Campbell-scientific AP200 CO2/H2O Atmospheric Profile System Manual de usuario Pagina 64
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AP200 CO
2
/H
2
O Atmospheric Profile System
message_log output table when the configuration command is sent and when
the settings are acknowledged. The IRGA settings are given in TABLE 7-1.
TABLE 7-1. IRGA Settings
Setting Value Notes
OUTRATE 0.5 Output data every 0.5 s
HEATER TRUE Turn heater on
PCOMP TRUE Pressure compensation on
FILTER 0 No filter
The outputs from the IRGA are shown in TABLE 7-2 and include:
TABLE 7-2. IRGA Outputs
Public variable Description Units
CO
2
CO
2
concentration ppm
H
2
O H
2
O concentration ppt
cell_tmpr Sample cell temperature °C
cell_press Sample cell pressure kPa
Td_cell H
2
O dewpoint °C
7.5 Zero/Span Flow
The flow for the zero and CO
2
span cylinders is affected by the pressure
regulator performance. Pressure regulators designed for a low delivery
pressure will generally perform better and should be used where possible. To
adjust these regulators, start with them set for 0-psig outlet pressure. Select the
corresponding inlet and observe the sample flow. Adjust the regulator outlet
pressure to give approximately the same sample flow as for the profile inlets
(within 10%).
Most pressure regulators will regulate the pressure only when there is flow
through them. When the flow stops (because the AP200 selects some other
valve), the pressure will rise above the setting. It will remain high until the
zero or CO
2
span valve is again selected, and the flow can resume. The flow
will be higher than normal (because pressure is higher than normal) until the
excess pressure is bled from the regulator and tube.
Most pressure regulators will also be affected by ambient temperature. If the
zero or CO
2
span sample flow varies excessively as the ambient temperature
changes, or if the pressure rise at shut-off is excessive, consider using a
different regulator.
The amount of zero or CO
2
span gas consumed depends on the details of the
application. The following example shows how to estimate the expected
consumption.
52
- INSTRUCTION MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Figures 9
- Table of Contents 12
- AP200 CO 13
- O Atmospheric Profile 13
- 3. Initial Inspection 14
- 4. Overview 14
- 4.1.2 Optional Components 16
- 4.1.3 Common Accessories 18
- 4.1.4 Other Accessories 21
- 4.1.5 Support Software 21
- 4.1.6 Replacement Parts 22
- 4.2 Theory of Operation 23
- 4.2.1 Intake Assemblies 25
- Ambient Pressure (kPa) 26
- 4.2.2 Valve Manifold 27
- 4.2.3 Pump Module 28
- 4.3 Specifications 30
- 5. Installation 32
- 5.1.2 AP200 Enclosure 33
- 5.1.3 Intake Assemblies 33
- 5.2 Plumbing 35
- 5.2.2 Zero and CO 37
- 5.2.3 H 38
- 5.3 Wiring 39
- 5.3.2 Intake Heater Cables 40
- 5.3.3 Power 44
- 5.4 Configure the Program 46
- 5.4.2 Compile Switches 49
- 5.6 Verify Performance 50
- 5.6.3 On-site System Checks 51
- 6.1 Automatic Zero and Span 52
- 6.2 Manual Zero and Span 53
- 6.2.2 Do CO 54
- 6.2.3 Do CO 55
- 6.2.4 Do H 56
- 7.1 Plumbing Leaks 58
- 7.2 Enclosure Desiccant 59
- 7.3 Intake Filters 59
- 7.4 LI-840A (IRGA) 62
- 7.4.2 Configuring the IRGA 63
- 7.5 Zero/Span Flow 64
- 8. Repair 65
- CONFIG CO2_SPAN_PPM ppm CO 79
- Appendix D. Output Tables 81
- Appendix H. Using Swagelok 105
- Fittings 105
- Back ferrule 107
- Front ferrule 107
- Pf 101046.30007.1 111
- J.1 Introduction 113
- J.2 Removal 113
- J.3 Installation 116
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