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4040 - Methane / Nonmethane analyzer - Teledyne Analytical ...

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Installation3.3.2 Gas ConnectionsThe <strong>analyzer</strong> gas connection diagram identifies the various gasconnection points as to function and location. Figure 3-1 shows the gasconnection points for instruments with AutoCal module.SPAN GASFLOW RESTRICTOROPTIONALSAMPLE-SPANMANIFOLDFigure 3-1: Gas ConnectionsGas connections to the instrument are made at the 1/8”or 1/4”stainless steel tube fittings provided on the rear panel. Note that thePurge and Sensor Vent fittings are 1/4” while all other gas connectionsare 1/8”.It is recommended that all gas tubing leading to the connections onthe back of the <strong>analyzer</strong> be of the coiled type. This will facilitate slidingthe unit out of the case without disconnecting the gas supply to the<strong>analyzer</strong>.Before tubing is connected to the system, it must be decontaminatedto rid it of hydrocarbon deposits. Using a small torch, heat each lengthof tubing, while passing nitrogen through it, until it glows red. Begin atthe nitrogen source end and proceed down the length of the tube,“chasing” the red glow (and hydrocarbon deposits) down to the openend of the tube. Cap tubing while not in use with suitable noncontaminatingcaps.<strong>Teledyne</strong> <strong>Analytical</strong> Instruments 27

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