Agilent Technologies G3183B, Installation And Operation Manual

Page: 43 / 56

Operation
4
Installation and Operation Guide 43
The calculator lists the lengths required for the different sizes of uncoated,
deactivated, fused-silica restrictor tubing available. Choose the id tubing that
gives the shortest length of at least 0.3 m for most detectors and 0.8 m for
MSDs. In this case 0.18-mm id is the choice for the MSD and the FPD. A length
of 1.236 m is calculated for the MSD restrictor and 0.456 m for the FPD
restrictor. For the ECD, a 0.434-m length of 0.1-mm id tubing is calculated.
Table 4 on page 33 shows that in all cases the flow is higher than or equal to
the suggested minimum flow for the tubing diameter and gas type.
Calculate column flow
To find the makeup flow at 280 °C, first find the column flow at 280 °C. The
Flow Calculator software (
Figure 19 ) requires that the output pressure be
entered in psia. Therefore 18.496 psia (3.8 psig) is entered.
Figure 19 Column flow calculation