Using the LI-8150 Multiplexer
10-15
are dedicated for use with sensors attached to the 8100-104/C Long-Term
Chambers.
Measurement Quick Start
This section is designed to quickly demonstrate a simple LI-8100A measurement
using the LI-8150 Multiplexer. For the purposes of this discussion we will refer to
the use of the LI-8100A Windows application software. Follow these steps to
complete this tutorial:
1. Connect the cables, power supply, and computer as described above, and in
Section 2, Initial Setup.
2. Install the Windows application software as described in Section 8, Installing
the PC Communications Software.
3. Connect as many soil chambers as desired. Optionally, install extension
cables as described above. You may want to connect soil temperature, soil
moisture probes, etc. at this time.
4. Place the chamber(s) on a soil collar. Collar installation is discussed in detail
in Section 2, Initial Setup. If you have not installed the soil collars yet, refer to
Section 2, Installing the Soil Collars.
5. Turn the Multiplexer on first using the power switch on the inside panel, and
then turn the LI-8100A on using the ON/OFF button on the keypad on the
inside panel of the Analyzer Control Unit. If everything is connected properly,
all chambers connected will automatically open in series (4 at a time). Wait
for the "Ready" light to come on.
6. Open the LI-8100A Windows application software and click on the Connect
icon, or choose Connect from the Communication menu. Choose the serial
(COM) port on the computer to which the LI-8100A is connected, or enter the
IP address if connected via Ethernet. When the LI-8150 and LI-8100A are
powered on in the proper sequence, the software will automatically sense the
presence of the Multiplexer; the available functions change accordingly.
7. Optional: The Multiplexer is tested before shipping from the factory; you may,
however, wish to perform a leak test to ensure the integrity of all tubing
connections. The LI-8100A bellows pump circuit is used to pressurize each
chamber port to test for leaks; the air hoses and solenoids for each port are
tested – the chamber itself is isolated from the circuit and is not part of the
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