2808B GP Transmitters / 1A-9
1A.5 PRESSURE MEASUREMENT APPLICATIONS
2808-XXB Transmitters measure the pressure of a process medium flowing through a pipe
or contained in a tank. A discussion of some basic applications follows:
Figure 1A-7 - Process Pipe Mounting
Figure 1A-8 - Pipe Tap Connection
Liquid Application. When measuring pressurized liquids in a process pipe, the
Transmitter may be attached to the process line using a valve fixture as shown in Figure
1A-7. However, if temperature or vibration characteristics at the site exceed the specified
limits of the Transmitter, the Transmitter should be placed in a more hospitable location
with a connection made through appropriate pressure tubing as shown in Figure 1A-8. Both
arrangements should include shutoff and drain valves to purge connection lines and the
Transmitter.
Gas Application. The gas industry typically measures differential pressure, static
pressure and other variables associated with gas flow. A gas installation could use a GP
Transmitter to monitor the static pressure and a DP Transmitter to measure the
differential pressure as shown below.
Figure 1A-9 shows the Transmitters connected to a horizontal pipe. For these installations
both Transmitters are physically mounted above the connecting line to allow internal
moisture to drain away.
In Figure 1A-10, the gas flow is in a downward direction to minimize the accumulation of
moisture above the orifice plate. Otherwise, both Transmitters are mounted and connected
in the same manner as described for horizontal pipes.
Gas installations should include shutoffs and union fittings for both transmitters so that
they can be disconnected from the line without disrupting the process.
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