I know NOTHING about that CA device, but a SHUNT is a physical, electronic, very-low RESISTANCE device that covers the CURRENT passing thru it into a specific VOLTAGE signal.
The ratio, or scaling coefficient, "X", is simply:
VOLTS(out) = X/AMPS(in)
Ask the selling vendor what shunt(s) the CA is designed to work with...it will probably be a number like "millivolts-per-amp"...the scaling coefficient, X, above.
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