Thermo Scientific 5028i, Инструкция по эксплуатации, Страница: 33 / 330

Introduction
Specifications
Thermo Fisher Scientific Model 5028
i
Instruction Manual 1-7
concentration changes.
The Model 5028
i has implemented this procedure to determine
separately the natural activity in the aerosol and to eliminate this
error for each measurement chamber. This procedure further allows
the Model 5028 i to provide a more stable reading at lower ambient
particulate concentrations compared to similar methods. Furthermore,
from this information the activity concentration of the natural noble gas
Radon is derived.
The measurement chamber houses an RTD temperature sensor in
each channel. The T-sensor directly measures the temperature of the
incoming sample stream for a continuous air mass compensation,
and the flow system. The flow and ambient sensor measurements
are combined within a firmware algorithm to maintain an accurate
measurement and control of volumetric flow at the inlet and through
the differential orifice.
The Model 5028
i also includes five pressure sensors to measure the
differential pressure across a subsonic orifice, vacuum under the filter
tape, and barometric pressure. The flow P-sensors are solely used for
measurement at the orifice for flow rate control. The vacuum sensors
use for air mass compensation, as an indicator for clogging of the system
and are included in the volumetric flow control. The barometric P-sensor
uses for air mass compensation and for volumetric flow rate regulation.
The volumetric flow system is built on a calibrated feedback signal from
the CPU to the proportional valve signal. By using this flow control,
flow stability is easily maintained.
Table 1–1 lists the specifications for the Model 5028 i .
Table 1–1. Model 5028
i
Specifications
Safety/Electrical Designations
Designed to meet:
CE: EN61326-1:2013, EN61326-2-2:2013, IEC/EN61010-1:2010; IEC/EN61010-2-081:2015
UL: 61010-1:2012, UL61010-2-081:2015
CSA: C22.2 No.61010-1:2012, CSA C22.2 No.61010-2-081, ICES-003 Issue 6 (2016)
FCC: CFR 47 Part 15:2015, ANSI C63.4:2014
Source and Detector
Two β Sources: Carbon-14, <3.7 MBq (<100 μCi) Sealed Source Device
Two Proportional Detectors
Standard System Configuration
Menu-driven software for user interaction via 320 x 420 pixels graphics display
Connecting and Interface Cables, and Vacuum Pump
Specifications