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How to Select a Pressure Gauge

It isn’t always easy to know which gauge one needs as there are several factors to consider. To help make this process simple, we’ve created a check list that will help get you started. You can download the quick version here. Below, we broke down each step of selecting a pressure gauge so you know the most common options. Need something custom? Don’t hesitate to get in touch.

What is the process media?

The first factor to consider is the type of process media being measured. Excessive temperatures and corrosive or highly viscous media may affect the gauge performance so you’ll want to understand how the process media will affect the gauge internals.

What is the environment like?

Will the gauge be subjected to water? Chemicals? Shock or vibrations? Any of these factors can add additional stress to the accuracy and performance of the gauge. Select a gauge suited to the environment by considering the case materials, internal materials, and fill fluids.

  • Case materials: plastic, black steel, stainless steel, phenolic/poly, brass
  • Internal materials/wetted parts:
    • Brass is preferred for applications such as air or hydraulic fluid.
    • Stainless steel is commonly used with applications such as drinking water, hydraulic fluid, or anything that would be corrosive to brass.
  • Fill fluids (if needed): Silicone or glycerin
    • Fill fluids protect the internals of the gauge by absorbing shock and vibration. This helps to prolong the life of the gauge and ensure a steady pointer for an accurate pressure reading.
  • Safety requirements: Most likely, if there are any safety requirements, the customer would mention them at the start of the conversation but it doesn’t hurt to ask. A few common safety requirements are hermetically sealed, solid front, or blowout back designed gauges.

How will the gauge be mounted?

  • Lower/bottom mount
  • Center back mount
  • Lower back mount
  • Panel mount – U-clamp or front flange?

What dial size do you prefer?

Choose a dial size that is easy to read from the location where measurements will be recorded. The further away, the larger the dial should be. Our most popular sizes are 1 ½”, 2”, 2 ½”, 4”, 4 ½”, and 6”.

What is the process connection size?

Our most popular sizes are 18” NPT, ¼” NPT, and ½” NPT

Are there any special requirements, custom options, or other accessories?

  • Pointer
  • Window material
  • Fill media
  • Custom dials and ranges available
  • Siphons
  • Needle valves
  • Diaphragm seals

What is the pressure range?

We recommend selecting a gauge twice the normal operating pressure to reduce the chances of a blowout due to over pressurization. For example, if the operating pressure is 100 psi, you’ll want to choose a 200 psi gauge.

We’re here to serve you. That’s why we carry the most inventory in the industry with over 4,200 active SKUs, ready to ship the same day. With over 30+ years of industry expertise, our team is dedicated to helping you get the process instruments you need, when you need them. Let us show you the ESP difference with our SPEED, SERVICE, and AVAILABILITY. Request a quote now or give us a call at 1-888-650-6923.