Using the LI-8150 Multiplexer
10-13
Figure 10-8. Cable connections for LI-8150 and a soil chamber.
Unlike the Auxiliary Sensor Interface that is used with the LI-8100A, the 8100-
104/C Long-Term Chambers are pre-wired with plugs on the exterior of the
chamber; when soil temperature or soil moisture probes are purchased from
LI-COR for use with the Multiplexer, they are fitted with plugs as well, which snap
onto the mated connectors on the chamber. For sensors from other manufacturers,
a plug with bare wire leads (p/n 392-08577) is provided that can be attached to the
sensor’s wire leads; a wiring diagram with pin numbers and wire colors is given
below.
Connecting Auxiliary Sensors
The 8100-104 and 8100-104C Long-Term Chambers have sockets for connection
of up to three auxiliary sensors. The three sealed connectors, labeled V2, V3, and
V4, are wired internally to 0-5V inputs. Bare wire leads (Fig. 10-9) with a mating
connector (p/n 392-08577) are also provided so that the user can connect sensors
from other manufacturers to any of the three connectors. Soil temperature and soil
moisture probes can be purchased from LI-COR that are pre-wired for direct
connection to the 8100-104/C. The V2-V4 connectors on the 8100-104/C Long-
Term Chambers are wired as follows:
Pin Number
Signal Wire Color
1 0v – 5v In + Brown
2 5V_Ref Out (4mA) Pink
3 +5v Out (100mA) Blue
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