The ECH is a complete welded construction and designed for those applications where the process conditions are such that direct mounting of the instrument can’t be done. Applications are aggressive processes treatment, or when special wetted parts materials for pressure gauges are required.
There is even a seal designed for up to 4000 bars, but this type of seal is mainly used for high pressure gauges, as there are no transmitters that can withstand these high pressure.
More information:
Datasheet: EC seal – internal diaphragm threaded type
