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System Description
Ozonator Permeation Dryer
airflow stops, the flow sensor breaks the electrical circuit to the ozonator
and shuts it off to prevent the ozonator from overheating.
Ozonator
The permeation dryer minimizes routing maintenance procedures by
providing a continuous stream of dry air to the ozonator (using the
Permeation
selective water permeation characteristics of the dryer). With the
Dryer
permeation dryer option, it is not necessary to constantly replenish the
ozonator air-drying column as in the standard instrument.
NO
-to-NO
The NO
-to-NO converter heats molybdenum to approximately 325 °C in
2
2
order to convert and detect NO
. The converter consists of an insulated
Converter
2
housing, heater, replaceable cartridge, and a type K thermocouple sensor.
Permeation Oven
The 42iQ can be configured with an optional permeation oven for
generating NO
span gas. The permeation oven is configured as a DMC
(Optional)
2
module with self-contained temperature measurements and heater controls.
For more information, see "Internal Permeation Span Source" as described
in Chapter 9,
"Optional
Equipment".
Common
The common electronics contain the core computational and power
routing hardware for the 42iQ, and is replicated throughout other iQ series
Electronics
products
(Figure
8–1). It also contains front panel display, the USB ports,
the Ethernet port, and the optional I/O interfaces (RS-485, analog, and
digital).
Figure 8–2
shows the PCBA interconnect structure for the 42iQ, including
options. The modular design of the instrument is conveyed in the
architecture. Brief descriptions of the specific PCBAs follow.
Thermo Scientific
42iQ Instruction Manual
8-3
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