June 11, 2015, 715004754 Rev. A
Page 29
1.3.5.3 Solenoid valve
During normal operation, the solenoid valve remains open. Fluid that passes through
the sample side of the flow cell flows through the solenoid valve and out through the
outlet tubing (blue) to the waste reservoir.
When you purge the detector, the solenoid valve closes causing fluid passing through
the sample side of the flow cell to flow out through the reference side of the flow cell,
through the purge outlet tubing (blue).
1.3.5.4 Pressure relief valve
During normal operation, the pressure relief valve remains closed. It opens when the
pressure for the flow cell, whose maximum pressure rating is 690kPa (6.89 bar, 100
psi), gets too high to withstand. This protects the flow cell from exceeding the
maximum pressure rating. The pressure rating of the relief valve is 103.4 kPa (1 bar,
15 psi).
During purging, fluid moving through the sample and reference sides of the flow cell
goes out through the pressure relief valve, to the waste reservoir. The figures on
page 26 and page 27 indicate the flow paths during normal operation and during a
purge. The following table provides the inner diameters of the sample and fluid lines.
1.3.5.5 Recycle valve
During normal operation the recycle valve remains closed. It opens only when you
specify recycling from the front panel or by means of a rear panel external event. A
closed valve diverts solvent to the second port to which you can plumb fluid lines and
thus return mobile phase to the main solvent reservoir during equilibration or at other
times when the unit is not performing an analysis.
1.3.5.6 Insulated sample inlet tubing
To ensure good thermal isolation, use insulated tubing to connect the
temperature-controlled column to the detector’s sample inlet.
Table 1–1: Fluid line diameters:
Fluidic line Inner diameter (inches)
Sample in 0.009
Sample out 0.040
Reference in 0.020
Reference out 0.040
Recycle in 0.040
Recycle out 0.040
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