Chemical Engineering January 2023 - 33
and transmitter technology as in a
thermowell installation, but with a
model-based approach that digitalizes
the actual thermowell itself.
The software measures the readABB
FIGURE
3. Plotted here is the temperature trend of superheated steam on a distribution line heat exchanger
for district heating in a city in Germany to compare an invasive thermowell with non-invasive
temperature sensor mounted at the same location. Difference (non-invasive - invasive): accuracy (mean)
= +0.24°C, repeatability (standard deviation) = 0.65°C; pipe: DN125, steel; process: superheated steam
270°C nominal, 7,000 kg/h flow speed; thermowell: 3G tapered 2-mm tip
Achieving a true surface measurement
calls for something that can
factor out the potential errors that
can affect the temperature reading
and some means of being able to
simplify mounting and maintenance
of the sensors. This is now possible
with the latest generation of surfacemounted
temperature-measurement
technology. One commercial
non-invasive temperature solution,
for example, uses the same sensor
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JANUARY 2023
33
ings from dual sensors - one measuring
the temperature of the pipe
wall, the other measuring the ambient
temperature - and uses the
resulting data to calculate and output
the true surface temperature in
real time. By taking account of the
ambient conditions during the measurement,
and with a predictable
contact resistance, the transmitter
significantly increases the accuracy
and the responsiveness of the surface
measurement. When coupled
with offline models that predict the
difference between the process
temperature and the surface temperature,
this sensor eliminates the
need for a traditional measurement.
The effectiveness of this technique
compared to a conventional
thermowell has been demonstrated
in thousands of installations
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Chemical Engineering January 2023
Table of Contents for the Digital Edition of Chemical Engineering January 2023
Chemical Engineering January 2023 - Cover1
Chemical Engineering January 2023 - Cover2
Chemical Engineering January 2023 - 1
Chemical Engineering January 2023 - 2
Chemical Engineering January 2023 - 3
Chemical Engineering January 2023 - 4
Chemical Engineering January 2023 - 5
Chemical Engineering January 2023 - 6
Chemical Engineering January 2023 - 7
Chemical Engineering January 2023 - 8
Chemical Engineering January 2023 - 9
Chemical Engineering January 2023 - 10
Chemical Engineering January 2023 - 11
Chemical Engineering January 2023 - 12
Chemical Engineering January 2023 - 13
Chemical Engineering January 2023 - 14
Chemical Engineering January 2023 - 15
Chemical Engineering January 2023 - 16
Chemical Engineering January 2023 - 17
Chemical Engineering January 2023 - 18
Chemical Engineering January 2023 - 19
Chemical Engineering January 2023 - 20
Chemical Engineering January 2023 - 21
Chemical Engineering January 2023 - 22
Chemical Engineering January 2023 - 23
Chemical Engineering January 2023 - 24
Chemical Engineering January 2023 - 25
Chemical Engineering January 2023 - 26
Chemical Engineering January 2023 - 27
Chemical Engineering January 2023 - 28
Chemical Engineering January 2023 - 29
Chemical Engineering January 2023 - 30
Chemical Engineering January 2023 - 31
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Chemical Engineering January 2023 - 33
Chemical Engineering January 2023 - 34
Chemical Engineering January 2023 - 35
Chemical Engineering January 2023 - 36
Chemical Engineering January 2023 - 37
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Chemical Engineering January 2023 - 42
Chemical Engineering January 2023 - 43
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Chemical Engineering January 2023 - 47
Chemical Engineering January 2023 - 48
Chemical Engineering January 2023 - Cover3
Chemical Engineering January 2023 - Cover4
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