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Appendix C. Output Variables
at seven records per sequence, and sequences run every hour). The CPU has
storage allocated for 500 records (3 days).
The zero_span table is defined only if VALVE_MODULE = True. As a
result, only the last five values, associated with the scrub module, are optional
depending on the SCRUB_MODULE compile switch.
The value of the compile switches as shown in TABLE C-3 depends on the
constants as described in Section 5.4.2, Compile Switches. The code shown in
the table can be either V, S, or a combination of two of the codes.
V is defined if VALVE_MODULE = True
S is defined if SCRUB_MODULE = True and
VALVE_MODULE = True
TABLE C-3. Values stored in table zero_ span
Compile
Switch
Variable Name
Units
Description
V
TIMESTAMP
TS
Date and time the record was measured
V
RECORD
RN
Record number
V
Sequence_Step
Status of the zero/span sequence (see Section 6.2, Automatic
Zero and Span, for details)
V
ValveNumber
Valve number (0 to 6); determines which zero/span valve is
selected
V
CO2_Avg
µmol∙mol
-1
Average of CO
2
V
H2O_Avg
mmol∙mol
-1
Average of H
2
O
V
diag_irga_Avg
Average of diag_irga
V
cell_tmpr_Avg
ºC
Average cell temperature
V
cell_press_Avg
kPa
Average cell pressure
V
CO2_signal_Avg
Average CO
2
signal
V
H2O_signal_Avg
Average H
2
O signal
V
diff_press_Avg
kPa
Average differential pressure
V
source_tmpr_Avg
ºC
Average source temperature
V
pump_ON_Avg
Fraction of time the pump was on
V
pump_flow_Avg
LPM
Average pump flow
V
pump_control_Avg
Average pump control value
V
pump_press_Avg
kPa
Average pump pressure
V
diag_CPEC_Avg
Average of diag_cpec
V
fast_samples
Number of samples included in the averages for values
measured in the main scan
V
buff_depth_Max
Maximum buffer depth during the output interval
V
process_time_Avg
µsec
Average processing time
V
PressOffset
kPa
Sample cell pressure measured with no flow; used to infer
valve flow
V
valve_flow_Avg
LPM
Average zero/span flow
V
valveControl_Avg
Average of zero/span flow control valve; can be from 0
(closed) to 1 (open)
V
PumpTmprOK_Avg
Fraction of time the pump temperature was within its
operating range
V
pump_tmpr_Avg
ºC
Average pump temperature
V
pump_heat_Avg
Fraction of time the pump heater was on
V
pump_fan_Avg
Fraction of time the pump fan was on
C-6
- 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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