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Setra Blog

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Jun 8, 2017 7:19:00 AM

What is Total Harmonic Distortion?

Imagine a tone being played by two musical instruments -  let’s say middle-C (261.63 Hz). While the pitch played on a piano may be the same as on an electric guitar, its timbre is very different. The sound wave generated from a piano or a simple synthesizer is relatively simple and clean, but the sound wave coming from an electric guitar is often very distorted for effect and contains natural harmonic overtones.

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Jun 5, 2017 8:47:00 AM

What is Hysteresis?

Hysteresis Defined

According to Merriam-Webster, hysteresis is the “lagging of a physical effect on a body behind its cause (as behind changed forces and conditions)”. When outside forces act on an object, that object will either immediately spring back to its original state, or more likely, it will somehow change or exhibit properties from previous deformations.

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Jun 1, 2017 6:51:00 AM

What is the difference between Rogowski Coils and conventional CTs?

Understanding specific job requirements, such as performance, installation, amperage load and environmental factors is critical to selecting the proper current transformer for an application. Conventional current transformers (CTs) do come with their limitations as they are difficult to install and are lacking in performance and measurement range. Rogowski coils have significant advantages with regards to installation, cost and performance.

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May 25, 2017 7:24:00 AM

What is the difference between strain gauge and capacitive transducers?

Setra is best known for pioneering the variable capacitance principle, the technological innovation behind capacitance-based pressure transducers. Variable capacitance transducers demonstrate industry-leading accuracy especially in low pressure HVAC and critical care applications with accuracies as high as ±0.25” water column (±0.009 PSI).

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May 22, 2017 6:37:00 AM

Why it's important to accurately measure barometric pressure

While changes in barometric pressure aren’t immediately obvious to human perception (except when your ears pop while hiking up a mountain), its effects can manifest themselves in many other ways. This is especially true in sensitive industrial and laboratory settings.

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May 18, 2017 8:48:00 AM

What is the difference between opening and closing gap sensors?

In many pressure sensing applications, high accuracy is a must-have. Whether you’re working with thousands of PSI or only a quarter inch of water column, the most demanding jobs require the best tools available. While there are many types of pressure sensing devices on the market, none quite match variable capacitance transducers in terms of accuracy and quality.

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May 15, 2017 9:03:55 AM

What is Submetering?

Submetering is the installation of metering devices with the ability to measure energy usage after the primary utility meter.  Submetering offers the ability to monitor energy usage for individual tenants, departments, pieces of equipment or other loads individually to account for their actual energy usage.  With submetering, a clear and accurate picture of how and when energy is being consumed inside a facility is created.

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May 11, 2017 6:42:00 AM

CE & RoHS Compliance: What you need to know

As of July 22, the RoHS exemption for industrial monitoring and control instruments will end. Non- compliant product cannot be CE marked and sold in the European Union or to customers who otherwise require the CE mark.

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May 4, 2017 6:33:00 AM

Is Building Automation and the Internet of Things Related?

The Internet of Things (IoT) is changing the way people run their homes. More and more devices are becoming available to consumers that allow them to automate their thermostats and regulate their power consumption, often-times controlling these systems from the phone in their pocket. Products like the Nest thermostat and the Sense home energy monitor provide homeowners convenient tools that also help save utility costs.

Building Automation

In commercial and industrial buildings, there are similar (albeit far more robust) systems and protocols used for the same purposes called building automation. Building automation is the automatic and centralized control of a building’s heating, ventilation, air conditioning, security, electrical, and other systems through a Building Automation System (BAS).

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May 1, 2017 8:33:25 AM

What is absolute pressure?

There is an incredibly diverse array of applications that require the measurement of air pressure. Depending on the application, users need to be able to interpret pressure readings in different ways and use appropriate units to reflect those readings accurately.

Absolute Pressure Defined

Absolute pressure is measured relative to a full vacuum. Alternatively, pressure that is measured against atmospheric pressure (also known as barometric pressure) is called gauge pressure. A full vacuum has an absolute pressure reading of 0 PSIA and average barometric pressure at sea level is ~14.7 PSIA.

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