Siemens GC..M.. Manual de instalación descargar pdf (Pagina 29)

Sampling System Installation, Continued

Figure 2-4. Typical Installed Sample Probe

Returning Samples to the Process Stream

Refer to the Application Drawing Package, Sampling System sheet and Block Diagram Utility

Connections sheet.

If the sample stream is a gas and is to be released to the atmosphere, install a vent line outside the

analyzer house to at least 8 ft. (2.4 m) above the ground. The exhaust end should be curved down, or a

vent cap added for weather protection. If the sample gas is to be returned to a pressurized line, a

minimum pollution valve is required in the sampling system. The return line should have only a very low

pressure (0 to 20 psig [0 to 138 kPa].) Install a check valve to prevent backflow.

When returning a gas sample that can condense, slope it downward to a liquid drain or return it to the

process stream using heat tracing to prevent any condensation. For details on installing heat tracing,

refer to the "Sampling System" description in this section.

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Siemens GC..M.. Manual de instalación Pagina 29