PP Systems EGM-5 User Manual

EGM-5 Operation Manual V. 1.04 64 support@ppsystems.com
CPY Data Plot Screen
♥ (Heartbeat)
Pulses on and off to indicate that the system is powered on (power
status).
75%
Percentage of battery life remaining.
C: 603
Current measurement of CO
2
Concentration (ppm).
Delay/CAL/END
Delay is the countdown in seconds from x to 0, where x is the Delay
value specified in CPY – Termination Settings (Step 3). CAL is the active
CO
2
concentration calculating phase. END indicates calculations have
been terminated.
dC
The current difference in CO
2
concentration (ppm) from time = 0
seconds. Normally in assimilation, CO
2
concentration is decreasing, but
for display purposes the negative values are inverted.
dT
Elapsed time (seconds) for the current session (i.e., change in time).
L
Linear assimilation rate (μmol m
-2
s
-1
).
Q
Quadratic assimilation rate (μmol m
-2
s
-1
).
Plot
Plot number defined by user in CPY – Other Settings (Step 4).
X-axis
Time (1 second interval)
Y-axis
dC (change in CO
2
concentration)(ppm)
maxDC
Maximum negative change in CO
2
concentration (ppm) allowed in a
given session. This value is defined in CPY – Termination Settings (Step
3).
maxDT
Maximum time for which changes in the chamber CO
2
concentration are
monitored in a given session. This value is defined in CPY – Termination
Settings (Step 3).
Abort
Stops the CPY process and returns to CPY – Other Settings (Step 4).
Only the individual CO2 measurements are saved to the USB flash drive.
Process data is discarded.
Status Box
Any information or error messages are displayed here.
New
Stops the CPY process and returns to CPY – Other Settings (Step 4).
Results are saved to the USB flash drive.
The measurement sequence will terminate when the maxDC or maxDT is reached. If maxDT is reached
first, the message “Time limit” will appear in the status box. If maxDC is reached first, the message “CO2
limit” will appear in the status box.
For more information on the theory and calculation of soil respiration/canopy assimilation, please refer to
Appendix 1. Soil CO
2
Efflux and Net Canopy CO
2
Flux on page 124.
Custom Process
This process is available for users that want to use their own custom chambers with the EGM-5. Since it
is assumed that you are using your own chambers there are no “defaults” built into the system. It is your
responsibility to make sure that you enter the appropriate values where required in order to ensure proper
calculations.

PP Systems EGM-5 Specifications

General

Brand	PP Systems
Model	EGM-5
Category	Measuring Instruments
Language	English