Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Manual de usuario Pagina 74
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Appendix B. Public Variables
TABLE B-1. CPEC200 public variables
When Defined
Usage
Variable Name
Units
Description
always
DIAG
BattVolt_OK
Boolean flag: False if the
CPEC200 system has shut
down because the supply
voltage was too low
always
INFO
panel_tmpr
ºC
Temperature of the datalogger
wiring panel
always
INFO
process_time
µs
Time to process the scan (a
copy of ProcessTime from the
Status table)
always
INFO
buff_depth
Number of scans in the pipeline
buffer that have not yet been
processed (a copy of BuffDepth
from the Status table)
always
DIAG
buff_depth_OK
Boolean flag: False if
buff_depth exceeds the limit
(disables pump speed and valve
flow controls)
always
INFO
intake_heater
V
Voltage applied to the EC155
intake heater
Leaf_Wetness_Sensor
INFO
leaf_wetness
Measurement from an optional
leaf wetness sensor (used to
control intake heater voltage)
always
CONFIG
BATT_LOWLIMIT
V
CPEC200 will power down if
supply voltage falls below this
limit
always
CONFIG
BATT_DEADBAND
V
CPEC200 will power up if
supply voltage rises this much
above the lower limit
always
CONFIG
SONIC_AZIMUTH
degrees
Angle between true north and
the direction the CSAT3A is
pointing
always
CONFIG
BANDWIDTH
Hz
EC100 digital filter bandwidth
always
CONFIG
AMB_PRESS_NOMIN
AL
kPa
nominal ambient pressure for
CPEC200 elevation
always
CONFIG
PUMP_SETPT
LPM
Flow setpoint for sample pump
speed control
always
CONFIG
CAL_INTERVAL
min
Time between automatic
zero/span sequences
always
CONFIG
CAL_TIMEOFFSET
min
Time offset for starting
automatic zero/span sequences
always
CONFIG
ZERO_TIME
s
Time to flow zero gas
always
CONFIG
SPAN_TIME
s
Time to flow CO
2
span gas
always
CONFIG
CAL_FLOW_SETPT
LPM
Flow setpoint for zero/span
always
CONFIG
CO2_SPAN_PPM
µmol∙mol
-1
CO
2
mixing ratio in the CO
2
span cylinder
always
CONFIG
USE_DIFF_PRESS
Set = True to enable the EC155
differential pressure sensor
always
CONFIG
CHECK_ZERO
Set = True to enable automatic
zero/span sequences
B-4
- INSTRUCTION MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Table of Contents 7
- Figures 9
- 1. Introduction 11
- 2. Cautionary Statements 11
- 4. Overview 12
- 3. Initial Inspection 12
- 4.1.2 Optional Components 14
- 4.1.3 Common Accessories 18
- 4.1.4 Support Software 20
- 4.1.5 Replacement Parts 21
- 4.2 Theory of Operation 23
- 4.2.3 Valve Module 24
- 4.2.4 Pump Module 26
- 5. Installation 27
- 5.1 Mounting 28
- 5.1.3 Install EC Sensors 29
- 5.2 Plumbing 31
- 5.2.2 Zero/Span 32
- 5.3 Wiring 33
- 5.3.2 EC Sensor Cables 34
- 5.3.3 Pump Module Cable 37
- 5.3.4 Apply Power 37
- 5.4 Configure the Program 38
- 5.5 Verify Proper Operation 42
- 6. Zero and Span 43
- 6.2 Automatic Zero and Span 44
- 6.3 Manual Zero and Span 45
- 7.1 Enclosure Desiccant 50
- 7.2 EC155 Intake Filter 50
- 7.3 EC155 Windows 50
- 8. Repair 51
- A.1 Overview 53
- A.2 Status Text Variables 53
- Appendix D. Control Bits 89
- Appendix E. Using Swagelok 91
- Fittings 91
- Back ferrule 93
- Front ferrule 93
- Power Adapter Kit 95
- G.1 Theory of Operation 99
- G.3 Installation 100
- G.4 Maintenance 101
- Appendix H. CPEC200 Pump 105
- Replacement 105
- H.3 Installation 108
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