Section IV – Diagrams
Figure 13. Analog Inputs; Resistance (RTD) / 4-20ma
wired with another twisted pair.
1. 100 Ω @ 0 Degrees Celsius.
Ω / Ω /
The 4-20mA input is not isolated from the processor and main power (CN9-2 is electrically connected to “common”).
The 4-20mA input can be programmed for the function required by the application. The analog inputs are also scaleable
18 to 24 gauge.
Note: Due to the fact that the common for the 4-20mA input on the microLoad is not isolated, you cannot connect it in series with another microLoad
to share the 4-20mA output signal from a single device (i.e. temperature probe, density, pressure transducer). The reason for this is that if the com-
mons for the 4-20mA inputs on the separate microLoads have the same potential and are connected in series, one of the inputs will be by passed
and cause it to produce a zero reading. This would then give an appearance that the second 4-20mA input in the series circuit was defective.
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