Installation
Hardware Installation and Maintenance Manual 3
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5. Connect the validation source tube to the SCS using the 1/4 in.
stainless steel compression-type fittings provided.
6. Tighten all new fittings 1-1/4 turns with a wrench from finger tight.
a. For connections with previously swaged ferrules, thread the nut
to the previously pulled up position, then tighten slightly with a
wrench.
b. Secure tubing to appropriate structural supports as required.
7. Check all connections for gas leaks. SpectraSensors recommends
using a liquid leak detector.
8. Repeat for additional validation gases (if applicable).
Conditioning the SCS Tubing
Newly installed systems invariably have some trace contaminants and/or are
intended for measuring trace amounts of gas constituents that tend to cling to
system walls resulting erroneous readings if the constituents are not in
equilibrium with the system walls. Therefore, once the analyzer and SCS are
completely connected, the entire system (i.e., from the sample source valve to
the vent or return) should be conditioned by flowing sample gas through the
system for up to 12 hours (or until the reading stabilizes) after the system is
powered up and before actual readings are taken. Progress of the system
conditioning can be monitored via the gas concentration readings. Once the gas
constituents have reached equilibrium with the system walls, the readings
should stabilize.
Heat Trace Bundle Sleeve (Optional)
The heat trace bundle sleeve, manufactured by others, is an option for the
SpectraSensors 2-Pack analyzer. Refer to Figure A–9 on page A–13.
The following is provided if heat trace is ordered as an option for the SCS:
• A conduit hub to allow the heat trace cable to be routed to the
exterior of the SCS enclosure for power connection
• A bundle sleeve for the heat trace bundle to enter the SCS
• A 1/4 in. tube bulkhead to interconnect the tube in the bundle to the
SCS
The customer is responsible for installing the heated tube bundle according to
the heat trace bundle sleeve manufacturer’s instructions.
All electrical connections must be made in a junction box supplied
by the customer and installed external to the SCS enclosure per
site requirements.
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