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The devices in the ATH series are available as temperature controllers TR, temperature monitors TW, safety temperature monitors STW (STB) and safety temperature limiters STB. In the event of a fault, the STB puts the monitored system into a safe operating state. Surface-mounted thermostats work on the principle of liquid expansion; a microswitch serves as the electrical switching element.Self-monitoring for the safety temperature limiter STB and safety temperature monitor STW (STB).If the measuring system is destroyed, i.e. if the expansion liquid escapes, the pressure in the diaphragm of the STB and STW (STB) drops and permanently opens the circuit. Unlocking is no longer possible. If the sensor cools down to a temperature below approx. -20°C, the circuit is also opened; if the temperature rises above approx. -20°C, the STB must first be unlocked manually using the restart button. The STW (STB) is restarted automatically.Restart interlock for the safety temperature limiter STBIf the temperature at the temperature sensor exceeds the set limit value, the circuit is opened and the microswitch is mechanically locked. Once the temperature falls below the danger temperature by approx. 10% of the scale range (approx. 15% for limit value setting > +350°C), the microswitch can be unlocked manually.- Protection class IP 54.- Immersion pipe with DN 15 (1/2") connection- Control range: 0...100°C
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