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Thermo Fisher Scientific
Aerosol Monitor FHT 59 Si Technical Specification
Thermo Fisher Scientific Messtechnik GmbH Frauenauracher Straße 96 91056 Erlangen Germany www.thermo.com [email protected] +49 9131 998-0 +49 9131 998-475 fax
© 2010 Thermo Fisher Scientific Inc. All rights reserved. All trademarks are property of Thermo Fisher Scientific Inc. and its subsidiaries unless mentioned otherwise. This document is copyright protected and any reproduction of the whole or any part of this document is strictly prohibited, except with the written authorization of Thermo Fisher Scientific Inc. The contents of this document are subject to change without notice. All technical information in this document is for reference purposes only. System configurations and specifications in this document supersede all previous information received by the purchaser. Thermo Fisher Scientific Inc. makes no representations that this document is complete, accurate or error-free and assumes no responsibility and will not be liable for any errors, omissions, damage or loss that might result from any use of this document, even if the information in the document is followed properly.
Aerosol Monitor FHT 59 Si
Chapter 1
System Overview
The Aerosol Monitor FHT 59 Si is applied for the continuous automatic detection and early warning of aerosol-bound radio nuclides in the air.
A special compensation method eliminates the influence of high concentration levels of natural aerosol-bound radioactivity on the measured values of artificial radioactivity in the air. The use of an Ion-implanted silicon detector allows detecting alpha and beta radiation simultaneously. The artificial beta activity concentration is determined by means of the alpha beta ratio method.
The aerosols suspended in the air are collected on a special filter tape that is transported by a tape feed mechanism. After a pre-defined measurement period of 30 minutes the aerosol deposition spot is transported further by the tenth of the diameter (5 mm).
The Radon/Thoron equilibrium is maintained during a filter step by forwarding the filter tape by only 10 % of the filter diameter spot. A pump primes a constant air flow through the filter tape whereby the aerosol-bound activity is accumulated on the filter. The detector is mounted right above the particulate collection chamber and measures the activity simultaneously during deposition. The results are obtained in units of Bq/m³.
Thermo Fisher Scientific Technical Specification FHT 59 Si 1
Aerosol Monitor FHT 59 Si
The monitor offers the following features: Features Automatic measurement of natural and artificial radioactive alpha
and beta aerosols,
Measuring range for alpha aerosols 0.05 … 0.5 × 106 Bq/m³,
Measuring range for beta aerosols 0.3 … 0.5 × 106 Bq/m³,
Automatic compensation of the natural activity concentration by special evaluation routines,
Monitoring function with fast alarming,
Reliable filter tape feed mechanism,
Omni-directional detector shielding including the particulate collection chamber,
Self-control of the aerosol monitor with signalization concept,
Software for the evaluation of count rates including all relevant statistical criteria,
Evaluation electronics FHT 8000 A,
Air flow 10 … 12 m³/h; low noise maintenance free side channel blower uncontrolled, optional a controllable air flow with a maximum of 8 m³/h is available,
Serial interface for remote data transmission,
Long intervals of maintenance due to large reserve of filter tape,
Compact design in 19"-technique.
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Aerosol Monitor FHT 59 Si
Chapter 2
Functional Description
Measuring Principle
The analog signals of the aerosol measurement are assigned to the sixteen-fold counter card in the FHT 8000 A via 5 energy thresholds in the detector module input II.
Measured Values The results are obtained in units of Bq/m³ (= time integral of the activity concentration per volume unit).
Limit of Detection
(LD)
The minimum detectable activity concentration is provided according to DIN 25482 (optional ISO 11929):
Artificial α aerosols: 50 mBq/m3 with 30 min sampling time per filter step and 120 min effective reference time and an air flow of more than 10 m³/h.
Artificial β aerosols: 300 mBq/m3 with 30 min sampling time per filter step and 120 min effective reference time and an air flow of more than 10 m³/h.
With a statistical probability of 5 % for an error of the first kind (false alarm). With a statistical probability of 5 % for an error of the second kind (contamination not detected) is higher by the factor of 2.
