Ammonia Scrubber - Thermo Scientific 42iQ Instruction Manual

Optional Equipment

Ammonia Scrubber

Ammonia
Scrubber
NO
Converter
Permeation
Permeation Span
9-20 42iQ Instruction Manual
The ammonia scrubber is mounted internally and removes ammonia from
the sample air.
-to-NO
The 42iQ includes a Molybdenum NO
2
equipment. A stainless steel converter is available as an option.
Sample
The sample permeation dryer option is used when there may be widely
varying levels of ambient water vapor present. The dryer stabilizes the
moisture content of the sample stream providing a constant dew-point at
Dryer
the outlet over a wide range of inlet ambient moisture levels.
A secondary benefit of the sample dryer option is its ability to remove
ambient levels of ammonia (NH
Internal
The Internal Permeation Span Source option is designed to provide a
simple span check. This option is intended as a quick, convenient check to
be used between zero and span calibrations for determining instrument
Source
malfunction or drift. Because this option does not precisely control dilution
gas flow, it should not be used as a basis for instrument zero and span
adjustments, calibration updates or adjustment of ambient data.
Whenever there is an indication of possible instrument drift or
malfunction, a full zero and calibration should be performed prior to
corrective action. For further information on zero, span and calibration of
air pollution monitors, refer to Section 2.0.9 of the US EPA's Quality
Assurance Handbook for Air Pollution Measurement Systems (Volume II).
Figure 9–11
components. During normal operation, the pump draws zero air through
the permeation oven and out the instrument exhaust. When performing a
single point span check, the sample valve is energized, closing the sample
valve, and the Perm valve is energized, opening the perm valve. This directs
the zero air/NO
path for measurement.
) from the sample stream.
3
shows how this option is integrated with the 42iQ
gas mixture from the permeation oven into the sample
2
-to-NO converter as standard
2
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