Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D
The entire cartridge can be replaced, or just the charcoal inside of the cartridge. To replace the
scrubber materials:
1. Disconnect the scrubber from the clip of bracket and remove the fitting that holds the DFU
filter. While removing the cartridge, check the DFU filter for contamination and dirt. Replace
it if necessary.
2. Unscrew the top, remove the felt pad and empty the contents.
3. Inspect the upper and lower felt pads for signs of plugging, replace if necessary.
4. Replace with charcoal.
5. Re-install the felt pad and re-tighten the cap. Make sure the o-ring in the cap is in good shape
and squarely seated.
6. Leak check the assembly, then re-attach scrubber to fitting and clip on the bracket.
9.4 Cleaning Orifice and Orifice Filter The sample flow across the internal pneumatic system is fixed by the critical flow control orifice and
has no adjustment.
1. Turn off the instrument power.
2. Remove the elbow fitting toward rear panel only from the flow control module.
3. With a toothpick or paper clip, remove the spring, filter, o-ring , orifice, and the o-ring from
each port.
4. Discard the filter.
5. Check the orifice by looking at it toward a light to see that the orifice itself is open. If it is
not open, try cleaning the orifice with a strand of fine wire or immersing in a solvent such as
methyl alcohol, or both.
6. If the orifice will not open, replace it.
7. Replace o-rings if they are deformed or suspected not to seat properly.
8. To replace the orifice, start with the o-ring, then orifice (jeweled end faces upstream), o-ring,
filter, and finally spring.
9. Retape the fittings with TFE tape, install and tighten.
10. Leak check.
9-4