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MAS-1 Soil Moisture Sensor

3. Integrating the MAS-1

by the MAS-1 itself, there is no need to pulse the excitation

voltage. A constant supply voltage should be applied in

order for the MAS-1 to function as it is designed.

Wiring

Conventional (PLC)

A Programmable Logic Controller (PLC) is typically used to

read the current transmitted from the MAS-1. The red wire

(see Figure 2) of the MAS-1 is connected to a voltage output

terminal that is able to supply 10-32 VDC. The black wire is

connected to an input terminal that is capable of accepting a

current input ranging from 4 mA to 20 mA.

Figure 2 - Typical wiring connection

Non-Conventional

When using a device, such as a data logger, that does not

have an input capable of measuring current, a pickoff resis-

tor can be used as shown in Figure 3. Assuming that the Sin-

gle Ended Input has an input impedance, or resistance, much

larger that of R

, then all of the current in the 4-20 mA

Volt

loop passes through R

. If the data logger can measure

Volt