System Description
Common Electronics
8-4
410iQ Instruction Manual
Thermo Scientific
A constant purge flow of approximately 140 cc/min is recommended for
optimum performance. This is produced by feeding a purge gas to the rear
panel bulkhead at a constant pressure of 10 psig. A fitting with a 0.010-
inch laser drilled orifice delivers the required 140 cc/min purge flow. Flows
greater than this are not recommended due to unstable cooling effects on
the IR source. Lower flows are acceptable as long as the purge housing is
adequately purged for the application.
▲
The detector/preamplifier assembly converts infrared light, carrying
modulation and CO
2
sample absorption, into an amplified electrical signal
that undergoes processing.
The infrared light source is a special wire-wound resistor operated at high
temperature to generate broadband infrared radiation.
A single PCBA with microprocessor provides active controls for the above
elements, performs preliminary data processing, and generates registers that
interact with the higher level system controls.
The common electronics contain the core computational and power
routing hardware for the 410iQ, and is replicated throughout other iQ
series products (
Figure 8–3
). It also contains front panel display, the USB
ports, the Ethernet port, and the optional I/O interfaces (RS-485, analog,
and digital).
Figure 8–4
shows the PCBA interconnect structure for the 410iQ,
including options. The modular design of the instrument is conveyed in
the architecture. Brief descriptions of the specific PCBAs follow.
Detector Preamp
Infrared Source
Optical Bench DMC
Board
Common
Electronics
Содержание 410iQ
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