Teledyne 3000PB - Bulkhead mount percent oxygen analyzer - Manual (Page 62)

5 Maintenance Model 3000PB
5-4
Teledyne Analytical Instruments
Version Self—Test
Cell Output: ###
μμμμμA
The “good” reading depends on the class of cell your analyzer is
using.
Although the B-1 cell is standard in the 3000PB, check Specific
Model Information in the Front Matter in this manual for the class of
cell you purchased. Then check Table 5-1, the Cell Indices table below,
and do the prescribed calculations. If the resulting value is below the Cell
Output reading, replace the cell.
To find out if the cell is too weak:
1. Flow span gas through the analyzer, and allow time to purge.
2. With span gas flowing, read the raw output of the cell from the
System function display.
3. Divide the raw output reading by the percent oxygen
concentration of your span gas.
If the quotient is less than the Index value for the cell class you are
using, replace the cell.
Table 5-1: Cell Indices
Cell Class Index
A-3 1.818
A-5 1.818
B-1 4.545
B-3 3.716
B-5 1.244
B-7 1.515
C-3 2.488
C-5 0.606
5.3.3 Removing the Micro-Fuel Cell
The Micro-Fuel Cell is located inside the nylon cell block behind the
inner door of the unit. (See Figure 5-1). To remove an existing cell:
1. Remove power to the instrument by unplugging the power cord
at the power source.