Thermo Scientific 42iQD, Instruction Manual

Page: 241 / 286

System Description
Ozonator Permeation Dryer
Thermo Scientific 42iQD Instruction Manual 8-3
The permeation dryer minimizes routing maintenance procedures by
providing a continuous stream of dry air to the ozonator (using the
selective water permeation characteristics of the dryer). With the
permeation dryer option, it is not necessary to constantly replenish the
ozonator air-drying column as in the standard instrument.
The NO
2
-to-NO converter heats molybdenum to approximately 325 °C in
order to convert and detect NO
2
. The converter consists of an insulated
housing, heater, replaceable cartridge, and a type K thermocouple sensor.
The common electronics contain the core computational and power
routing hardware for the 42iQD, and is replicated throughout other iQ
series 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 42iQD,
including options. The modular design of the instrument is conveyed in
the architecture. Brief descriptions of the specific PCBAs follow.
Ozonator
Permeation
Dryer
NO
2
-to-NO
Converter
Common
Electronics