Perma Pure Ambi-GASS - Manual (Page 6)

6 Ambi-GASS User Manual
It is important that the dryer removes water in the vapor state only to avoid the problems
that arise when the membrane comes in contact with liquid water. If liquid water is
introduced into the dryer, efficiency will decline and the dryer could fail to perform
altogether. The tubing elongates approximately 10% over its dry length when saturated with
liquid water causing the tubing to kink inside the dryer housing, reducing the drying.
2.4 Ammonia Scrubber (optional)
The optional ammonia scrubbing canister must be used when ammonia or urea is used for the
purpose of lowering NO
x
levels or at any time ammonia is present in the sample stream.
Ammonia salts can deposit in the dryer tubes if not removed and cause permanent loss of
drying efficiency. The ammonia scrubber consists of a polysulfone and 316 SS housing
filled with phosphoric acid impregnated berl saddles. These berl saddles will require
periodic replacement at a frequency dependent on the inlet ammonia concentration.
2.5 Purge Air Eductor (optional)
The eductor will provide the desired vacuum inside the dryer shell to compensate for any
small vacuum that the sample may be under. This is done to prevent the membrane tubes
from collapsing under pressure of the purge air.
2.6 Purge Air Dryer (optional)
If - 40
°C dewpoint or drier purge air is not available, a heatless air dryer can be installed in
the Ambi-GASS to dry a compressed air supply. Operation of the heatless dryer is fully
automatic and continuous.
2.7 Sample Pump (optional)
Perma Pure can supply a gas sample pump to draw sample and supply it to the analyzer.
The pump supplies up to 5 liters per minute of sample. Typical pump location is between
the filter and the ammonia scrubber (when installed).
Figure 3