Blog Pressure Transducers

Explore Our Radiation-Tolerant MV/V Pressure Transducer [Video]

The SST 64X-RT Series is ideal for a wide range of demanding applications—from satellite propulsion systems to reactor pressure management. Learn more about its features and specifications in our latest video.


An Important Update About Sigma-Netics Operations During the COVID-19 Pandemic

As all of us confront the COVID-19 crisis, we wanted to let you know about the status of our operations. Sigma-Netics is an essential manufacturing business as a critical supplier in defense and medical supply chains. Both our New Jersey and Virginia facilities continue to operate—accepting new orders and shipping existing orders for pressure switches, pressure sensors and metal bellows.

The health and safety of our customers and employees is our primary concern, and we have undertaken additional sanitation measures and are practicing social distancing within our facilities. All employees not directly involved in assembly or manufacturing are working from home.

We will continue to monitor global and domestic conditions, and we will provide updates on changing business conditions if they occur.

Blog Pressure Transducers

Satisfying the Unique Pressure Sensing Needs of Submersible Vehicles

Recent growth in unmanned underwater vehicles (UUVs) across several industries is also creating a need for depth transducers that can satisfy unique sensing and instrumentation requirements. Not only must UUVs operate in difficult conditions, their designs are as varied as their missions. That’s why we introduced a depth measurement device for use with submersible vehicles — the SST 74X-UV Series transducer.

Sigma-Netics SST74X UV Transducer

Our SST 74X-UV transducer meets the submersible industry’s demand for precise depth measurement, boasting accuracy of ±0.15 percent full scale output (FSO) total error band (TEB). The sensor is also versatile, featuring a configurable-flange design that allows outboard or inboard bulkhead installation along with digital and analog outputs to allow designers to connect to their choice of instrumentation. Additional features and specifications include:

  • An easily cleanable wetted area.
  • Outer diameter: 0.75 inches (19 millimeters) max.
  • Lightweight: <0.2 pounds (90 grams).
  • Standard ranges: 0-100, 250, 500, -750, 1500, 2000, 3000, 5000, 7000, 10000 psia/psig/psis.
  • Wetted parts made from 15-5 PH stainless steel or Inconel.

Greater Design Freedom

The SST 74X-UV is the latest in our growing line of Sigma-Netics pressure transducers that perform in harsh operating environments. By combining accurate pressure sensing with a configurable-flange design and both analog and digital outputs, the SST 74X-UV transducer gives engineers the freedom they need to implement depth measurement into their UUV designs.

For more information about Sigma-Netics’ SST SST 74X-UV depth transducer, visit


Announcing Our Recent AS9100D Certification

We’re pleased to announce we were recently awarded AS9100D approval for the design and manufacture of our pressure switches, pressure transducers, metal bellows and other products.

Developed by SAE International, AS9100D is a globally recognized quality management standard for the aviation, space and defense industries and incorporates the latest ISO 9001:2015 requirements.

The certification represents our ongoing commitment to improving our product quality even further while also satisfying our growing base of aerospace, defense and commercial space customers.

Blog Pressure Switches

Pressure Switches Combine Accuracy and Reliability for Oil and Gas Operations

Pressure switches for oil and gas facilities have to meet a set of challenging requirements. Not only should the switch provide exceptional accuracy and reliability, but it also must be suitable for use in hazardous locations—and carry the safety ratings to prove it.

Our Model 703-U and 703-UJ explosion-proof pressure switches with piston actuation combine uncompromising safety and protection with the accurate, reliable switching that mission-critical operations demand. The switches are listed for use in hazardous locations as specified by UL Class 1 Division 1, Groups A, B, C and D and Class 2 Groups E, F and G. And, they are NEMA Type 7 Rated for explosion protection.

They also feature a rugged, piston-actuation design to ensure optimal reliability. That’s because switches with a piston-based design are particularly able to manage high pressure spikes, leaks, vibration, shock and thermal extremes without losing accuracy or failing prematurely.

The pressure switches provide two options for safe and secure control of set points:

  • Model 703-UJ has been designed for easy field adjustment, letting users adjust pressure levels as conditions change. Once the setting is in place, 703-UJ’s tamper-resistant locking mechanism keeps it secure.
  • Model 703-U, which has factory-set pressure.

Along with its piston design, the highly rugged Model 703-U/UJ features:

  • NEMA Type 7 Rating for explosion protection.
  • 316 stainless steel construction to resist corrosion.
  • High overpressure capability.
  • Pressure handling up to 5000 psig.
  • Wide operating temperature range of -40°F to 180°F
  • Long lifetime — the snap-action switch has been tested to 1 million cycles.

Model 703U/UJ pressure switches are suitable for a wide range of upstream and downstream oil and gas operations such as offshore exploration, petrochemical processing and oil and gas pipelines. Additional applications include industrial OEM equipment and control panels.

To learn more about pressure switches for harsh environments, download our white paper.

