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System Description
Peripherals Support System
Peripherals
The peripherals support system operates these additional devices that are
needed, but do not require special feedback control or processing. These
Support System
components are connected to a Peripherals Support Board (PSB).
Fan
The chassis fan provides air cooling of the active electronic components.
Step POL Board
The Step POL board provides high/low outputs for continuous operation
or on/off states. The Step POL board contains the basic circuitry to provide
a programmable load to passive devices, either continuously, or on user or
automated command. In the iQ Series instruments, the pump, solenoids,
etc., are controlled off of the Step POL board from commands generated
via the PSB.
External Pump
The external vacuum pump draws the reacted gases out of the reaction
chamber.
Mode Solenoid
The mode solenoid valve switches analyzer operation between the NO
mode and NO
mode. It routes the ambient air sample either through the
x
reaction chamber (NO mode) or through the NO
-to-NO converter and
2
then to the reaction chamber (NO
mode).
x
Solenoid Valve
Optional solenoid valves for switching between sample, zero, and span
gases, and other optional components.
Panel
Flow/Pressure
The flow pressure DMC performs the pressure measurements that assure
proper flow regulation, and also for the sample pressure within the reaction
DMC
chamber. It is coupled with a standard restricting capillary for flow when
the downstream pump is operating: Upstream pressure is ambient, while
downstream pressure allows determination of flow. A single PCBA with
microprocessor provides the active controls for the pressure measurements,
performs flow determination, and generates registers that interact with the
higher level system controls.
Thermo Scientific
42iQHL Instruction Manual
8-7
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Chapters
