1A-10 / GP Transmitters 2808B
Figure 1A-9 - Horizontal Gas Run
Figure 1A-10- Vertical Gas Run
Steam Application. When measuring steam pressure, the maximum temperature of the
Transmitter's electronic circuitry must be strictly observed. Temperatures above the
specified limit (see Environmental Temperature under topic 2.1) will cause output errors
and possibly result in damage to the transmitter. One method of protecting the Transmitter
can be achieved by installing an extended, liquid-filled connecting line as shown in Figures
1A-11 and 1A-12. The liquid functions as a buffer and prevents live steam from entering the
Transmitter.
When using liquid-filled system, the connecting line must be installed in a descending step
so that the Transmitter is below the level of the process pipe tap and filling tee; this slope
will maintain the liquid in the connecting line and prevent it from being drawn into the
process pipe. Liquid-filled lines must also be properly filled and bled, and checked on a
regular basis.
A liquid-filled line is one way to isolate the Transmitter from a steam process. As an
alternate method, a steam trap may be installed in the connecting line. Several
manufacturers offer traps for this application.
Figure 1A-11 - Horizontal Steam Pipe Figure 1A-12 - Vertical Steam Pipe
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