Water Pressure Gauge: Everything You Need to Know

A water pressure gauge tells you how much water pressure is in a system. It connects to a water pipe or tank and measures the force on it in units like Pascal, bar, or Torr. Water pressure gauges are very useful devices for everyday life. They are easy to use and last a long time. They also provide information about pressure quickly and efficiently, which is important for various water applications.

The water pressure in a system can be static or dynamic. Static pressure is when the water pressure is the same in all directions. Dynamic pressure is when the water has more pressure because it is flowing. The dynamic pressure doesn’t have much effect on surfaces that are parallel to the flow direction. Still, it helps measure how fast the water flows and how much pressure the water system has.

The difference between two pressures is measured using dynamic pressure. A water pressure gauge monitors a system’s “gauge pressure.” It is defined as the absolute pressure less the ambient pressure. The atmospheric pressure can affect gauge pressure measurement if it’s close to the water pressure gauge installed. You can learn more about types of pressure here.

Bourdon Tube Operation

Water pressure gauges have been used for a long time. People have used different ways to measure water pressure. Each method has its advantages and disadvantages. The most common water pressure gauge is the Bourdon gauge. This article explains how it works.

Pressure gauge types include bellows, diaphragm, liquid-filled, and digital pressure gauges. But they are not as common as Bourdon Gauge. The Bourdon Gauge is a mechanical device that uses the principle that when fluid pressure is applied to the tube inside, the oval cross-section becomes more circular, straightening the tube. The cross-section change can be inconspicuous depending on the workability and the material’s elastic range.

Pressuring the tube, it tends to straighten or uncoil into a C-shape. When the pressure is gone, it goes back to its normal position.

The water pressure gauge is connected to a water system. When the water pressure increases, it flows into the measurement device through the inlet pipe. The socket block connects the device and intake pipe to the process line. Fluid pressure pulls one end of the Bourdon tube, straightening it. The Bourdon tube’s sector gear receives this straightening motion.

The gearing system makes the motion at the end of the Bourdon tube bigger. It makes the needle move more. The needle moves in a circle over a scale marked with numbers.

Selection Criteria

There are a few things to consider when choosing the correct water pressure gauge for your needs. Below we will look at the most critical factors.

  • Measuring range: Water pressure gauges measure the pressure of water. The gauge measures from 0 to the maximum pressure. The number on the meter is the pressure. You need to pick a gauge that goes up to the highest number your machine can. If the number is too high, you will not be able to know what the actual pressure is.
  • Accuracy: If the precision measurement is very important to what you are doing, ensure the water pressure gauge is accurate enough to see small changes in pressure. Keep in mind that the range of measurements you choose also affects accuracy. Learn more about pressure measurement accuracy.
  • Connection size, type, and location: There are different sizes for water pressure gauges. The size is usually measured in inches. Your size depends on the pipe size and if there is already a hole for the gauge. It is essential to select the proper connection type. Most gauges have a cylindrical connection that can be replaced easily. It would be best to consider where you want to put the gauge and how much space you have.
  • Maximum operating temperature: Most water pressure gauges work within the 60 – 80 C temperature range. There are special water pressure gauges for high-temperature applications.
  • Unit of measurement: There are different pressure measurement units (Pascal, bar, technical atmosphere, standard atmosphere, Torr, Psi). Most water pressure gauges have two units on the indicator. Make sure to select the version that has the unit you are most comfortable with.
  • IP protection: The IP code is important, especially if you use the water pressure gauge in an environment with dust, condensation, or water splashes. The higher the IP rating on the gauge, the more expensive it will be.
  • Digital reading: If you need a water pressure gauge, you can choose between one that is digital or has a dial indicator. The digital one needs power to work, while the dial indicator does not.

Applications

  1. Pool filter pressure gauge: A pool filter gauge helps you keep track of the pressure in your pool. If the pressure changes a lot, it might mean that the filter needs to be cleaned. Low pressure usually means there is a flow issue.
  2. Irrigation and sprinkler system: Water pressure gauges are used to measure water pressure in an irrigation network on a farm or in a sprinkler system in a garden.
  3. Detection of leakages: Water pressure gauges indicate a leak in a closed water system, like a heating system or process line.
  4. Measuring tank volume with pressure: A pressure gauge can help track how much water is in a tank. If the pressure changes, it means that the water is being discharged or filled.
  5. Pressure: Houses with good use water pressure gauges to measure the well’s water pressure. This way, they will know if they need to get water from another source or if they need to drill another well.

Read more: Testing Your Water for Contaminants

Frequently Asked Questions About Pressure Gauges For Water

What Is a Pressure Gauge Called?

Pressure gauges, vacuum gauges, and compound gauges (vacuum & pressure) are instruments that measure and display pressure physically. The popular Bourdon gauge is a mechanical instrument that measures and denotes pressure.

What Is Gauge Pressure Formula?

The difference between ambient pressure and system pressure is the gauge pressure. Gauge pressure equals system pressure multiplied by atmospheric pressure.

What Are the Two Types of Air Pressure?

There are two types of pressure – absolute and gauge pressure—the distinction between them lies in how they are compared to a particular standard.