JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 11)

1 Brief description
5 2013-04-01
The device concept also meets the stringent requirements of DIN EN 61508 and DIN EN 13849. The 1oo2D structure ensures
reliable detection of errors, meaning that the device concept can also be used for applications subject to the new Machinery
Directive 2006/42/EC.
The measured value at the analog input can be recorded by various probes or standard signals.
The rise of the measured value above the limit value is indicated by the installed LEDs K1 and K2 (red) for each channel, and
the installed alarm relay output switches the system to safe operating status
(alarm range).
1.1 Safety temperature monitor (STW)
The STW is a safety-component device according to the Machinery Directive which, when activated, resets automatically if the
sensor temperature has fallen below or risen above the set limit value by an amount equal to the switching differential. Possible
settings: monitoring for limit value overrange or underrange.
v
Chapter 8.3.2 "Switching behavior"
1.2 Safety temperature limiter (STB)
The STB is a safety-component device according to the Machinery Directive which is permanently locked after activation.
Manual reset using the
key is only possible once the probe temperature has fallen below / has exceeded the limit value by
the amount of the switching differential. Possible settings: monitoring for limit value overrange or underrange.
v
Chapter 8.3.2 "Switching behavior"
The transparent, sealable protective cover prevents unauthorized operation.
The key is still accessible.