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3
Splitter Configurations
Typical Configurations
The important parameters when setting up a splitter are the lengths and
diameters of the restrictor tubes that go to the three detectors. The
dimensions of the restrictors are chosen to give the desired flow (split) ratio,
flow to the detector, and to minimize peak broadening.
The splitter restrictors are chosen based on:
• The range of column flows that will be used with the method
• The operating pressure of the three detectors
• The flow rate requirements of the three detectors
Table 2
flows. All calculations assume helium as the carrier gas and a splitter pressure
setting of 3.8 psig.
Table 2
Splitting configurations
Config
Detector type
uration
*
1
MSD-D
atm
‡
2
MSD-T
atm
3
MSD-D
atm
4
MSD-T
atm
5
MSD-D
atm
6
MSD-T
atm
7
MSD-D
atm
8
MSD-T
atm
* MSD-D MSD with diffusion pump or standard turbo pump (2 mL/min flow capability)
† atm Atmospheric pressure detectors such as FID, TCD, ECD, FPD, and NPD
‡ MSD-T MSD with performance turbo pump (4 mL/min flow capability)
26
lists typical splitting configurations.
Flow ratio
Det2 to
Det1
†
atm
1
atm
1
atm
1
atm
1
atm
2
atm
2
atm
0.5
atm
0.5
Restrictor 1
Det3 to
id,
length,
Det1
mm
m
1
0.18
2.89
1
0.18
1.44
0.1
0.18
2.89
0.1
0.18
1.44
2
0.18
2.89
2
0.18
1.44
0.5
0.18
2.89
0.5
0.18
1.44
Table 3
shows the resulting gas
Restrictor 2
id,
length,
id,
mm
m
mm
0.18
1.06
0.18
0.18
0.53
0.18
0.18
1.06
0.10
0.18
0.53
0.10
0.18
0.53
0.18
0.20
0.41
0.20
0.18
2.13
0.18
0.18
1.06
0.18
Installation and Operation Guide
Restrictor 3
length,
m
1.06
0.53
1.01
0.51
0.53
0.41
2.13
1.06
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