Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 29)

Oxygen Monitor System 2 Operational Theory
Teledyne Analytical Instruments 15
2.5.4.5 C LASS C-3 C ELL
The class C-3 cell is for use in applications where it is exposed to
less than 0.1% of carbon dioxide, and where a longer response time is
acceptable in order to have a longer cell life.
Nominal output in air is 0.20 mA, and 90% response time is 30 sec.
Expected life in air is 18 months and is warranted for 12 months.
2.5.4.6 H YDROGEN AND / OR H ELIUM S ERVICE
If the sample gas contains 10% or more hydrogen and/or helium,
“clamp” cells are used. These Micro-fuel Cells are identifed by the suffix -
C added to the cell class number.