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Feeling the heat
or 3 g across a frequency range 10 to 500 Hz. Due to the use of specialist a mineral insulated cable the standard ABB temperature sensor far exceeds the IEC standard within a resistance of 10g, with option to extend this to 60g through the use of a high vibration design. In context your typical person can withstand a maximum of 9g for just a few seconds before passing out and your average rollercoaster will hit a measly 5g. Thermal power stations run at operating
temperatures typically around 570°C and industrial furnaces can run from just few hundred degrees to in excess of 1,200°C. In turn the heat generated by these processes can lead to high ambient temperatures in operational areas. This is where selection of the correct device is key to ensure safe and reliable long-term operation, even under the most arduous conditions. ABB temperature transmitters have a default ambient temperature range of -40 to +85°C, which is far outside the “safe” zone for your average person without protective clothing.
KEEPING COOL Selecting the right temperature device can often involve navigating a vast array of options – is a resistance thermometer (RTD) or a thermocouple required? Which type? Should a duplex sensor be deployed for automatic redundancy or sensor drift monitoring? What accuracy class is required? What about the
Instrumentation Monthly January 2023
transmitter, is this needed, and if so should it be an integrated or remote mount design? All this is before the selection of a thermowell
is considered which is the protective sheath that protects the temperature sensor. Here there are important considerations such as the insertion length, type and material of construction and whether a stress calculation such as wake frequency is needed. Indeed, do I even need a thermowell with the introduction of non-invasive temperature sensing technology?
BEING DISRUPTIVE Whilst simple surface mounted temperature devices have been available for a long time, these have often suffered in performance due to mounting and the impact ambient conditions have on the consistency of the measurement. However true non-invasive technology is a now a reality, here the pipe itself acts as your thermowell and you can check and predict the performance of your sensor during the design stage. The ABB non-invasive design mounts on the
outside of the pipe or vessel and will measure both surface and ambient temperature simultaneously using dual RTD sensors. As they require no drilling or process shutdown, they are very simple and highly economical to install whilst still achieving the “class A” accuracy of a conventional thermowell based
temperature sensor. The low cost and ease of installation allows for multiple sensors to be used on a given application, providing better visibility of your process temperature. They can even be quickly retrofitted to provide a reference for existing thermowell sensors. Temperature sensors form a critical part of your
process operation and the importance of selecting the correct device can be overlooked. It is common to routinely fit like-for-like devices, even after repeated failures, without looking at a way to address the root cause. Sometimes it pays to step back and consider a different approach. The expertise of product managers and
value providers trained in giving the best advice can help you overcome these pitfalls and ensure you select the correct measuring technology for your application to prevent premature failures and save substantial amounts of time and money without compromising on safety and accuracy. For more information about ABB’s temperature
measurement instrumentation, please visit:
new.abb.com/products/measurement- products/temperature. For more information about non-invasive temperature measurement, visit:
new.abb.com/products/measurement- products/temperature/process-industry-head-the rmometers/tsp341-n.
aBB
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