240634 / 8146662300
2019-05-27·BA00·III·en·04
Function and Device Design
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Safety temperature monitor and limiter
Series 8146/5041-STW, 8146/5041-STB,
8146/5051-STW+STB
4
Function and Device Design
4.1
Function
Application range
The Series 8146/5041-STW, 8146/5041-STB and 8146/5051-STW+STB safety
temperature monitor and limiters are approved for use in hazardous areas of Zones 1, 2,
21 and 22 and in safe areas.
Mode of operation
The safety temperature monitor and limiter operate with a fluid-filled measuring system.
The change-over contact is activated due to temperature related volume changes.
If the measuring system leaks, the safety temperature monitor switches off and
prevents reconnection.
Safety temperature monitor:
If the temperature of the sensor exceeds the set value, the controller switches off.
If the temperature falls below the set value, the controller switches on automatically.
Safety temperature limiter:
If the temperature of the sensor exceeds the set value, the limiter switches off
permanently. Once the temperature has dropped, the safety temperature limiter
can be unlocked manually.
DANGER
Explosion hazard due to improper use!
Non-compliance results in severe or fatal injuries.
• Use the device only in accordance with the operating conditions
described in these operating instructions.
• Use the device only for the intended purpose specified in these
operating instructions.
