performance.
Cleaning: Keep the gauge clean and free from dust, dirt, or corrosion that can interfere with its readings. Use a soft cloth or appropriate cleaning solution for the job. For gauges used in harsh environments, special protective coatings or cases may be necessary to protect them from chemicals or extreme temperatures.
Calibration: Over time, pressure gauges can drift from their original calibration. Periodically recalibrate your gauge using a reference standard to ensure it is providing accurate readings. This is especially important in industries like pharmaceuticals, aerospace, or manufacturing, where precision is critical.
Test for Leaks: Test for leaks in the system periodically, especially if the gauge shows irregular readings. Small leaks can lead to inaccurate measurements and pose safety risks. Using a leak detector to check for gas or liquid leaks can save you from larger, more expensive issues down the road.
Proper Storage: When not in use, store pressure gauges in a clean, dry area where they won't be exposed to extreme temperatures, humidity, or chemicals. This will help prevent damage and maintain their accuracy over time.

Real-World Applications of Pressure Gauges Across Industries

Pressure gauges are crucial tools in many industries, each with unique demands for safety and performance.

Here are some key applications:

Oil and Gas: Pressure gauges monitor pipeline, tank, and well pressure, preventing failures like leaks or explosions. Bourdon tube and differential pressure gauges are commonly used for safety and efficiency in extraction and refining.
Automotive: Used to check tyre pressure, engine systems, and fuel lines, pressure gauges help maintain safety and fuel efficiency. Both digital and analog gauges are standard tools in automotive workshops.
HVAC Systems: Pressure gauges ensure optimal refrigerant pressure and airflow, improving energy efficiency and system longevity. Diaphragm, capsule, and digital gauges are widely used in HVAC systems.
Pharmaceutical and Food Processing: Accurate pressure monitoring is essential for product quality and safety. Digital pressure gauges are used in clean rooms and production lines to maintain precise pressure levels and prevent contamination.
Water Treatment and Utilities: In water treatment plants, pressure gauges help monitor filtration systems and pumps, providing efficient processing, detecting leaks, and reducing energy waste.

Choosing the Right Pressure Gauge

Choosing the right pressure gauge is critical for ensuring accurate pressure readings, better system performance, and improved safety. Whether you're dealing with high-pressure systems in oil and gas or low-pressure environments in HVAC, understanding the different types of gauges ' from Bourdon tube and diaphragm gauges to digital and air pressure gauges ' helps you make an informed decision.

When selecting the right pressure gauge for your needs, consider factors such as pressure range, material compatibility, environmental conditions, and required accuracy. Whether you're maintaining industrial machinery, testing equipment, or ensuring safe operations in delicate processes, the right gauge will provide optimal performance, reduce risks, and ultimately enhance system efficiency.

By selecting the correct tool for your system, you'll provide long-lasting, accurate measurements and a smoother, safer operational experience.

Conclusion

In today's fast-moving industries, precision and safety are more important than ever. Pressure gauges are essential tools in keeping things running smoothly, whether it's monitoring pipeline pressure in the oil and gas sector, providing the proper tyre pressure in the automotive industry, or managing airflow in HVAC systems. Choosing the right pressure gauge for your specific needs is the first step toward improving system performance, avoiding costly repairs, and creating a safer environment for everyone involved.

But it doesn't stop at selection ' maintaining and calibrating your pressure gauges is just as crucial. Regular inspections, cleaning, and calibration help ensure that your gauges continue to deliver accurate readings, keeping your systems in top shape and reducing any potential risks down the line.

Ready to Boost Your System's Efficiency?

Choosing the right pressure gauge is important, but knowing how to use and maintain it is what really makes a difference. At MTC (Machine Tools Centre), we're here to guide you through every step of the process. Whether you need help picking the right pressure gauge or are looking for expert advice on automation solutions, our team is dedicated to supporting you with tailored, practical solutions.

Contact MTC today to learn how we can help you optimise your systems and provide peak performance with the accuracy and safety you need. Let's work together to take your operations to the next level!

FAQs

What is a Pressure Gauge Used for?

A pressure gauge measures the pressure of gases or liquids within a system to ensure they are within safe operating limits. It helps monitor performance and prevent damage or system failure due to overpressure or underpressure.

How Do I Choose the Right Pressure Gauge?

Choose a pressure gauge based on factors like the pressure range, material compatibility, environmental conditions, and accuracy required for your specific application, whether it's for industrial machinery, HVAC systems, or automotive use.

What's the Difference Between a Mechanical and a Digital Pressure Gauge?

Mechanical gauges use a dial and needle to display pressure readings, while digital gauges provide electronic readouts, often offering more precision and advanced features like data logging and remote monitoring.

How Often Should I Calibrate My Pressure Gauge?

