Outdoor Flowmeters | McMaster-Carr

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125 Products

About Flowmeters and Totalizers

Flowmeters measure the rate of flow for a liquid or a gas. Totalizers measure the cumulative flow volume. Flowmeter/totalizers display both the flow rate and the cumulative flow volume.

High-Temperature Flowmeters with Digital Display

Check the flow rate of liquids up to 200° F from an easy-to-read digital display instead of a scale or dial.

Flowmeter/Totalizers

Determine the flow rate and total volume of liquid flowing through your system with the same meter.

Flowmeter/Totalizers with
Sanitary Quick-Clamp Fittings

Easy to remove for cleaning and maintenance, these flowmeter/totalizers connect to sanitary quick-clamp fittings (often called tri-clamp fittings) and measure the flow rate and volume of liquid passing through your system.

Socket-Connect Flowmeter/Totalizers
with Remote Display

Often used in hard-to-access areas, these flowmeter/totalizers have a display that can be placed up to 25 feet from the sensor. They connect to unthreaded PVC pipe.

High-Temperature Flowmeter/Totalizers

With one meter, these flowmeter/totalizers measure the flow rate and total flow volume of high-temperature liquid up to 200° F.

Flowmeter/Totalizers for Oil and Fuel

Use these flowmeter/totalizers to measure both the flow rate and total flow volume of oil, gasoline, diesel fuel, and kerosene.

High-Temperature Totalizers with Digital Display

The digital display on these totalizers makes it easy to check the total amount of high-temperature liquid—up to 200° F—passing through your system.

Flow Switches

Variable-Pressure Flow Switches

Accurate even in applications where pressure fluctuates regularly, these flow switches split flow into two paths and measure their difference in pressure drop to calculate the flow rate of liquid.

Fixed-Setpoint Hazardous Location Flow Switches

Safe to use where flammable gases and combustible dust may be present, these switches activate or deactivate when your flow reaches a factory-set level. All are UL listed for hazardous environments.

Hazardous Location Flow Switches

UL listed for use where flammable gases or combustible dusts may be present, these flow switches activate or deactivate equipment when your flow rate reaches a set point.

Insertion Flow Switches

Avoid complicated inline installation—these flow switches insert into a tee or pipe outlet, so you don’t need to disassemble your pipeline.

Hazardous Location Insertion Flow Switches

Safely activate and deactivate equipment in environments with flammable gases and combustible dust when your flow rate reaches a set point. These switches save you from disassembling your pipeline because you insert them into pipe tees or pipe outlets instead of mounting them inline.

Airflow-Actuated HVAC Switches

Use this switch to sense changes in airflow velocity.