Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Uživatelský manuál Strana 54
- Strana / 70
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
11. Theory of Operation
The EC155 is a non-dispersive mid-infrared absorption analyzer. Infrared
radiation is generated in the larger block of the analyzer before propagating
through a 12 cm sample cell. Chemical species located within the sample cell
will absorb radiation at characteristic frequencies. A mercury cadmium
telluride (MCT) detector in the smaller block of the gas analyzer measures the
decrease in radiation intensity due to absorption, which can then be related to
analyte concentration using the Beer-Lambert Law:
cl
o
ePP
ε
−
=
where P is irradiance after passing through the optical path, P
o
is initial
irradiance, ε is molar absorptivity, c is analyte concentration, and l is
pathlength.
In the EC155, radiation is generated by applying constant power to a tungsten
lamp, which acts as a 2200 K broadband radiation source. Specific
wavelengths are then selected using interference filters located on a spinning
chopper wheel. For CO
2
, radiation with a wavelength of 4.3 µm is selected, as
it corresponds to the molecule’s asymmetric stretching vibrational band. For
H
2
O, radiation at 2.7 µm, corresponding to water’s symmetric stretching
vibrational band, is used.
The EC155 is a dual wavelength single beam analyzer; thus, rather than using a
separate reference cell and detector, the initial intensity of the radiation is
calculated by measuring the intensity of nearby, non-absorbing wavelengths
(4 µm for CO
2
and 2.3 µm for H
2
O). These measurements account for any
source and detector aging and window contamination.
The chopper wheel spins at a rate of 100 revolutions per second, and the
detector is measured 512 times per revolution, resulting in a detector sampling
rate of 512 kHz. The detector is maintained at -40
o
C using a 3-stage
thermoelectric cooler and is coupled to a low noise pre-amp module.
The EC100 electronics digitize and process the detector data (along with
ancillary data such as sample-cell temperature and pressure) to give the CO
2
and H
2
O concentration for each chopper wheel revolution (100 Hz), filtered to
the user-specified bandwidth. The EC100 also synchronously measures and
processes data from an optional CSAT3A 3D sonic anemometer head.
44
- INSTRUCTION MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Table of Contents 7
- EC155 CO 11
- O Closed-Path Gas 11
- Analyzer 11
- 3. Initial Inspection 12
- 4. Overview 12
- 5. Specifications 13
- 5.2 Output Signals 15
- 5.3 Physical Description 16
- 6. Installation 18
- 6.2 Plumbing 21
- 6.2.3 Filtration 22
- 6.2.4 Plumbing Connections 22
- 6.3 Wiring and Connections 24
- 7. Settings 27
- 7.2 Details 28
- 7.3 ECMon 30
- 8. EC100 Outputs 33
- 8.2 USB or RS-485 Output 34
- 9. Maintenance 36
- 9.4 Zero and Span 41
- Scrubber Bottles 44
- 9.6 Factory Recalibration 46
- 10.1 EC100() Instruction 47
- 11. Theory of Operation 54
- No Units 56
- 109.5102.300072.1 PTPf 60
- Intake Maintenance 61
- C.2.2 Solvent Flush 62
- Sheets (MSDS) 63
- D.2 Decarbite MSDS 64
- Appendix E. EC155 Packing 67
- Information 67
Související produkty a manuály pro Měřící nástroje Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1
Měřící nástroje Campbell-scientific EnviroSCAN Sentek Water Content Profile Probe Uživatelský manuál
(44 stránky)
(44 stránky)
Měřící nástroje Campbell-scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Uživatelský manuál
(86 stránky)
(86 stránky)
Měřící nástroje Campbell-scientific ENC10/12, ENC12/14, ENC14/16, ENC16/18 Enclosures Uživatelský manuál
(48 stránky)
(48 stránky)
Měřící nástroje Campbell-scientific HC2S3 Temperature and Relative Humidity Probe Uživatelský manuál
(42 stránky)
(42 stránky)
Měřící nástroje Campbell-scientific HFP01SC Hukseflux Self-Calibrating Soil Heat Flux Uživatelský manuál
(32 stránky)
(32 stránky)
Měřící nástroje Campbell-scientific HMP35C Temperature and RH Sensor Uživatelský manuál
(16 stránky)
(16 stránky)
Měřící nástroje Campbell-scientific HMP155A Temperature and Relative Humidity Probe Uživatelský manuál
(48 stránky)
(48 stránky)
Měřící nástroje Campbell-scientific HydroSense® Soil Water Content System (CS620, CD62 Uživatelský manuál
(28 stránky)
(28 stránky)
Měřící nástroje Campbell-scientific ET107 Evapotranspiration Monitoring Station Uživatelský manuál
(114 stránky)
(114 stránky)
Měřící nástroje Campbell-scientific HydroSense II Support Software User Guide Uživatelský manuál
(82 stránky)
(82 stránky)
Měřící nástroje Campbell-scientific IRGASON Integrated CO2/H2O Open-Path Gas Analyzer Uživatelský manuál
(66 stránky)
(66 stránky)
Muvit MUSLI0537 manuals
Owner’s manuals and user’s guides for Mobile phone cases Muvit MUSLI0537.
We providing 1 pdf manuals Muvit MUSLI0537 for download free by document types: Datasheet
Komentáře k této Příručce