Pressure gauges should be calibrated periodically, depending on usage and industry standards. In high-precision industries, calibration may be needed more frequently to maintain accuracy.

What Industries Use Pressure Gauges?

Pressure gauges are used in a variety of industries, including oil and gas, automotive, HVAC, pharmaceuticals, food processing, water treatment, and many others that require precise pressure measurement for safety and efficiency.

10 Steps to Selecting Your Pressure Gauge - Ashcroft's Blog

Ashcroft, a leader in pressure and temperature instrumentation, understands that you need accurate and reliable pressure gauges to keep your operation running efficiently. We also know the importance of following industry and regulatory standards for safety. However, finding the best solution to meet your unique specifications can be completely overwhelming.

We created this article to help simplify the pressure gauge selection process for you and give you confidence in your purchasing decision. When you are done reading, you will know about the primary factors to consider when selecting your pressure gauge and what steps to take in the pressure gauge ordering process.

Six factors to consider when selecting pressure gauges.

Before you start looking for the perfect pressure gauge for your application, yourself these six questions:

1. Does your pressure gauge meet your application's safety requirements?

Protecting your people and process is a top priority, especially in potentially hazardous conditions. For instance, if you use specialized equipment to handle ultra-high pressure, a rupture in the process could hurt the operator, damage your equipment and disrupt your process. In this case, choosing a high-pressure, solid-front pressure gauge that meets ASME safety standards will help protect the operator from rupture blowback and keep your operation running.

2. Are the pressure gauge materials compatible with the process media?

The wetted material you choose must be compatible with your process media. If you are using the wrong materials, you may encounter instrument damage or failure. The Ashcroft Material Selection & Corrosion Guide can help ensure that you choose the proper instrumentation for your application's media.

3. What are your pressure gauge material traceability requirements?

Material traceability provides a documented record of the origin and composition of the pressure instrument's materials. This traceability is crucial for ensuring that the wetted materials used in the instruments are suitable for the specific application's conditions, such as high pressures, extreme temperatures or corrosive environments. It also enables easier identification of any issues or recalls and simplifies bulk replacements.

gallopsensor are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

4. Do you have the right instrumentation for your application?

Your application has specific requirements for pressure range, temperature and other factors. Ensuring your instruments meet those specific demands is critical. For instance:

Temperature: Pressure gauges are rated for use in a specific temperature range. Using gauges in temperatures outside of their range can lead to damage, depending on their design and construction.

Range: Ashcroft recommends using ASME guidelines for selecting a pressure gauge with a full-scale range that allows the operating pressure to fall within the middle half (25% - 75%) of the scale. The full-scale range of the gauge should be about twice the desired operating pressure.

5. Do you know which product standards and/or approvals you need?

Whatever your required safety standards and regulations, Ashcroft has the necessary product approvals to validate that our instruments have undergone rigorous testing and comply with industry-specific requirements. This will give you confidence in the instruments' reliability and suitability for their intended applications.

Product Standards
' ASME B40.100
' EN 837-1
' CE
' RoHS
' Ingress Protection (IP65, 66 or 67, NEMA 4X)

Product Approvals
' 3-A
' Hazardous Location Approvals (ATEX)
' CRN
' R110

6. What's your budget?

The cost of a pressure gauge depends on the application, features and accessories you need. For example, the cost of a pressure gauge that measures air in a tank will be vastly different than a pressure gauge used in a power plant or processing facility. Common cost factors will include:

Gauge Type ' Depending on whether you need a commercial, industrial, critical process or test gauge, the cost could be anywhere from $10 - $1,000.

Features ' Accuracy, dial size and pressure range requirements are also factors in gauge cost. Typically, more accurate pressure gauges, larger dials and certain pressure range needs, including vacuum and compound ranges can be more expensive.

Options and Accessories ' Certain applications, especially those that involve hazardous conditions, may require options like a solid-front design, approvals, certificates and more that will add to the cost.

Selecting your pressure gauge in 10 simple steps.

Pressure gauges are not a one-size-fits-all solution. To ensure you get the best pressure gauge for your needs, be prepared to know the following:

1. Where and how will your pressure gauge will be used?

The type of pressure gauge you choose will depend on the industry and application. For instance, a gauge used in a high-purity environment has different requirements than one used in hydrogen systems.

Figure 1. Pressure Gauge Application Options.

2. Whether your pressure instruments require any approvals.

Some applications require approvals from nationally or internationally recognized agencies. See Figure 2.

Figure 2. Pressure Gauge Approval Requirements.

3. The type of pressure you are measuring.

There are two gauge styles:

One for measuring differential pressure. Measures the difference in pressure between two points in a system.
One for measuring gauge pressure. Measures positive pressure and vacuum pressure that is referenced to atmospheric pressure, and compound pressure that measures both positive and vacuum.

