Sharp SYSTEM 8/10 Plus Manual de instrucciones descargar pdf (Pagina 276)

System Description

Hardware

8-4 Model 5030i SHARP Instruction Manual Thermo Fisher Scientific

The nephelometer assembly uses an 880 nanometer incident light source

and hybrid silicon photodetector to measure the intensity of scattered light

in the presence of aerosol. This assembly houses a nephelometer,

temperature sensor, relative humidity sensor, and PCB interface.

The primary measurement head uses a beta source and proportional

alpha/beta detector to measure the attenuation of beta particles by sampled

aerosol across a glass fiber filter and to discriminate against any naturally

occurring beta interferences from the daughter nuclides of alpha decay

products.

This cylindrical tube houses a printed circuit board, provides power to the

proportional detector and amplifies the beta and alpha counts prior to

being sent to the 5030i measurement interface board.

This small printed circuit board includes a photo-interrupter to detect the

closed position of the measurement head. This is connected to a motor

assembly used to open and close the measurement head.

This small printed circuit board is mounted onto a chopper wheel that

measures the amount of filter tape advanced during a filter tape change.

The proportional valve is a proportional solenoid valve that is used as a

means of flow control. In response to the measured flow across a subsonic

orifice, the proportional valve will either partially open or close to make a

flow adjustment in real-time.

This motor is used to drive the cam to rotate. By rotating the cam, the

measurement head lever arm is raised and lowered for opening and closing

the measurement head during a filter tape change.

After the measurement head is opened, this motor is used to advance the

filter tape a fixed amount prior to initiating another beta attenuation event

on a fixed sample spot.

Nephelometer

Assembly

Primary

Measurement Head

Detector Amplifier

Cam Photo Interrupt

Board

Counter Wheel Interrupt

Board Assembly

Proportional Valve

Cam Motor

Tape Motor

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Sharp SYSTEM 8/10 Plus Manual de instrucciones Pagina 276