Sample Conditioning System
Hardware Installation and Maintenance Manual 4
–5
Sample return/vent
Tunable diode laser spectroscopy is inherently sensitive to sample pressure in
the measurement cell, so the analyzers are calibrated for a range of sample
pressures. Most applications benefit from operation at low pressures instead of
high pressures. Sometimes the analyzer is designed to vent the sample to
atmosphere or an atmospheric pressure return system. Return to a flare or
other sample return must recognize the pressure limitations of the cell and also
the calibration of the analyzer.
SCSHeaters
Many analyzer systems have heated SCS enclosures. In many cases, this is
only to avoid condensation of sample components.
When starting up the heated SCS, follow the general guidelines below:
1. Energize power to the SCS and allow it to warm up to a level close
to the SCS sample temperature setpoint.
2. Start the sample flow and set to the specified flow rates.
3. Allow the system temperature to stabilize.
4. Energize power to the analyzer controller and ignore any error
messages that are seen on the display during the temperature
stabilization period.
5. Once the analyzer has been allowed to thermally stabilize, be sure
to enable Peak Tracking and any other software features as directed
in the chapter called “Operating the Analyzer” in the Firmware
Operator’s Manual.
Checking the SCS Installation
The integral SCS is factory set with the appropriate pressures, flow rates, and
enclosure temperature, as indicated in the system drawings (refer to
Appendix A). However, before operating the system for the first time, a careful
check of the installation of the entire SCS from the sample probe to the return
vent is recommended. SpectraSensors also recommends purging the transport
line to confirm there is no dust, particulates or liquids that were trapped during
installation.
ToperformSCSinstallationchecks
1. Confirm that the sample probe is correctly installed at the process
supply tap and that the sample probe isolation valve is closed.
2. Confirm that the field pressure reducing station is installed properly
at the sample probe.
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