Operation
EGM-4 Operator's Manual – Version 4.19
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At this stage, the SRC-1 chamber should be held in the air to allow it to flush out prior to
placing it on the soil. The number in the bottom right (03 in this case) is a count from 0-15 in
1.6 second increments. When completed, the following is displayed
(Display 7):
After placing the SRC-1 chamber on the soil, press the Y key. The following will be displayed
(Display 8)
:
After approximately 5 seconds, the measurement will commence. Before final calculation of
soil respiration rate (g (CO
2
) m
2
Hour) can be achieved, the EGM-4 must have accumulated 4
data sets. The measurement display is as follows
(Display 9):
Where:
C 395
Current measured CO
2
concentration (ppm)
H14.7
Humidity concentration
if optional %RH/Temp sensor is present
(mb)
T22
Soil Temperature
if optional STP-1 probe is present
(˚C)
A02.11
CO
2
exchange (Assimilation) rate (g (CO
2
) m
2
Hour). The maximum rate that
can be recorded is 99.99 g (CO
2
) m
2
Hour.
Q0000
PAR (µmol m
-2
s
-1
)
110
The elapsed time of measurement (seconds). At the conclusion of
measurement, END will be displayed.
At the conclusion of measurement, the following is displayed:
At completion of measurement (with END displayed), press any key to continue. You are now
given the option to save the record.
Press the Y key to save the record. Press the N key if you do not want to save the record.
Please Note.
If the DC or DT exceeds the set values, the following message is displayed:
This message is displayed with the quadratic fit if the C term in the quadratic fitting expression
(Y = a + bx + cx
2
) is greater than 0.1 x b.
EQUILIBRATION
PLEASE WAIT 03
C 395 H14.7 T22
A02.11 Q0000 110
NON-LINEAR FIT
PLACE ON SOIL
PRESS Y TO START
C 395 H14.7 T22
A02.11 Q0000 END
RECORD Y/N
