Flow meters are devices used to measure and monitor the flow of gases and liquids through various systems. These instruments are designed and manufactured for use in a multitude of different industries and applications. They can vary in construction, size, configuration, and measurement technique. Some flow meters have to be built to operate effectively while exposed to volatile liquids, others have to handle a much larger volume of fluids, and still others have to measure mass instead of volume. All of these different factors contribute to the huge diversity in flow meter design. Other important factors include cleanliness, pressure, and operating temperature.

Manufacturers across practically all industries understand the importance of flow meters in everyday industrial processes. They are used to maintain efficiency and to help better understand profit gains and losses. The automotive, petroleum, HVAC, food and beverage, utility services, chemical, and many other industries all utilize flow meters extensively to monitor their operations.

Some of the most frequently used and most popular flow meters include: water flow meters, peak flow meters, air flow meters, peak flow meters, fuel flow meters, and ultrasonic flow meters. Typically, these flow meters come in two general varieties: volumetric flow meters and mass flow meters.

As their names suggest, one produces a measurement based on the volume flowing through the instrument while the other produces a measurement based on the mass of the fluid flowing through the instrument. These measurements can then be used to determine optimal flow rates for different processes or to track the use of specific fluids. Read More…

Leading Manufacturers

Sierra Instruments

Monterey, CA | 800-866-0200


Sparta, NJ | 888-722-3569


West Valley City, UT | 800-316-5342

John C. Ernst Co., Inc.

Sparta, NJ | 888-463-7678

Hoffer Flow Controls, Inc.

Elizabeth City, NC | 800-628-4584

Siemens Process Instrumentation

Spring House, PA | 800-365-8766

Some flow meters also come with a switch which allows them to measure and control flow, helping keep the rate of flow at a safe and efficient level.

Other flow meters include flow indicators that utilize a viewing window to provide a visual indication of the flow, and another type, vortex flow meters, use obstructions to change flow pressure which can be used to measure flow.

There are many unique and useful ways to measure flow, and these methods are represented in a variety of different flow meters. Thermal mass flow meters utilize two temperature sensors to measure heat loss in a fluid which can be used to calculate the flow rate.

The Coriolis Effect can also be used to measure flow rates. Flow meters that use this method are called Coriolis flow meters, and these instruments use a tube that moves and rotates due to the flow of fluids inside. The forces behind these accelerations are then used to determine the rate of flow.

Flow Meters
Flow Meter – John C. Ernst Co., Inc.

Ultrasonic flow meters use sound to measure flow, electromagnetic flow meters operate under the principles of Faraday’s law, and rotometers determine flow using rotating floats.

With so many different flow meter types and configurations, it may be difficult to determine which meters are best for a particular application.

Fortunately, flow meter manufacturers have the industry expertise and experience to help customers determine which features and instruments are most vital.

Many manufacturers can also provide customized solutions to address specific factors and influences, and they can precisely meet application requirements.

Flow Meter Informational Video