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在要求转换器的电流高于4-20mA时，使用3线传送器XRT1
消耗积分:5 |
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大小:21 |
2009-06-13
张国厚
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If you need more transducer excitation current than is available
on a standard 4-20mA 2-wire current loop, consider a 3-
wire transmitter. A 2-wire 4-20mA transmitter uses the same
two wires for signal and power. Part of the 4mA minimum
loop current is used to power the transmitter circuitry. The
remaining current can be used for transducer excitation. In
some applications even the entire 4mA is not enough for
transducer excitation.
on a standard 4-20mA 2-wire current loop, consider a 3-
wire transmitter. A 2-wire 4-20mA transmitter uses the same
two wires for signal and power. Part of the 4mA minimum
loop current is used to power the transmitter circuitry. The
remaining current can be used for transducer excitation. In
some applications even the entire 4mA is not enough for
transducer excitation.
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