Ametek Thermox WDG Insitu User Manual page 162

C-4 | Thermox Series 2000 WDG Insitu Analyzer
 Skip this section if you don't measure combustibles.
NOTE
In addition, both of the combustibles current outputs can be used in a
modulation scheme using the following:
VEXT3+
VEXT3-
VEXT4+
VEXT4-