JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 36)

6 Safety Manual
2013-04-01 30
6 Safety Manual
6.1 Brief description
The safety temperature limiter
(STB) and safety temperature monitor (STW) enable early and reliable detection of risks which
could potentially result in personal injuries, environmental damage, or destruction of the production plant and production mate-
rials.
Its task is to reliably monitor process variables such as temperature or pressure and to switch the plants to an operationally
safe status in the event of malfunctions.
The measured value at the analog input can be recorded by various probes or standard signals.
Even when using double sensors (1oo2) only one physical measuring point is monitored at the measuring point.
Limit value exceedance is indicated by the installed LEDs K1 and K2 (red) for each channel, and the installed alarm relay output
switches the plant to safe operating status
(alarm range).
The SIL3 requirements of DIN EN 61508 and PL d DIN EN ISO 13849 are met by a device concept that has a 1oo2D structure
which ensures reliable detection of errors.
The JUMO safety
M STB/STW Ex has been tested in accordance with ATEX directive 94/9/EC as associated apparatus with an
intrinsically safe input.
It meets the requirements of the following identification markings:
The JUMO safety
M STB/STW Ex has also been certified according to DIN EN 50495 and DIN EN 13463-6 for use in monitoring
ignition sources pursuant to the ATEX directive.