Technology Archives

Dual Switch or DPDT Switch? What is the difference?

Posted on February 9, 2026 (February 10, 2026)

A Dual Switch has (2) independent micro-switches in one housing. Most commonly, a dual switch contains 2 SPDT (Single Pole, Dual Throw) switches. The key point is that there are two independent set points, each switch with its own mechanical actuator. A Dual switch is chosen if two independent set points are needed, or the user

How to wire a SPDT mechanical switch

Posted on May 10, 2021 (May 14, 2024)

Determining the wiring configuration (Normally Open or Normally Close) to a SPDT mechanical switch can seem confusing at times. However, the concept behind it is relatively straightforward. Wiring arrangement depends on 2 things: Whether the application is on the rise (i.e., trip above setpoint) or on the fall (i.e., trip below setpoint) Whether the load

Switch information for instrumentation engineers

Posted on April 26, 2021 (July 18, 2024)

The worst nightmare for instrumentation engineers and technicians is a call due to an unexpected shutdown. Many plants are complex systems of highly technical equipment and machinery intertwined to accomplish their production function. Regardless of whichever problem occurs, the goal for the day is to get back to business as soon as possible, which includes

Mechanical Switch vs. Electronic Switch: Savings upgrade

Posted on March 29, 2021 (November 3, 2025)

Many times, when specifying replacement switches I&E technicians may feel most comfortable replacing "like-with-like", and stick with a mechanical switch. Users may be acclimated toward electromechanical switch maintenance and may not be fully aware of the hidden maintenance costs vs. those associated with an electronic switch serving the same function. Electromechanical switches are built from

The role of mechanical switches in a cybersecure environment

Posted on March 12, 2021 (May 14, 2024)

Back in 1681, Denis Pepin designed the first pressure relief valve to keep his experimental steam chamber from exploding. His idea was simple – to use the process’ own power as the safety operator, rather than an external system. Fast forward to 1931 when the modern rupture disc was invented using the tensile strength of

How UE’s One Series Safety Transmitter will keep your workplace safe and efficient

Posted on June 16, 2024 (May 7, 2025)

For a long time, process transmitters have been the only game in town when it comes to measuring devices in Instrumented Protective Systems (IPS). However, most brands of process transmitters today are dependent on logic solvers (like PLCs) and therefore do not have the diversity or physical separation recommended by the latest safety standards to

3 Reasons to Select a Safety Transmitter

Posted on February 11, 2021 (October 31, 2025)

A typical Safety Instrumented System (SIS) consists of a Safety Integrity Level (SIL)-certified sensor, logic solver, and final element. These SIS systems can be complex, including multiple components such as a pressure or temperature transmitter, safety relay, programmable logic controller (PLC). Also, it can include a trip amplifier; and requires intensive wiring and programming. See

10 reasons to choose the ONE Series electronic switch

Posted on December 17, 2020 (November 3, 2025)

The One Series is our smart electronic switch with a variety of different models including low capacity and high capacity switch outputs, transmitter options, and a variety of other useful features. More information can be found in our technical brochure for the One Series models. In order to summarize some of the benefits of using

Recommended practice for antenna positioning for wireless devices

Posted on December 3, 2020 (May 16, 2024)

We recently had a case where our customer needed to place a detector high on a tank and the nearest gateway was about 150 ft below the walkway. There were not enough wireless instruments to relay the signal and the antenna was fixed to the detector. The device would not sync with the gateway until

One Series: Smart switch or SIL transmitter?

Posted on November 12, 2020 (October 27, 2025)

No matter whether you are in an oil rig or in a manufacturing line, the need to keep the plant up and running is paramount. Is it more valuable to stick upgrade to a smart electronic switch, or install a SIL rated transmitter? Many industrial plants use our standard ‘blue’ product line, the One Series

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