Operation
EGM-4 Operator's Manual – Version 4.19
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Operation
The EGM-4 is a menu driven instrument. Note. If any external sensors/probes are to be
used with the EGM-4, they MUST be electrically connected to one (or both) of the I/O
ports prior to turning the instrument on. When the instrument is first powered up, it will go
through its normal warm-up period that takes approximately 5 minutes. Immediately after
powering up the system, the following is displayed:
Whereas:
Or
EGMH
Or
Refers to an EGM-4 with a measurement range up to 30,000
ppm.
Refers to an EGM-4 with a measurement range of 50,000 or
99,999 ppm.
Refers to PMR-5 Steady State Poromter.
Refers to the serial number of the EGM-4
Refers to the firmware (EPROM).
During warm-up, there is a delay of approximately 45 seconds to allow for calibration of the
electronics and then the instrument proceeds to warm-up until the Analyzer temperature
reaches 50 ˚C. A final Zero check is then performed before proceeding to the Main Menu.
Also during warm-up, several system checks are performed. The “Checksum” message is set
to a factory default value of 123456. If this is incorrect as when a new version of firmware is
first installed, a “CHECKSUM ERROR SEE MANUAL” message is displayed. If this occurs,
simply press any key to proceed to the Main Menu. From the Main Menu, press key 0 to re-
initialise the system (See Initialisation on page 43).
The next display will be dependent on whether or not any external sensors are being used
with the EGM-4.
If the EGM-4 is being used on its own, the following will be displayed:
Where:
Corresponds to the last calibration gas concentration. After DEFAULT, it is the
original range specified by the end user.
Range of the voltage signal corresponding to the CO
2
concentration.
Number of records stored in memory.
If the EGM-4 is being used with an external sensor (i.e. SRC-1 Soil Respiration Chamber),
the following will be displayed:
EGML 0456 V1.30
mV INPUTS R150
PROBETYPE 8 R150
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