Vacuum Gauges

A reliable source for Pressure Gauge information and leading Pressure Gauge Companies & Manufacturers.

High pressure gauges can be used to effectively read pressures up to 10,000 PSI; low pressure gauges generally measure pressures between 10 and 15 PSI. When gases and liquids are contained in sealed systems or closed vessels, internal pressure occurs. Read More…

Vacuum Gauges Vacuum gauges are instruments used to measure and display sub-atmospheric or vacuum pressures within a system or vessel.

Leading Manufacturers

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. Our inline flow meters monitor pump performance and media flows in hydraulic systems.

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HydraCheck $$$

Waukesha, WI  |  800-686-1789

Thuemling Instrument Group provides you with SPAN pressure gauges, liquid filled pressure gauges, duplex gauges and stainless steel gauges. Different types and sizes are available to suit just about any industrial purpose. We also offer transmitters and pressure switches. Check our website for more info.

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Thuemling Instrument Group, Inc. $$$

Toronto, ON  |  800-946-8377

Winters Instruments is a global instrumentation manufacturer of products such as high and low pressure gauges, differential pressure gauges and much, much more. We cover all markets including wastewater, petrochemical, HVAC, plumbing, food & beverage as well as many others. Our pressure gauges and thermometers have a 5-year warranty, while all other products carry a standard 1-year warranty.

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Winters Instruments $$$

Stratford, CT  |  203-378-8281

Ashcroft’s extensive product line is the benchmark in pressure and temperature measurement, including pressure gauges. Used globally in the most demanding environments, our instruments are known under the names Ashcroft®, Heise®, Willy® and Weksler® and offer multi-industry versatility. As a leader in technology and innovation, we design new products for current and emerging market requirements.

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Ashcroft® Inc. $$$
placeholder image HydraCheck Thuemling Instrument Group, Inc. Winters Instruments Ashcroft® Inc.

When the atmospheric pressure within an enclosure is below ~14.7 PSI, that enclosure is said to be a vacuum. It is impossible to artificially achieve a pressure of zero, and there are no examples of absolute vacuums in nature or in space. An enclosure can, however, be partially evacuated of its contents. Vacuum gauges are used to measure the extent to which enclosures have been evacuated; they measure low pressure, not negative pressure. Vacuum gauges are made from metal such as stainless steel or aluminum.

Some provide analog feedback in the form of a dial while others are digital meters. Gauge specifications include display types, scale types, vacuum range, operating temperature, accuracy and scale units. Dual scale devices provide the pressure reading in two sets of units while differential pressure gauges take and compare two pressure readings.

Vacuum Gauge Vacuum Gauges - HydraCheck

Some vacuum gauges include temperature compensation features to adjust possible errors due to changes in temperature. These instruments play an important role in industrial, manufacturing and scientific applications. Vacuums are frequently used to create cold temperatures for certain processes; without gauges the operator would not know the internal pressure, which can be dangerous and inefficient.

Vacuum gauges use several methods to take readings. One way is through a manometer, a U-shaped tube partially filled with a liquid like water, mercury or oil. A change in pressure causes the water column in each side of the U to rise or fall, which is detected by a sensor and then indicated on the dial or screen. Thermocouple gauges use a different technique. They measure the changes in the thermal conductivity of a gas inside a tube. A filament is heated to promote movement.

As electrons move from the source (cathode) to the drain (anode) they interact with the gas molecules, making them positive ions. This causes a current that is identified and measured. Similar gauges are also available with components that stay cool; this allows them to withstand sudden or prolonged exposure to high pressure gases. Vacuum gauges are also used in automobiles because of the presence of manifold vacuums that draw in air to power the engine of the vehicle.

This vacuum regulates the ratio of fuel and air so the engine can run at peak performance. Automotive vacuum gauges help identify the presence of air leaks in the system, which results in a rough idle, poor fuel economy and increased emissions. These gauges are attached to a plug on the intake manifold of the engine.

Vacuum Gauges Informational Video