6.3.16 Dual 4-20mA Output Driver
Two outputs fully isolated from each other and from the mother board.
Output open loop alarm; Maximum load of 450ohm @ 21.5mA, 480 ohm @20.5mA. Drive voltage maximum; 18VDC open
circuit. We recommend a maximum length of 1,000 feet using 22 AWG wire or larger. Twisted, shielded, stranded cable is
best for long distances.
Does not have a passive output. The loop is powered by the driver card.
Scale to any engineering units, forward or backward.
Examples:
4mA = 200 GPM and 20mA = 0 GPM
4mA = -500mV and 20mA = 500mV
Can be used for proportional control of a pump or analog valve.
Can be used as a process variable to a DCS or chart recorder.
The dual 4-20mA output driver is equipped with onboard power which is used to
power or excite, the output loops. Therefore, the input device must not power the
loop. mA loops cannot be powered from two sources!
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