Safety temperature monitor

This article is not adequately provided with supporting documents (for example individual proofs ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

Not a single receipt is given.

A safety temperature monitor (STW) is a thermostat that interrupts the supply of heat when a previously set maximum permissible temperature is reached (temperature limit value). The heat supply can be interrupted by closing a valve or by interrupting the power supply to the pump in the corresponding hydraulic circuit. After falling below a hysteresis to the temperature limit value, the STW releases the heat supply again, in contrast to a safety temperature limiter (STB), which has to be unlocked manually.

The setting option of the temperature limit value of a STW is protected against unintentional adjustment, e.g. B. by a secured with screw cover. The STW also differs from a normal thermostat in that it only becomes effective if the actual temperature controller of the heating system fails. The highest switching point of the temperature controller must be a certain distance from the switching point of the safety temperature monitor.

A STW circuit is useful. a. in the collector circuit of solar thermal systems . Components such as pumps and valves must be protected from overheating (approx. 120 ° C). In contrast to a safety temperature limiter (STB), the STW releases the solar circuit again so that as little solar heat as possible remains unused and the collector does not go into stagnation unnecessarily until the problem is identified and eliminated.

Individual evidence

1. ↑ Balow, Jörg, 1968-: Systems of building automation, a manual for planning, building, using . 2nd Edition. cci Dialog GmbH, Karlsruhe 2016, ISBN 978-3-922420-32-3 .