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Aerosol Monitor FHT 59 Si
Chapter 3
Hardware Key Components
System Components
The Aerosol Monitor FHT 59 Si mainly consists of the following system components:
particulate collection module with integrated micro controller,
ion-implanted Si-detector with lead shielding,
pumping unit with air flow measurement,
measuring channel FHT 8000 A,
19"-rack housing for all components.
Pump Side channel blower,
Oil-free,
Air-cooled.
Detector Ion-implanted Si-detector with a diameter of 50 mm for the simultaneous detection of alpha and beta activity with integrated pre-amplifier.
The efficiency values of this detector related to 4π geometry (measured under operation conditions, source with a diameter of 50 mm in the particulate collection chamber) account to:
Radio nuclide ε [%] 60Co 6 ± 1 90Sr / 90Y 20 ± 3 137Cs 19 ± 2 204Tl 18 ± 2 241Am 15 ± 2
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Aerosol Monitor FHT 59 Si
Shielding Omni directional lead shielding made of ring elements above the filter drawer with top lid.
Ring elements, lead 50 mm, with top lid; shields detector plus pre-amplifier.
Measuring Channel
FHT 8000 A
The measurement channel FHT 8000 A is used as evaluation unit. The measurement channel contains all additionally required assemblies for supplying the detector and calculating the measurement values. A keyboard with a trackball is available in an additional 19" drawer. It is possible to connect an external TFT monitor.
16 × digital IN
14 × digital OUT
4 × USB
1 × Firewire IEEE 1394
3 × serial port RS 232
1 × Parallel port
1 × Ethernet
All evaluation routines are stored in the FHT 8000 A as software modules and include monitoring routines for the operation state. To avoid data loss in case of short term power failures, the FHT 8000 A is equipped with a back-up battery. The operating modes can be transmitted to a remote observation station via the system interfaces. All measurement values and the system status can also be transmitted.
Thermo Fisher Scientific Technical Specification FHT 59 Si 5
Aerosol Monitor FHT 59 Si
Chapter 4
Software
The FHT 8000 A includes all functions and programs relevant for the operation of the monitor. Hereby the full functionality of the monitor is established in stand-alone as well as in network operation.
Program modules for the following functions are available:
Start-up routines (setting parameters)
Data acquisition and evaluation routines
Air flow measurement
Limit value control
Calibration and Recurrent Calibration Check
Measurement of background signal
Control of tape feed mechanism
After powering on the monitor starts automatically. The main menu appears displaying the current measured values of the activity concentration.
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Aerosol Monitor FHT 59 Si
By pressing buttons the sub-menus Data and Errors can be accessed. The data menu displays all input parameters relevant for the data analysis. For example the filter activity, pressure, temperature and air flow are displayed in physical units.
In case of an error the corresponding text messages of the underlying physical reasons are displayed in the error menu.
Thermo Fisher Scientific Technical Specification FHT 59 Si 7
Aerosol Monitor FHT 59 Si
By pressing the button History, 150 data sets of the most important values are shown in line diagrams.
Via the recurrent calibration check (RCC) menu background count rates and the calibration factor can be determined by manually inserting the reference source into the particulate sampling unit.
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Aerosol Monitor FHT 59 Si
Chapter 5
Technical Data
Parameter Min. Typ. Max. Unit Condition/Note
Measuring Range α
0.05 0.5 × 106
Bq / m³
Measuring Range β
0.3 0.5 × 106
Bq / m³
LD for α (acc. to DIN 25482)
0.05 Bq / m³
LD for β (acc. to DIN 25482)
0.3 Bq / m³
Cycle meas. duration = 30 min,
Full meas. duration = 120 min,
Air flow > 10 m³/h
amb. DR level approx. 100nSv/h
Efficiency 6 ± 1
20 ± 3
19 ± 2
18 ± 2
15 ± 2
% 60Co 90Sr/90Y 137Cs 204Tl 241Am
Cross-sensitivity 5 µSv / h Related to 137Cs
Radiological
Thermo Fisher Scientific Technical Specification FHT 59 Si 9
Aerosol Monitor FHT 59 Si
Parameter Min. Typ. Max. Unit Condition / Note
Ambient Temperature
• operating
• storage
+15
+15
+30
+30
°C
on request other ranges of ambient temperature are available
Permitted Temp. Gradient
15 K/h
Sampled Air Intake Temperature
-5 +45 °C
Barometric pressure
• operating
• storage
900
900
1050
1050
hPa
on request other ranges of barometric pressure are available
Rel. Humidity of Sampled Air at Intake
20 80 % R.H.
