Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 28)

2 Operational Theory Model 3220
Teledyne Analytical Instruments 14
2.5.4 Micro-Fuel Cell “Class”
TAI manufactures Micro-Fuel Cells with a variety of characteristics
to give the best possible performance for any given sample conditions. A
few typical Micro-Fuel Cells are listed below with their typical use and
electrical specifications.
2.5.4.1 C LASS A-3 C ELL
The class A-3 cell is for use in applications where it is exposed
continuously to carbon dioxide concentrations between 1% and 100% in
the monitoring environment for example in a flue gas monitoring
process.
Nominal output in air is 0.20 mA, and 90% response time is 45 sec.
Expected life in flue gas is 8 months. The warranted life of the A-3 cell
is 6 months.
NOTE: In instruments using the A-3 cell, special precaution must be
taken to protect the cell from prolonged exposure to high oxygen
concentrations such as ambient air.
2.5.4.2 C LASS A-5 C ELL
The class A-5 cell is for use in applications where it is exposed
intermittently to carbon dioxide concentrations up to 100% in the sample
gas.
Nominal Output in air is 0.19 mA, and 90% response time is 45
sec. Expected life in a flue gas is 8 months and it is warranted for 6
months.
2.5.4.3 C LASS B-1 C ELL
The class B-1 cell is for use in applications where it is exposed to
less than 0.1% of carbon dioxide, and where fast response is important.
Nominal output in air is 0.50 mA, and 90% response time is 7 sec.
Expected life in air is 8 months and it is warranted for 6 months.
2.5.4.4 C LASS B-3 C ELL
The class B-3 cell is for use in applications where a slightly longer
response time is acceptable in order to have a longer cell life.
Nominal output in air is 0.30 mA, and 90% response time is 13 sec.
Expected life in air is 12 months. This cell is warranted for12 months.