Thermal Conductivity Analyzer Part II: Analysis Unit
Teledyne Analytical Instruments Part II: 2-52-8 ZERO Gas
For the ZERO gas, a supply of the background gas, usually containing
none of the impurity, is required to zero the analyzer during calibration. For
suppressed zero ranges the zero gas must contain the low-end concentration
of the impurity.
NOTE:Because most cylinder gases are between 99.95 and 99.98%
pure, it is highly recommended that the same cylinder of gas
be used for both REFERENCE and ZERO gas.
NOTE:It is essential to the accuracy of the analyzer that the purity of
the zero gas be known. Otherwise, when the zero control is
adjusted during zero standardization, the reading will indicate
the impurity content of the zero gas, rather than zero.
2-9 SPAN Gas
For the SPAN gas, a supply of the background gas containing 70-
100 % of the component of interest is required as a minimum.
Note: If your analyzer range is set for inverting output, your zero gas
will be at 100% of the range interest, and span will be 70 to
100% of the low end range.
If linearization is required, intermediate concentrations of the target gas
in the background gas may be necessary. From one to nine separate span
gases may be used, depending on the desired precision of the linearization.
See chapter 4, Operation.
2-10 Electrical Connector Panel
All electrical connections are made on the internal Electrical Connector
Panel, inside the explosion-proof enclosure, illustrated in Figure 3-3. The
signals are described in the following paragraphs. Wire size and length are
given in the Drawings section at the back of this manual. To access the
Panel, remove the explosion-proof cover as described in chapter 5, Mainte-
nance. NEVER OPEN THE COVER IN A HAZARDOUS ATMO-
SPHERE. THE AREA MUST BE DECLARED TEMPORARILY SAFE
BY THE PROPER AUTHORITY FIRST.