Transmitter Low Pressure (LP) side to tank wall upper
flange, OR
High Pressure (HP) side to tank wall upper flange.
3.5 Piping the ST 800 Transmitter
3.5.1 Piping Arrangements
Piping arrangements vary depending upon process measurement requirements and the transmitter model.
For example, a differential pressure transmitter comes with double-ended process heads with ¼-inch NPT
connections, which can be modified to accept ½-inch NPT through optional flange adapters. Gauge
pressure transmitters are available with various connections for direct mounting to a process pipe.
A ½-inch, schedule 80, steel pipe is commonly used for transmitter integration into a process system.
Many piping arrangements use a three-valve manifold to connect the process piping to the transmitter. A
manifold makes it easy to install and remove or re-zero a transmitter without interrupting the process. A
manifold also accommodates the installation of blow-down valves to clear debris from pressure lines.
Figure 12 represents a typical piping arrangement using a three-valve manifold and blow-down lines for a
differential pressure transmitter being used to measure flow.
Figure 12 – Typical 3-Valve Manifold with Blow-Down Piping
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