Chemical Engineering February 2023 - 36

normally switched off in SIL mode.
The safety controller then takes the
field device out of SIL mode via
the HART protocol and temporarily
switches it to simulation mode,
comparing the setpoint and actual
value of the 4-20-mA signal.
Finally, the device is automatically
switched back to SIL mode, restarted
and the HART channel is
deactivated again. The results of
the test are documented.
Automatic partial test
However, this is only possible with
devices that allow HART commands
in SIL mode. To prevent
HART communication from being
compromised during the automatic
partial test, the SSPS saves
the device configuration and detects
deviations. This eliminates a
major criticism of HART communication
with SIL devices: in contrast
to the classic setup, where the
HART signal runs via a multiplexer
(for example, connected to an
asset management system), communication
only runs between the
SSPS and the field device. While
hacker attacks cannot be ruled out
via asset management stations,
this risk is virtually eliminated with
safety controllers.
Secure data transmission and
storage are also important. Secure
Bluetooth connections for communication
with devices are now available
(Figure 3).
These measures are also part
of the " Secure Instrumentation "
concept. In addition, for Coriolis
instruments, for example, there is
a housing concept that prevents
medium from escaping
through
the transmitter housing even in the
event of sensor damage.
Final remarks
Safety in the instrumentation of
process plants has many facets
and goes far beyond functional
safety. Systematic errors represent
a significant influencing variable in
the planning, operation and maintenance
of measuring points, and
they can be avoided through training,
video instructions as well as
automated test procedures.
n
Edited by Gerald Ondrey
References
1. https://krohne.com/mydevice-de/icv-videos.
2. https://academy-online.krohne.com/de.
Author
Lothar Gellrich is vice president
Operational Marketing at Krohne
Messtechnik
GmbH
Before
(LudwigKrohne-Straße
5, 47058 Duisburg,
Germany; Phone: +49-203301-4494;
Email:
krohne.com).
l.gellrich@
assuming
this position in 2019, he was head
of marketing communications at
Krohne since 2009. Prior to this,
he worked at ABB in several product-management positions.
From 1996 to 2001, he was a commissioning
engineer for steel-manufacturing plants at SMS Demag.
Gellrich holds an engineering Diplom in electronics and
automation technology from the Fachhochschule Osnabrück,
and a masters degree in electronics from
Middlesex University London.
Call the
Solids Mixing
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Vacuum Drying
Dryers & Complete Systems
for all your solids processing
Experts
Applications:
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Polymers ∙ Powdered Metals
Proteins ∙ Resins ∙ Vitamins
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For details visit adlinks.chemengonline.com/84644-17
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sales@pauloabbe.com
For details visit adlinks.chemengonline.com/84644-16
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
FEBRUARY 2023
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Chemical Engineering February 2023

Table of Contents for the Digital Edition of Chemical Engineering February 2023

Chemical Engineering February 2023 - Cover1
Chemical Engineering February 2023 - Cover2
Chemical Engineering February 2023 - 1
Chemical Engineering February 2023 - 2
Chemical Engineering February 2023 - 3
Chemical Engineering February 2023 - 4
Chemical Engineering February 2023 - 5
Chemical Engineering February 2023 - 6
Chemical Engineering February 2023 - 7
Chemical Engineering February 2023 - 8
Chemical Engineering February 2023 - 9
Chemical Engineering February 2023 - 10
Chemical Engineering February 2023 - 11
Chemical Engineering February 2023 - 12
Chemical Engineering February 2023 - 13
Chemical Engineering February 2023 - 14
Chemical Engineering February 2023 - 15
Chemical Engineering February 2023 - 16
Chemical Engineering February 2023 - 17
Chemical Engineering February 2023 - 18
Chemical Engineering February 2023 - 19
Chemical Engineering February 2023 - 20
Chemical Engineering February 2023 - 21
Chemical Engineering February 2023 - 22
Chemical Engineering February 2023 - 23
Chemical Engineering February 2023 - 24
Chemical Engineering February 2023 - 25
Chemical Engineering February 2023 - 26
Chemical Engineering February 2023 - 27
Chemical Engineering February 2023 - 28
Chemical Engineering February 2023 - 29
Chemical Engineering February 2023 - 30
Chemical Engineering February 2023 - 31
Chemical Engineering February 2023 - 32
Chemical Engineering February 2023 - 33
Chemical Engineering February 2023 - 34
Chemical Engineering February 2023 - 35
Chemical Engineering February 2023 - 36
Chemical Engineering February 2023 - 37
Chemical Engineering February 2023 - 38
Chemical Engineering February 2023 - 39
Chemical Engineering February 2023 - 40
Chemical Engineering February 2023 - 41
Chemical Engineering February 2023 - 42
Chemical Engineering February 2023 - 43
Chemical Engineering February 2023 - 44
Chemical Engineering February 2023 - 45
Chemical Engineering February 2023 - 46
Chemical Engineering February 2023 - 47
Chemical Engineering February 2023 - 48
Chemical Engineering February 2023 - Cover3
Chemical Engineering February 2023 - Cover4
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