JUMO 701150 14597 safetyM STB/STW - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 10)

1 Brief description 2014-05-01 10
1 Brief description
The safety temperature limiter (STB) and the safety temperature monitor (STW) are used to reliably detect and avert hazards
that could cause injuries, are harmful to the environment or cause destruction of production plants and produced goods, at an
early stage.
Its primary task is to reliably monitor thermal processes and switch the systems 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.
The limit value overrange is indicated by the installed LEDs K1 and K2 (red) for each channel, and the installed relay "Alarm"
switches the system to an operationally safe status (alarm range).
The high standards of DIN EN 61508 and DIN EN ISO 13849 are met by a device design, the 1oo2D structure of which ensures
reliable detection of errors and, thus, can also be used for applications according to the new Machinery Directive 2006/42/EC.
1.1 Safety temperature monitor (STW)
The STW is a safety component according to Machinery Directive, which, when activated, resets automatically if the probe
temperature has gone below / exceeded the limit value by an amount equal to the hysteresis. Possible settings: monitoring for
limit value overrange or underrange.
v Chapter 7.3.2 "Switching behavior"
1.2 Safety temperature limiter (STB)
The STB is a safety component according to Machinery Directive that is permanently locked after response. Manual reset using
the key is only possible once the probe temperature has gone below / exceeded the limit value by an amount equal to the
hysteresis. Possible settings: monitoring for limit value overrange or underrange.
v Chapter 7.3.2 "Switching behavior"
The transparent cover can be lead sealed to prevent unauthorized operation.
However, the
key remains accessible.