4. The pressure gauge size.

The dial or case size can vary based on the application and dimensions of where the gauge will be used:

'2" (50 mm) - Smallest sizes for compact areas.
2.5" (63 mm ) to 3.5" (90 mm) - Small sizes typically for high volume, commercial uses.
4" (100 mm ) to 6" (160 mm) - Common sizes for most process applications.
8.5" (215 mm) and above - Large sizes for easy viewing from a distance or test measurement and validation.

Read, Choosing a Pressure Gauge Dial Size to learn more.

5. The case style.

The style you need will depend on your application and safety requirements.

Open front. This style is designed with a pressure relief plug. There is no partition or barrier between the pressure element and the window. These cases are less expensive and most often used in commercial applications.
Solid front. This style has a blowout back design for added safety in hazardous environments. It has a partition with minimal openings between the pressure element and the window. These cases are typically more expensive and are often found in high-pressure applications in process plants, for example, that have the possibility of rupturing.

Read, Solid Front vs. Open Front Pressure Gauges to learn more.

6. The desired case material.

The case material you select must align with specific industry specifications and/or requirements. For instance:

Aluminum is often used for rugged outdoor applications that require metal construction.
Phenolic/thermoplastic can be found in process or specialty applications requiring corrosion resistance.
Stainless steel is used for sanitary applications and corrosion resistance.
Steel/black metal is a lower-cost option that is appropriate for high-volume commercial use.

7. The connection location.

This is where the pressure gauge will connect to the process. Your options will be:

Lower: connects to the process from the bottom of the gauge.
Lower back: connects to the process from the lower back of the gauge.
Center back: typically for panel mounting, the connection is from the back center of the gauge.
In-line: this connection goes through the two ports on either side of the gauge and is specially designed for differential and sanitary gauges.

8. The required pressure range for your application.

For this step, the range must align with the operating pressures of your process and follow ASME B40.100 best practices, which state the following:

Operating pressure should be 25% to 75% of scale, and the gauge range should be twice the operating pressure.
Ideally, the mid-scale on your dial should be around 12 o'clock or the mid-scale of the full-scale gauge span.
If pulsation is present, the maximum operating gauge pressure should not exceed 50% of the full-scale range.

Options include:

'10 psi (0.7 bar): Including gauge, vacuum & compound for low-pressure ranges
10 to 5,000 psi (0.7 bar to 350 bar): Including gauge, vacuum & compound for low-pressure ranges
5,000 to 20,000 psi (350 bar to 1,400 bar): Including gauge, vacuum & compound for low-pressure ranges
20,000 to 100,000 psi (1,400 bar to 7,000 bar): Including gauge, vacuum & compound for low-pressure ranges
'10 psid (0.7 bar): Low differential pressure
10 to 1,000 psid (0.7 bar to 70 bar): Mid-to-high differential pressure

9. The accuracy requirements for your application.

The accuracy of your pressure gauge should align with your application requirements and ASME B40.100 or EN837-1 best practices.

'±0.25% of span - for high-accuracy test and measurement applications. The best accuracy is as high as 0.05% of span.
±0.5% to ±1.0% of span - for high to mid-accuracy process applications.
±1.6% to ±2.5% of span - for mid-accuracy industrial applications.
'±3.0% of span - lower accuracy for general-purpose applications.

Read our blog to learn more.

10. The gauge's wetted materials.

If you want to avoid instrument problems stemming from corrosion, you should ensure the material for the instrument's wetted parts is compatible with the process material's composition, concentration and temperature. If it is not possible to choose a compatible wetted material, you can integrate a diaphragm seal/instrument isolator or isolation ring constructed from an appropriate material for the process. Check out our Material Selection & Corrosion Guide to find compatible options for your application.

Want to learn more?

Now you know all the factors to consider before purchasing your pressure gauge and the 10 steps to narrowing your search to the one that is best suited for your application. Remember, many applications present a unique set of challenges that can damage your pressure gauge and adversely affect your operation. If your pressure gauge will be required to withstand harsh conditions, Ascroft offers several accessories that are specifically designed to protect your instrument and optimize its performance.

If you still have questions, feel free to talk to one of our industry experts. In the meantime, here are a few articles we've written to address our customers' FAQs:

Are you interested in learning more about Industrial Pressure Measurement Devices? Contact us today to secure an expert consultation!

How To Identify Your Pressure Gauge and Get the Proper Replacement
How Does Temperature Affect Pressure Gauge Performance?
How Do I Select the Right Pressure Gauge Range?
How Often Should I Check the Calibration of My Pressure Gauge?

Previous: What Are the Advantages of automotive repair tape？

Next: How to Choose calcium carbide stone?

Guest Posts