Rel. Humidity
• storage
20 80 % R.H.
non-condensing
on request other ranges of relative humidity are available
Environmental Conditions
Parameter Min. Typ. Max. Unit Condition / Note
Mains Voltage 230 V AC, single phase
Mains Frequency
50 Hz Optional: 60 Hz
Power consumption
2.4 kVA
Electrical Connection
Parameter Min. Typ. Max. Unit Condition / Note
Height 1600
2000
mm Standard version
System version
without packing
Width 600 mm without packing
Depth 800 mm without packing
Weight 230 kg net, without packing
Cabinet 19 inch
Cabinet height 32
41
U Stand alone version
Systems version
Dimensions and Weight
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Aerosol Monitor FHT 59 Si
Parameter Min. Typ. Max. Unit Condition / Note
Diameter 50 mm
Cross-sensitivity
5 µSv / h for 137Cs
Operating Voltage
70 V
Shielding 50 mm lead, all directions
Detector
Parameter Min. Typ. Max. Unit Condition / Note
Degree of precipitation
99.97 % Test aerosols with particulate diameter < 1 µm
Degree of precipitation
99.95 % Radioactively induced test aerosols with particulate diameter < 0.3 µm
Filter length 42 m
Filter width 60 mm
Filter grade S According to DIN 24184
Aerosol Filter
Parameter Min. Typ. Max. Unit Condition / Note
Air Flow 8
10
12
m3 / h Type: 2BH1
Type: SE 3
Supply Voltage
230 V AC
Supply Frequency
50
50/60
Hz Type: SE 3
Type: 2BH1
Power Consumption
2.1 kW
Pump
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Aerosol Monitor FHT 59 Si
Electronics FHT 8000 A
Key features
• 16 × digital IN
• 14 × digital OUT
• 4 × USB
• 1 × Firewire IEEE 1394
• 3 × serial port RS 232
• 1 × Parallel port
• 1 × Ethernet
Key features
Filter tape feed mechanism with autonomous micro controller
Collecting cross sectional area 2000 mm²
Particulate Collection Module
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Aerosol Monitor FHT 59 Si
Chapter 6
Options
Analog Outputs
2 ea 0/4 - 20 mA analog outputs with driver software for:
• ratemeter artificial α activity concentration
• ratemeter artificial β activity concentration
Linear of logarithmic scale selectable.
Option 1
Option 2 Emission Rates
0 - 10 V analog input for external stack volume flow gauge.
Software module for the calculation of emission rates from the activity concentration values (Bq/m³) and the stack volume flow /m³/h). The emission rates are calculated in units of Bq/h and Bq/day.
Option 3 Data Transfer
The monitor is equipped with a RS232/V24 interface. The set of commands for data transmission is compatible to NetView.
Customer-specific transmission protocols can be implemented on request.
Option 4 Potential-free Digital Outputs
Relays with changeover contacts for a load up to 250 V/6 A
• Failure
• Alarm 1 α artificial concentration
• Alarm 1 β artificial concentration
• Alarm 1 α natural concentration
• Alarm 2 α artificial concentration
• Alarm 2 β artificial concentration
• Alarm 2 α natural concentration
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Aerosol Monitor FHT 59 Si
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Chapter 7
Consumables
Item Reference number
Fiber Glass Filter Tape (1 ea) KT149248089
Chapter 8
Reference Sources
Reference Source 241Am
Ref. no. SM149470026
Source activity: 3 kBq
Reference Source 90Sr
Ref. No. SM149475033
Source activity: 3.3 kBq
Chapter 9
Documentation Included
1 ea. Combined Hardware-Software Manual
1 ea. USB-Stick with Program, Configuration Utility and System Backup