User`s guide

Operation
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NOTE: The controller set point is in mass flow units. There will be
a discrepancy with the measured value if a volumetric flow
meter is used. Please refer to Chapter 7 “Theory of
Thermal Desorption” for an explanation of the difference.
IS Loop Load and IS Tube Load - You must set the flow rates
manually for the Internal
Standard accessory. You must set a flow to load the sample loop
using the load loop needle valve on the TD and then set a flow to
load the sample tube using the load tube needle valve on the TD.
Leak Test - A leak test of the tube and trap is performed. For the
model 100, a tube must be placed into the instrument before the
test is called. The tube is pressurized and the pressure decay is
monitored. If a leak is detected the test will abort. An error
message will be placed into the log file.
If the test is successful, the heated valve is rotated, the trap is
pressurized and the pressure decay is monitored. If a leak is
detected the test will abort. An error message will be placed into
the log file.
Column Leak Test - A leak test of the transfer line and column
(if installed) is performed. Before running the test, cap the end of
the column or Transfer line using a septum. The system is
pressurized and the pressure decay is monitored. If a leak is
detected the test will abort. An error message will be placed into
the log file.
GC Temp Calibration - The thermocouple sensor used to
monitor the GC oven temperature for Flow Control mode can be
calibrated against the temperature reported by the GC. Select the
entry and a dialog box will open. Follow the instructions in the
dialog box to complete the calibration.
Ambient Pressure Calibration - The pressure sensor used to
monitor the ambient pressure for Flow Control mode can be
calibrated against the actual pressure measured in the lab. Select
the entry and a dialog box will open. Follow the instructions in
the dialog box to complete the calibration.