Teledyne 2000A-EU - General purpose thermal conductivity analyzer - Manual (Page 15)

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Thermal Conductivity Analyzer Introduction 1
Teledyne Analytical Instruments
Note: If you require highly accurate Auto-Cal timing, use external
Auto-Cal control where possible. The internal clock in the
Model 2000 is accurate to 2-3 %. Accordingly, internally sched-
uled calibrations can vary 2-3 % per day.
1.8 Gas Connections
The gas connectors are on the bottom of the Model 2000A chassis
near the front panel. There are no gas control valves inside the main chas-
sis. Electronic input/output ports are provided on the rear panel for the
operation of solenoid valves under the complete control of the Model 2000
electronics. See section 3.3.
A sample system must be provided for introduction of zero and span
gas, as well as sample gas, into the sample path, and for controlling the
flowrates through the sample and reference paths of the analyzer. Appropri-
ate pressure reducing regulators must be installed at all gas supply sources.
Gas Connector-and-Control Panels for specific applications are avail-
able as extra cost additions. These panels are usually designed around a
standard manifold that attaches to the Model 2000 series analyzer below
the front panel.
For those customers wishing to incorporate their own sample controls,
the recommended system piping schematic is included among the drawings
at the rear of the manual.