Peripherals Support System; Fan; Step Pol Board; Sample Pump - Thermo Scientific 450iQ Instruction Manual

Peripherals
Support System

Step POL Board

Sample Pump

Solenoid Valve
Flow/Pressure

Firmware

450iQ Instruction Manual
The peripheral support system operates these additional devices that are
needed, but do not require special feedback control or processing. These
components are connected to a Peripherals Support Board (PSB).

Fan

The chassis fan provides air cooling of the active electronic components.
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.
Internal vacuum pump for generating air/sample through the instrument
Optional solenoid valves for switching between sample, zero, and span
gases, and other optional components.
Panel
The Flow/Pressure DMC is used measure instrument pressures that assure
proper flow regulation and for sample pressure within the measurement
DMC
bench for pressure corrections and compensation.
The DMC includes two pressure sensors that read 0-860 mmHg. These
sensors are used with the coupled restricting capillary for flow control along
with the downstream sample pump. The pressure differential determines
the flow through the capillary. The upstream pressure is the measurement
bench pressure, while the downstream pressure is at the pump inlet
pressure.
Like the hardware, the firmware is modular and located within
microprocessors distributed throughout the instrument. In the 450iQ,
microprocessors containing firmware are located as follows:
Optical Bench DMC
G

Flow/Pressure DMC

G
Peripherals Support Board
G
Optional I/O (Communications, Digital, and Analog)
G
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