The UST construction is designed for those applications where the existing threaded process connection is too small to use a flush diaphragm seal. The UST consists of an upper and lower housing, the upper is the actual seal part with a diaphragm size that allows for measurement of relatively low ranges (200 mbar 2 seals attached (dP); 800 mbar single seal attached). The lower housing creates the transition from the diaphragm size to the actual small process connection. UST is typically used in combination with (differential) pressure transmitters for applications such as level, flow and pressure measurement; also the UST is often combined with pressure gauges.