Clamp-On Flow Meters

A reliable source for Flow Meter information and leading Flow Meter Companies & Manufacturers.

This flow meter type is popular in industries such as: food and beverage, pharmaceuticals, wastewater management and water treatment, pulp and paper, power, HVAC, and mining. Within these industries and others, they are often used to measure the flow of dirty and highly hazardous or corrosive fluids. Read More…

Clamp-On Flow Meters Clamp-on flow meters, sometimes known as non-invasive flow meters, are ultrasonic flow meters designed to measure flow without physically touching the fluid.

Leading Manufacturers

Monterey, CA  |  831-373-0200

Sierra manufacturers high performance mass flow meters and controllers for nearly any gas, liquid or steam. Customers choose Sierra when they need an accurate and repeatable flow measurement, short delivery lead times, and expert flow advice.

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Sierra Instruments $$$

West Valley City, UT  |  800-316-5342

HydraCheck offers everything needed to service, maintain and troubleshoot hydraulic systems at prices you can afford. We manufacture and distribute diagnostic test kits, flow meters, pressure gauges, tachometers, etc.

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HydraCheck $$$

Orangeburg, NY  |  800-866-3837

Aalborg Instruments & Controls is a globally recognized manufacturer of precision instrumentation for flow measurement and control. We offer variable area flow meters, thermal mass flow controllers, and more. Since our founding in 1972, it has been our commitment to develop, produce and deliver the highest quality products and services, as well as consistently meet or exceed customer requirements. We are ISO 9001:2015 certified.

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Aalborg Instruments & Controls, Inc. $$$

Concord, CA  |  925-687-8363

Since our founding in 1972, RCM Industries has served industries ranging from pharmaceutical to chemical to food and beverage. Our flow meters are designed to improve productivity, reduce cost, and protect the most sensitive equipment and processes. All flow meters are suitable for measuring water, oil, and most low viscosity liquids, and are available in Monel, stainless steel, and bronze alloys. No matter what your application, we aim to exceed your expectations.

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RCM Industries, Inc. $$$

Kent, WA  |  800-975-8153

SeaMetrics, a flow meter manufacturer, produces turbine flow meters, paddle wheel flowmeters, insertion flow meters, low-flow meters, water flowmeters, pulse flowmeters, flow sensors and electronic controls.

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SeaMetrics, Inc. $$$

Blythewood, SC  |  803-714-2000

Spirax Sarco is an established manufacturer of a variety of flowmeter products for liquid, gas and steam applications for a wide range of markets. Spirax Sarco is able to provide its customers with a family of products capable of measuring and controlling most liquids and gases.

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Spirax Sarco, Inc. $$$
placeholder image Sierra Instruments HydraCheck Aalborg Instruments & Controls, Inc. RCM Industries, Inc. SeaMetrics, Inc. Spirax Sarco, Inc.

They are so useful for these types of applications because, since they do not actually come in contact with the fluids, the flow meter sensor heads are not at risk for damage like corrosion.

Instead of reading flow from inside the pipe, they read flow from the outside of the pipe, the surface to which they are clamped. There, the flow meter sensor(s) collect flow data by sending and receiving ultrasonic pulses. They send their collected data to a connected readout for interpretation. Typically, this readout device is digital, but it can also use analog outputs, relay outputs, binary + RTD inputs, or a combination of all of them.

Most often, these highly useful flow meters come in single and dual-sensor models. Single sensor meters work using piezoelectric transmit and receive crystals that are planted in just one sensor body. Customers clamp these onto a single point on the pipe surface and connect the sensor to the pipe using a coupling compound. Dual-sensor meters are built with the transmit crystal in one sensor body and the receive crystal in the other.

The main drawback of clamp-on flow meters is the fact that they do not work well with pipes that are lined, particularly linings of copper, concrete, plastic or fiberglass. This is because the lining interferes with transmit and receive signals, making the flow meter readings inaccurate.

Nevertheless, the unique, non-invasive nature of clamp-on flow meters presents a variety of benefits. First, the monitored flow remains undisturbed and without pressure drops. This allows for undistorted, more accurate readings. In addition, during installation, it is not necessary to break open your pipe system in order to insert the flow meter. Rather, you can easily install and uninstall the meter by clamping on to your pipe. This not only saves you time and money, but also makes it less likely that your system will leak or become contaminated. Also, because your meter will not be exposed to fluids, it will last longer. This is cost-effective both in the short and the long run; if you like, when you’re done with one application, you can remove your meter from the pipe and use it on another.

Clamp On Flow Meter Informational Video