User manual

• Please note that connection or operational faults lie outside of our circle of
influence. Understandably, we are not liable for damages caused by these
reasons.
• If a component is not working, it must be returned with an exact description of
the fault (specify what is not working... because only an exact description of
the fault can enable a proper repair!), the related construction manual as well
as without the casing. Understandably, we need to charge extra for
assembling and dismantling work of the casing that require a lot of time.
Components already mounted cannot be exchanged. In installations and
when working with mains voltage, please always adhere to the VDE-
guidelines.
• Devices that are operated at a voltage > 35 V may be connected only by an
expert.
• In each case it must be checked, whether the component is suitable and can
be used for the respective application and location.
• The commissioning may be done only when the circuit has been installed
properly insulated in a casing.
• If measurements are unavoidable with the casing open, then an isolating
transformer must be interposed, or, as already mentioned, the power must be
supplied through a suitable mains unit (that conforms to the safety
regulations).
• All wiring work must be done in dead state.
Product description
Many temperature switches have a disadvantage. Even when the sensor cable is
broken or short-circuited by a defect, the heating continues to remain on, which
can lead to overheating and considerable damages.
This temperature switch with integrated sensor monitoring (short-circuit/break)
switches a relay, which switches on a heater fan, frost monitor or a similar device
when the set temperature is fallen short.
The switching temperature can be set by means of a trimming potentiometer.
Four LED’s indicate the switching states.
This article was checked according to the EG-guideline 89/336/EWG (EMVG
dated 09.11.1992, Electromagnetic Compatibility) and conforms to the legal
requirements.
Description of circuit
As far as the automatic temperature switches are concerned, mostly the so-
called two-point regulators are taken as the corresponding solution. These
regulators are a circuit, which simply compare a specified reference value (the
desired temperature) with the prevailing actual value.