Teledyne GC-Pro/TCD - Gas Chromatograph - Manual (Page 75)

GC-Pro TCD Operation
Teledyne Analytical Instruments 61
A similar screen displays if Group 5-9 is selected.
A lit green LED next to a group indicates the group is enabled
(selected) for calibration. An unlit green LED means the group has not
been selected and will not be calibrated. Touching on the group’s LED
will toggle the LED between lit (enabled) and unlit (deselected).
The SPAN value inputs for each selected group in any of the three
units PPB, PPM or Percent can be entered by touching the respective
yellow LED next to the correct unit input box. A numerical keyboard
will pop up allowing the user to input the known composition of the