EGM-5 Operation Manual V. 1.04 21 support@ppsystems.com
To change Pump Power, press on % value (with black background) and enter your required % from 0-
100. We strongly recommend a flow rate of approximately 280-350 cc/min for optimal performance.
Important Note. If the flow rate drops below 50 cc/min, a “low flow" error message will be displayed in
the status box. Typically this is the result of flow restriction caused by either the external air filter or a
blocked internal hydrophobic filter located inside the EGM-5 enclosure. First, replace the external air filter
connected to the GAS IN port to see if this corrects the problem. If it doesn’t then the likely problem is a
blocked internal hydrophobic filter See
Hydrophobic Filter on page 123 for information related to changing
this filter.
USB Flash Drive Port
A USB Flash Drive Port is available on the back panel to allow users to save data directly to a USB flash
drive (also commonly referred to as a “thumb drive” or “memory stick”). When a USB flash drive is
inserted into the USB port, the LED indicator will first turn red in recognition of the USB flash drive and
then it will flash green indicating that data is being saved to it automatically. If the indicating LED is a
steady green then data is not being saved because the “Interval (sec)” is likely set to 0 under Memory
Measure Settings. See Memory Measure Settings on page 48 for more information on this.
USB PC Port
The USB PC Port (USB Mini-B) can be used to connect the EGM-5 to a PC. Measured data is
continuously sent through this port. The PP Systems’ GAS software or a terminal emulation program (i.e.
HyperTerminal) can then monitor the measured data. GAS software is supplied on the USB flash drive
supplied with the EGM-5 and it is also available for free download from our website. When using a
terminal emulator, the COM port settings to communicate with the EGM-5 are: 19200 baud, 8 bit, 1 stop,
no parity, no flow control.
Probe Ports
There are 2 digital PROBE PORTS available for use with external sensors/accessories. The current list of
supported probes/sensors include:
• Quantum Sensor (Apogee Instruments)
• TRP-3 Temperature & PAR Probe
• STP-2 Soil Temperature Probe
• SRC-2 Soil Respiration Chamber
• CPY-5 Canopy Assimilation Chamber
• Soil Moisture & Temperature Sensor (Stevens Water Monitoring Systems)
Up to two different probes can be used at the same time, for example, the SRC-2 Soil Respiration
Chamber and the STP-2 Soil Temperature Probe. Note that some combinations of the above probes will
not be possible, for example, the TRP-3 and SRC-2 Soil Respiration Chamber.
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