APT3500 Smart Pressure Transmitter
Operation Manual M3500-EO1G
45 DUON System Co., Ltd.
4.7.6 Power Supply Voltage and Load Resistance
When configuring the loop, make sure that the external load resistance is within the range in the
figure below. Since the voltage of transmitter terminal input is same as follows.
Voltage Rating : 24Vdc
General Standard : 12 to 45 Vdc
Hart Communication : 17.5 to 45 Vdc
KOSHA Explosionproof : 12 to 45 Vdc
CSA Explosionproof : 17.5 to 42 Vdc max.
And maximum loop current is 24mA, Load resistance R:
R = (E-12) / 0.022 (E = Power Supply Voltage)
[Note] In case of an intrinsically safe transmitter, external load resistance includes safety barrier
resistance.