HyQuest Solutions HS40C, User Manual, Page: 29 / 37

© 2022 HyQuest Solutions 29
Appendices
Figure 6 – Diagramatic view of field gas purge, single line without purge facilities.
Dual Line Connections
For long line, the effect referred to in Fig. High gas flow becomes significant and it is usual to make the connection
to the system near the orifice, so in effect there are two lines running the orifice. Hence the term dual line.
The operation of Hyquest Solutions units is described in more details in diagrams 15 and 16 of “instruction Manual for
Sherlock Pressure Sensing Units”.
Pressure Bulb or Closed System
The pressure bulb system relies on the normal = constant relationship for gases under pressure.
Using similar diagrams to before, the closed system can be illustrated follows:-
26