Thermo Scientific 5030i SHARP, Инструкция по эксплуатации

Страница: 29 / 403

Thermo Fisher Scientific Model 5030 i SHARP Instruction Manual 1-1
Chapter 1
Introduction
The Model 5030 i Synchronized Hybrid Ambient Real-time Particulate
(SHARP) Monitor is a hybrid nephelometric/radiometric particulate mass
monitor capable of providing precise, real-time measurements with a
superior detection limit. The SHARP Monitor measures the mass
concentration of ambient PM
10
, PM
2.5
, and PM
1.0
aerosol in real-time. The
SHARP Monitor incorporates a high sensitivity light scattering photometer
whose output signal is continuously reference to the time-averaged
measurements of an integral beta attenuation mass sensor, as developed on
the Model 5014
i Beta. This system achieves heretofore-unattained short-
term precision and accuracy. The SHARP Monitor incorporates advanced
firmware to optimize the continuous mass calibration of the nephelometric
signal, ensuring that the measured mass concentration remains independent
of changes in the particle population being sampled.
The SHARP Monitor incorporates a dynamic heating system (DHS)
designed to maintain the relative humidity of the air passing through the
filter tape of the radiometric stage below the user-defined threshold,
typically below the point at which the collected particles accrete and retain
liquid water. This DHS system minimizes the internal temperature rise by
not heating when sample relative humidity is below the threshold to which
the heater is controlling. As the ambient RH increases above the threshold,
the applied heating is optimized to maintain the RH threshold at the
sample filter tape. The purpose of this heating system is specifically
designed to force the continuous mass monitor to agree with the
gravimetric reference method and the relative humidity conditions to
which the reference filter samples are conditioned. Furthermore, sufficient
flexibility is provided within the firmware to configure the heating
conditions to satisfy global monitoring protocols.
The measuring range of the Model 5030 i is 0-10,000 μg/m 3 .
A complete particulate measuring assembly consists of the following main
parts:
●
SHARP Optics Module
●
SHARP Beta Module
●
Ambient Inlet Sampling System (PM
10
, PM
2.5
, PM
1.0
)
●
Dynamic Heater