Revision 14
32 August 02, 2019
2.10 Sample Conditioning System
The sample conditioning system is an optional accessory that filters the sample gas and
lowers it to a pressure suitable for use in the system. A typical sample conditioning system for
an H
2
S-only ProTech903 analyzer is seen in Figure 2-15.
Figure 2-15: Typical Sample Conditioning System
The sample conditioning system generally consists of a Coalescing filter, a pressure regulator
to regulate the sample down to 15 psig, and a valve to switch between calibration and sample
gas to allow the system to be calibrated.
The standard filter housing is a Headline housing consisting of a disposable filter element and
a sweep associated with it. Sample gas is usually taken off the bottom of the regulator to
drive the eductor. The calibration valve can be either a manual 2-way valve (as in Figure 2-
15) or an electrical solenoid valve controlled by the system.
The sample conditioning system for units with the total sulfur option has two additional
rotameters to control the flow of sample and the flow of hydrogen. The flow of hydrogen is set
significantly higher than the flow of sample to allow for complete reaction in the total sulfur
furnace.
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