Test & measurement NINVA:
A NON-INVASIVE TEMPERATURE SENSOR THAT MONITORS FLUID TEMPERATURES WITHOUT THE NEED FOR PROBES
WHAT ARE NON-INVASIVE TEMPERATURE SENSORS AND WHY SHOULD PROCESS OPERATORS CONSIDER MAKING THE SWITCH?
Non-invasive temperature sensors such as the NINVA from ABB can reliably monitor the temperature of fluids inside pipes without the need to insert a temperature probe into the flow. This makes them much easier to install and maintain, reducing both the upfront cost and ongoing maintenance over the lifetime of the instrument. Large-scale manufacturing sites typically include hundreds of temperature measurement points, so deploying non-invasive temperature sensors can deliver substantial savings in lifecycle costs and capital expenditure. For example, upfront costs relative to traditional thermowell installations can be as much as 75 percent lower, thanks to the easy-fit nature of the NINVA, which clamps to the outside of the pipe. A sensor can usually be mounted within minutes and full installation takes under an hour. The whole concept behind NINVA has been to make temperature measurement safer and simpler, without compromising on performance.
WHAT IS THE TECHNOLOGY THEY ARE REPLACING AND WHAT ARE THE DRAWBACKS OF THE TRADITIONAL APPROACH?
Traditional thermowells are installed through a hole in the pipe wall into the path of the process fluid. They form a protective sheath around the sensor itself and guard against potentially damaging conditions such as high pressure, abrasive or corrosive chemicals and fast-flowing liquids. They are widely used, well understood and relatively low cost, reliably giving users an accurate picture of what is
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In this Q&A Jon Davison, product manager for Level, Pressure and Temperature at ABB, discusses ABB’s NINVA
happening inside the pipe. However, installation involves drilling into the pipe, which may only be possible during a shutdown. In addition, the materials and other specifications must be carefully tailored to suit each application, because the thermowell must withstand direct exposure to challenging process conditions.
October 2024 Instrumentation Monthly
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