Scion Instruments
Scion Instruments Natgas C Analyzer +He/H
2
Channel Reference Manual Page: 6
TUNING THE NATGAS C ANALYZER
Tuning is only necessary when new columns have to be installed or by
malfunctioning of the GC.
Connect the columns according the flow schematics given in Section 6 and
adjust the pressures (if necessary) at an oven temperature of 45°C.
Take very good care not to create any dead volume!
• Set the injection valve (V1) and the column selection valve (V2) in the (-)
position.
• While measuring the flow out the exit of the middle TCD, adjust the rear
EFC-24 flow until there is a flow of 33 ml/min.
• Set the middle EFC-24 until a flow of 27 ml/min is coming out of the vent 1.
• Set the DEFC-13 to give a flow of 30 ml/min out of the reference exit of the
TCD.
• Set the front EFC-25 pressure at 20 psi and at a split ratio of 1:200.
• Program the method as given in the OPERATION section.
• Check all connections for leakage.
After stabilization of the TCD and FID signals the system is ready for
analyses.
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