Apple iOS Software Reference (Single Chamber Mode)
9-29
IRGA Volume: Volume of air (cm
3
) in the optical bench and associated tubing
inside the Analyzer Control Unit case. In most cases this number should not be
changed.
Auxiliary Inputs
The Auxiliary Inputs page is the area in which you can input the coefficients for
linear external devices connected to the Auxiliary Sensor Interface. There are four
dedicated thermocouple channels (Type E, J, T, or Raw), and four general voltage
input channels (0-5VDC); any of the four voltage channels can be used for general
purpose voltage inputs, thermocouples, or the Decagon ECH
2
O or Delta-T Theta
soil moisture probes. When configured for a soil moisture probe, the probe is
powered for 10 seconds to allow it to stabilize, and is then sampled.
Tap on the Thermocouple type to
choose the type of thermocouple
connected to the Auxiliary Sensor
Interface.
Tap on the Volt 1-4 fields to choose the type of device connected to the associated
voltage channels. The coefficients will change to reflect the type of device
connected. For General Purpose (GP) and Soil Moisture (SM) probes, the slope and
offset values (obtained from the manufacturer) are entered. Thermocouples
(Therm) require you to enter three calibration coefficients (obtained from the
manufacturer).
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