Campbell-scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Manual de usuario Pagina 69
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Appendix D. Useful Equations
The following table lists all the variables and constants used in the equations
below:
TABLE D-1. Variables and Constants
Variable or Constant
Description
Units
c
ρ
CO
2
mass density mg·m
-3
v
ρ
H
2
O mass density g·m
-3
d
ρ
Mass density of dry air g·m
-3
c
X
CO
2
molar mixing ratio
(concentration relative to dry air)
µmol·mol
-1
v
X
H
2
O molar mixing ratio
(concentration relative to dry air)
mmol·mol
-1
c
M
Molecular weight of CO
2
44 mg·mmol
-1
d
M
Molecular weight of dry air 0.029 g·mmol
-1
v
M
Molecular weight of H
2
O 0.018 g·mmol
-1
P
Ambient pressure
kPa
R
Universal gas constant
8.3143×10
–6
kPa·m3·K
-1
·mmol
-1
T
Ambient temperature °C
e
Vapor pressure kPa
f
Enhancement factor Arbitrary
d
T
Dewpoint temperature °C
tmpd
T
_
Temporary variable for dewpoint
calculation
Arbitrary
Mass Density from Molar Mixing Ratios
( )
−
+
=
v
vc
c
c
MT
R
P
MX
ρ
ρ
15
.27310
6
(D-1)
( )
( )
v
vv
v
XTR
PMX
++
=
100015.
273
ρ
(D-2)
( )
( )
15.273+
−
=
TR
MeP
d
d
ρ
(D-3)
D-1
- INSTRUCTION MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Table of Contents 7
- Figures 9
- EC150 CO 11
- O Open-Path Gas 11
- Analyzer 11
- 3. Initial Inspection 12
- 4. Overview 12
- 4.3 Gas Head Memory 13
- 4.6.2 EC100 Outputs 14
- 4.8 Theory of Operation 16
- 5. Specifications 17
- 5.2 Output Signals 19
- 5.3 Physical Description 19
- 5.4 Power Requirements 20
- 6. Installation 21
- 6.3 Wiring and Connections 29
- 7. Zero and Span 32
- 7.2 Zero and Span Procedure 33
- or gain) for CO 37
- 8.2 Gas Analyzer Wicks 38
- 8.4 Zero and Span 39
- 8.5 Replacing CO 40
- Scrubber Bottles 40
- 8.6 Factory Recalibration 41
- 8.7 Troubleshooting 42
- 8.7.4 Diagnostic Flags 43
- Appendix A. EC150 Settings 49
- A.2.1 SDM Address 50
- A.2.2 Bandwidth 50
- A.2.3 Unprompted Output 50
- A.2.5 RS-485 Baud Rate 51
- A.2.6 Analog Output 51
- A.2.7 ECMon Update Rate 51
- A.2.8 Temperature Sensor 51
- A.2.10 Pressure Sensor 52
- A.2.10.1 Pressure Gain 54
- A.2.10.2 Pressure Offset 54
- A.3 ECMon 55
- A.6 Example CRBasic Program 60
- C.1 USB or RS-485 Output 65
- C.2 Analog Output 67
- Analog Outputs 68
- 109.5102.300072.1 PTPf 70
- Sheets (MSDS) 73
- E.2 Decarbite MSDS 80
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