The usage of an M12 coupler connector at the connection head of a thermometer, rather than standard cable outlet, enables quick and safe connection. In the hygienic, food and pharmaceutical industries this type of design is also being demanded a lot more frequently.
In practice, plant manufacturers prefer to depend on pre-assembled cables with fitted connectors, since this completely eliminates having to fix the single strands in to the thermometer head. The time required for assembly and for disassembly during calibration or when replacing the instrument can thus be reduced considerably. Another advantage is that, in the event of changing out any instrument, incorrect re-wiring can be avoided.
In general, additionally it is worth noting that, to ensure the operational safety of plants and for his or her maintenance and servicing, it really is imperative that equipment is simple to completely clean and that moisture protection reaches a maximum. Dirty apply for all process components, also outside the process (in the ?splash zone?).
Note
WIKA has adapted the full-metal M12 coupler connector, familiar from the TR21 (TR21-A, TR21-B, TR21-C) product line, to the cable outlet for thermometers with connection head and thus enabled a simple and reliable reference to a 4-pin M12 connection cable. The high-quality sealing concept of this connector in addition has shown in the extreme requirements of autoclavable sensors. As well as the already established TR21 miniature resistance thermometers, which were designed for the high IP requirements of sanitary applications, WIKA now offers thermometer products with connection heads ? models TR20, TR22 (TR22-A, TR22-B), TR25 ? with a hygienic M12 coupler connector for the hygienic, food and pharmaceutical industries.