Teledyne 4040 - Methane / Nonmethane analyzer - Manual (Page 27)

Installation
Teledyne Analytical Instruments 27
3.3.2 Gas Connections
The analyzer gas connection diagram identifies the various gas
connection points as to function and location. Figure 3-1 shows the gas
connection points for instruments with AutoCal module.
OPTIONAL
SAMPLE-SPAN
MANIFOLD SPAN GAS
FLOW RESTRICTOR
Figure 3-1: Gas Connections
Gas connections to the instrument are made at the 1/8”or 1/4”
stainless steel tube fittings provided on the rear panel. Note that the
Purge and Sensor Vent fittings are 1/4” while all other gas connections
are 1/8”.
It is recommended that all gas tubing leading to the connections on
the back of the analyzer be of the coiled type. This will facilitate sliding
the unit out of the case without disconnecting the gas supply to the
analyzer.
Before tubing is connected to the system, it must be decontaminated
to rid it of hydrocarbon deposits. Using a small torch, heat each length
of tubing, while passing nitrogen through it, until it glows red. Begin at
the nitrogen source end and proceed down the length of the tube,
“chasing” the red glow (and hydrocarbon deposits) down to the open
end of the tube. Cap tubing while not in use with suitable non-
contaminating caps.