Initial Setup
2-15
Connecting Soil Moisture/Temperature Probes to the Auxiliary Sensor
Interface
The 8100-201 Omega Soil Temperature Probe (Omega Engineering Inc., Stamford,
CT) is a 10” (25.4 cm) thermocouple probe terminated with two bare wires for
connection to the Auxiliary Sensor Interface. Thermocouple channels 1-4 (T1-T4)
can be used with the Omega soil temperature probe; the probe must be set up in
software (choose Type E thermocouple).
V1 V2
8100-201 Omega Probe
Purple (positive)
V3 V4
T1
T2 T3 T4
+
GND
+
GND
+
GND
+
GND
GND
GND
+
-
+
-
+
-
+
-
Red (negative)
+CH
CONST
E
CHROMEL
CONST
E
OMEGA
+
+
Figure 2-13. 8100-201 soil temperature probe connection to Auxiliary Sensor Interface.
The 8100-202 ECH
2
O Model EC-5 soil moisture probe (Decagon Devices, Inc.,
Pullman, WA) is a 5 cm (2") dielectric sensor that measures volumetric water
content of the soil. The probe has a stereophone jack at its base; an adapter plug is
included (p/n 436-08586) that contains a 3-wire cable for connection to the
Auxiliary Sensor Interface.
Voltage channels 1-4 (V1-V4) can be used with the ECH
2
O soil moisture probe; the
soil probe must be set up in software. The 3-wire adapter cable has red, bare
(ground, unshielded), and white wires that are connected to V4(+), V4(-), and V
OUT 5VDC SWITCHED(+), respectively, as shown in Figure 2-14.
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