Teledyne GC-Pro/TCD - Gas Chromatograph - Manual (Page 76)

Operation GC-Pro TCD
Teledyne Analytical Instruments 62
span gas. After inputting the value, press ENTER on the pop up
keyboard to input the value into the box.
Only inputs with the glowing yellow LED will be affected. When
user touches the ENTER button the inputs with the glowing yellow LED
will be saved following confirmation on the pop up screen.
To initiate the calibration, touch the “SPAN BEGIN” button and
then “OK” on the next pop up screen to calibrate the analyzer for the
selected groups.
Once calibration is complete, the display will revert to the HOME
screen. The same procedure can be followed for calibrating groups 5-9.
4.5.10.2 A LT S PAN
If a particular compound of interest is not available or not contained
in the span gas, another compound existing in the span gas can be used
for the alternate calibration. This requires assigning a factor that results
in a best fit approximation to the calibration standard normally required
for that group. These factors must be determined by the factory since
entering an incorrect value will seriously affect the measurement
capability of the instrument for that group. For this reason, TAI
recommends contacting customer service before using the Alt Span
function.
Touch the ALT SPAN listing on the Calibration screen to enter the
Alt Span function. The following screen is displayed: