The construction and assembly of data acquisition for the monitoring device must be manufactured according to the operating instructions.
In order to achieve a sufficient security for the data acquisition a â€œhot spotï¾¿ must be created according to drawing (picture 1). The data acquisition must be connected to this â€œhot spotï¾¿ by using a temperature sensor.
The cable and the limiter sensor is coupled with a highly conductive heat-resistant foil. (e.g. ALK 150)
To ensure that the temperature which is located at the hot spot is definitely higher than the heating cable in locations with poor thermal coupling, this hot spot must be at least three times the length of the sensor "T".(see testing protocol).
The construction of the hot spot has to be documented (possibly also with photo) and add to the heating circuit documentation and also to the explosion protection document.
The monitoring device (temperature limiter) is set at temperature class T6, T5 to -5K or less according to the EN 60079 specified temperature limit. For the temperature class T3, a distance of at least 10K to limit temperature must be maintained.
The manufacturer and type as well as the set point of the monitoring device used must be documented in the testing protocol of the heating circuit. Create a serial number for each circuit that is included on the label.