Page 138 ST 700 SmartLine Pressure Transmitters User’s Manual Revision 13
12.6.1 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 52 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 52– ST 700 Basic Transmitter - Typical 3-Valve Manifold with
Blow-Down Piping
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