Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 54)

Optional Hardware and Software Model 9110EH Instruction Manual
5.7. Scrubbers and Expendables
5.7.1. Charcoal Scrubber
This kit includes a charcoal scrubber cartridge, which is used to remove NO
2
from an
exhaust port. Applications include, but are not limited to, the removal of NO
2
from the
pump exhaust if that exhaust cannot be vented outside the analyzer shelter or if the vent
line is not far enough away from the analyzer inlet port (in which case the exhaust would be
measured again by the analyzer). The kit does not include any mounting clips, filters or
tubing. To order a refill for this cartridge, specify the refill kit listed below.
Older models of the nitrogen oxides analyzer used this type of charcoal scrubber to remove
both NO
2
and excess ozone from the exhaust. However, we do not recommend this
particular application because of the potentially explosive nature of the mixture.
5.7.2. Charcoal Refill Kit
This refill kit contains two plastic bottles with a total of 2.5 kg (5.5 pounds) charcoal, which
lasts for about five refills.
5.7.3. Zero Air Scrubber
This kit includes a zero air scrubber cartridge, which can be used to produce and supply
zero air to the analyzer’s ZERO inlet port. The cartridge mounts to the outside rear panel by
means of two rubberized clips and contains two chemicals, 50% volume of Purafil Chemi-
sorbant to convert NO to NO
2
, followed 50% volume of charcoal to absorb NO
2
.
The zero air scrubber exit contains a particle filter that retains any dust coming from the
cartridge and connects with a 0.25” PVC tubing to the ZERO inlet port. The chemicals need
to be exchanged periodically (use Option 43) to prevent saturation and break-through of
NO
X
into the zero air stream. This kit is recommended if no other zero air source is available
and if the analyzer is equipped with the zero/span valve option (Section 5.6.1). The kit is
included in the IZS option but not in the zero/span valve option.
5.7.4. Zero Air Scrubber Maintenance Kit
This kit includes the items needed to refurbish the external zero air scrubber.
Table 5-3: Contents of Zero Air Scrubber Maintenance Kit
Description
Activated charcoal refill
Purafil Chemisorbant ® refill
Sintered filter for critical orifice port
Replacement particulate filter for zero air inlet fitting
O-Ring (qty:2) for critical orifice port
1 These items are required for units with IZS option only. They are used for rebuilding the
IZS-exhaust critical flow orifice on the analyzer’s exhaust manifold.
40 M9110EH Rev 0