Blog Pressure Switches

New Paper Explores How Pressure Switch Customizations Overcome Design Challenges

Download The White Paper

Pressure switches are often considered commodity items. But for many mission-critical or demanding applications—including aerospace, pharmaceuticals and chemical processing—your switch may require a custom mechanical design or electrical features that go beyond what commercial off-the-shelf switches can offer. With a little extra engineering, you can boost the performance of your switch and even overcome challenges your pressure system may be experiencing as a result of its operating environment.

In a new white paper, we explore some recent applications that demonstrate how custom-engineering our pressure switches has improved the functionality of the switch—as well as the reliability of the overall system.

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Flush-Mount Pressure Switches—And Transducers Too

Food, pharmaceutical and chemical processes often use tubular equipment to mix, transport or store materials. In these applications, it’s a good idea to keep any internal switches or sensors from protruding too far into the tube—where they can create a toehold for material buildup or impede flow. That’s where our newest pressure switch design comes into play.

This custom switch’s sensing element has been designed and manufactured to match the interior curvature of a specific food processing machine. The only part that protrudes into the flow within the machine is a low-profile, seamless seal that provides no place for materials to hang up during production.

While this particular flush-mount switch was designed for a specific use, the same approach can be applied to a wide variety of processing machines. We can alter the design of the switch for tubular structures with internal diameters as small as three inches.

We’ve also created a similar design for flush-mount pressure transducers.

Click here to learn more about our custom pressure switch capabilities.

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Off-Road Vehicle Sees Success In Pressure Switch Signal Delay


If your hydraulic systems suffer from pressure spikes, your pressure switches may not work as expected. The spikes can trigger the switch prematurely, even though continuous pressures remain below the set point. The result is a hard-to-control hydraulic system plagued by false switching signals.

Fortunately, there’s a simple solution to these spike-induced switching errors: Just add a time delay to the switch. That’s exactly what we did in a recent application.

Off-Road Vehicle Experiences Pressure Transients. In an off-road vehicle, a pressure switch was used as part of a hydraulic monitoring system, which was designed to trigger a warning light in the cabin if it experienced sustained excess pressure. But driving over rough terrain was causing unintended pressure spikes, causing the annunciator light in the crew compartment to constantly switch on and off.

Our engineers incorporated a PC board into the pressure switch that was programmed to delay signal output based on certain adjustable parameters, including the amount of time—down to the millisecond—and whether the signal occurred on the rising or falling pressure. In this case, engineers set the time delay at 3.2 seconds. As a result, the warning light remained off unless a pressure change lasted longer than that.

Pressure Switches For Tough Environments. In addition to integrating time delays, these pressure switches had to be ruggedized for use in an off-road application and are designed to withstand pressure spikes, leaks, temperature extremes, moisture, chemical exposure, vibration and shock loads. These ruggedized features include:

  • Proof pressures up to 12,000 psig
  • Maximum operating pressures up to 7,500 psig
  • Wide temperature range of -40 to 250°F
  • High overpressure capability
  • High shock and vibration survivability
  • Snap-action electrical switch tested to 1 million cycles
  • IP67 compliance

To learn more about pressure switch design, download our latest white paper.

Blog Metal Bellows

Video: Bellows for Temperature Switching

Temperature switching is another common use for metal bellows. The bellows are typically attached to a fluid-filled capillary. Changes in temperature cause the fluid to expand or contract, causing the bellows to move and actuate a switch, a gauge, or a valve. Bellows are found across many industries and are used extensively in thermostats, self acting temperature valves, and other industrial control systems. Watch our latest video to learn more.

Blog Pressure Switches

New Diaphragm-Operated Pressure Switches For Tough Environments


With the release of our 745 and 785 Ruggedized Pressure Switches, we’re expanding our product line to help you better address low pressure applications that require high-sensitivity.

745 Pressure Switch. Our diaphragm-operated Model 745 Fixed Setting Pressure Switch is designed for low-pressure operations that require a compact form factor and high degree of sensitivity. Typical application examples include off-road or industrial OEM equipment, train braking systems, compactors, compressors and fuel systems.

785 Pressure Switch. Equipped with either a 2- or 3-pin Deutsch connector, this miniature, diaphragm-operated pressure switch is designed for high-sensitivity, low-pressure applications. Like the 745 model, this switch is IP67-compliant and has a NEMA Type 4 rating for a high degree of protection in rugged indoor and outdoor applications.

Both pressure switches are built to thrive in tough environments, providing pressures between 7 and 160 PSIG. They can withstand oil, fuel, water, dust, vibration and shock and feature a wide temperature range of -40 to +250°F.

Depending on the application, you can choose from several standard electrical and pressure port configurations. You can also customize your model with special items, including wire, cable, seal materials and weather-proof connectors.

For more information on the 745 Series, download the 745 Series Datasheet.

For more information on the 785 Series, download the 785 Series Datasheet.