SS2100i-1 Gas Analyzer
3–4 4900002224 rev. E 12-18-20
Connecting the Solenoid Valves
Differential systems require solenoid valves to switch between process flow and
flow that has been scrubbed of the analyte. The solenoids switch the flow either
directly, as shown in Figure 3–1 on page 3–5, or via instrument air driving
pneumatic valves, as shown in Figure 3–2 on page 3–6, Figure 3–3 on page
3–7 and Figure 3–4 on page 3–8. Refer to “Differential TDLAS” on page 1-8.
For systems performing differential measurements that do not have a factory
installed sample system, the cables connecting the solenoid valve(s) to the
electronics must be installed. All work should be performed by personnel
qualified in electrical installation.
Figure 3–1 on page 3–5 is a schematic of a typical basic differential setup for
installations where no instrument air is available to drive pneumatic valves. A
more preferable setup is shown in Figure 3–2 on page 3–6 where only one
solenoid is required in favor of more reliable pneumatic valves. Systems set up
for autovalidation with one gas require two solenoids, as shown in Figure 3–3
All cover screws must always be tightened completely and may be
replaced only with screws of the same type (ISO 4762/DIN 912)
and material (Stainless Steel Grade A2-70). Ultimate Racing UR
0905 Copper Anti-Seize Lubricant or equivalent on cover screw
threads to prevent galling unless glands are used.
Solenoid valves are used on differential analyzer systems only,
not on non-differential systems. Contact Service for any questions
or clarifications. Refer to “Service Contact” on page B-27.
Pay special attention to systems measuring especially reactive or
adherent species. Because of the reactive or adherent nature of
such species, accurate measurement of their concentration may
be compromised somewhat by adsorption, desorption or reaction
with wetted surfaces. Special coatings are available to minimize
these effects.
Use an appropriate sample conditioning system that has been
specifically designed to deliver a sample stream that is
representative of the process stream at the time of sampling with
the system to assure that the analyzer is receiving sample gas
that can be correctly measured.
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