APT3700N Smart Pressure Transmitter for Nuclear Service Operation Manual M3700N-K01E
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[Figure 4 Typical Wiring Using Flexible Metal Conduit]
2.4.1. Power Supply and Load Resistance
When choosing the Loop, check if the outer load resistance is within the range
of the Figure(Figure 5). Inner transmitter’s terminal voltage is
General standard
: 12 to 45Vdc and
HART communication
: 17.5 to 45 Vdc,
Transmitter's max electricity is 21.1mA so it becomes
R = (E-12) / 0.0211
Here it is R = Outer Load Resistance, E = Source Voltage.
To have HART communication, external resistance above 250 ohm is needed.
