Improved reliability
January 1st 2008 ABB's new generation of HART
transmitters, the TTH300 and the
TTF300, feature SIL2 certification
from TUV. Suitable for use in a
wide range of chemical processing
and oil and gas applications, the
TTH300 and TTF330 can be used
in LNG storage, furnace control,
surface measurement and offshore
installations.The TTH300 specifies
a 'probability of failure on demand'
of 0.01 – 0.001. This has been
achieved through the use of
redundancy. The device will
automatically change to a
redundant sensor on detection of a
failed sensor, giving improved
reliability compared with other
similar transmitters. This is
particularly important in a safety
critical application element, for
example, to shut down a process
when a set temperature is
exceeded. It also allows the
replacement of the failed sensor at
the most convenient and costeffective
time. More articles from ABB Limited: | 
