How Compound Pressure Actually Works | Blog

Compound pressure sensors measure both positive and negative pressure.When selecting a pressure transducer, or a digital pressure gauge, it is important to understand pressure types, and how they perform under different circumstances.

We have already given an overview of each pressure type, and covered absolute and sealed pressure specifically.

A compound pressure gauge is a device that can display both negative and positive values for pressure. Oftentimes you need a compound pressure gauge when you are trying to measure something that can be either a positive or negative value, like a refrigerator.

Today we want to highlight Compound Pressure, how it works, when to use it, and the pros and cons associated with it.

How How Compound Pressure Works

Compound pressure works by using a sensor that is capable of compound pressure measurement. This means that it can measure both positive and negative vacuum pressures. With a compound pressure gauge, the zero reference of the sensor is set at ambient pressure. The sensor is not sealed but has a vent hole that allows inherent compensation for atmospheric pressure changes.

When to use it

Compound pressure is used to measure both positive and negative pressure. Some examples include leak testing of pressurized lines, test chambers in labs, and general purpose low pressure measurements.

The effectiveness to measure both vacuum and positive pressure is limited to lower pressure ranges. Typically they are used for pressure measurement of 200 psi or less. If a compound pressure transducer is used for higher pressure ranges, the error band of 0.25% of full scale can exceed the vacuum range of -14.7 psi.

Pros and Cons


  1. Not subject to atmospheric pressure variations
  2. Versatile solution for low pressure measurement


  1. Poor performance in higher pressure ranges
  2. Needs protected from moisture and dust

Contact our support team if you have any questions about compound pressure, whether or not it will work for you, of any other pressure type.

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