
Section 7. Measurement Instructions
Parameter
& Data Type
Enter
Mult, Offset
The Mult and Offset parameters are each a constant, variable, array, or
expression by which to scale the results of the measurement.
HydraProbe (Dest, SourceVolts, ProbeType, SoilType)
The HydraProbe instruction is used to measure the Stevens Vitel Hydra Probe
sensor.
Parameter
& Data Type
Enter
Dest
Array
The variable array that will hold the values returned from the Hydra Probe
sensor. This variable must be dimensioned to 11. The sensor returns the
following measurements: soil type (1 = sand, 2 = silt, 3 = clay), real dielectric
constant, imagined dielectric constant, temperature, real dielectric constant with
temperature correction, imagined dielectric constant with temperature correction,
water content (fraction by volume), salinity (grams of NaCl per liter), soil
conductivity (S/m), soil conductivity with temperature correction (S/m), soil
water conductivity with temperature correction (S/m).
SourceVolts
Array
The variable array that will hold the voltages returned by the sensor (V1, V2,
V3, and V4). This variable must be dimensioned to 4.
ProbeType
A code identifying which version of the Hydra Probe is being measured.
Code Description
0 Standard Probe (5V output for V4)
Constant
1 Probe Type A (2.5 V output for V4)
SoilType
A code to indicate the type of soil
Code Description
1 Sand
Constant
2 Silt
3 Clay
SlowAntenna
See CS110 manual.
Therm107 (Dest, Reps, SEChan, ExChan, SettlingTime, Integ, Mult, Offset)
Therm108 (Dest, Reps, SEChan, ExChan, SettlingTime, Integ, Mult, Offset)
Therm109 (Dest, Reps, SEChan, ExChan, SettlingTime, Integ, Mult, Offset)
The Therm107, Therm108, and Therm109 instructions are used to measure the
107, 108, and109 thermistors, respectively.
The syntax for all three instructions is the same.
The instruction makes a half bridge voltage measurement and processes the
results using the Steinhart-Hart calculation. The output is temperature in
degrees C.
7-25
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