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3
Splitter Configurations
Restrictor id and length
1 Run the Effluent Splitter Calculator and enter the following information.
2 Choose the id tubing that gives a length closest to (and at least) 0.3 m for
32
The calculator provides a list of possible restrictors.
•
Column flow. Use the ChemStation, GC, Flow Calculator, or Method
Translation Software to determine the column flow in mL/min (with the
column outlet at 3.8 psig) at the initial oven temperature.
•
Initial oven temperature. This is the temperature setpoint for an
isothermal method or the initial temperature for a programmed method.
•
Carrier gas type. Enter Helium, Nitrogen, or Argon.
•
Detector operating pressures (psia). The operating pressure must be in
absolute units. Most detectors (FID, TCD, ECD, NPD, and FPD) operate
at atmospheric pressure (14.696 psia). Exceptions are the MSD (0 psia)
and AED (16.196 psia).
•
Flow Ratios, Detector 2 to Detector 1 and Detector 3 to Detector 1.
These are the desired split ratios among the detectors. Usually this
number is 1, meaning the effluent divides equally among the detectors.
This can be adjusted to higher values, but should normally not exceed
five.
•
Splitter (column outlet) pressure (psig). This is the desired pressure at
which the splitter (and thus the end of the column) will operate. It can be
set between 2 and 4 psig, but is usually set to 3.8 psig. This number can
be varied to obtain an acceptable combination of restrictors that will
have sufficient flow velocity to give good peak shapes.
most detectors and 0.8 m for MSDs. The green fields with tubing diameters
in mm can be edited if you have other sizes of deactivated tubing available.
Installation and Operation Guide
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