How we can reduce hysteresis loss in resisitive type sensors based on metal oxides?
Are you sure you are dealing with a hysteresis effect. Metal Oxide resistor values are not likely,to have a hysteresis problem even with increasiing current which then reduces. The value is typically constant unless excessive heating takes place in which case the thermal tolerance becomes important. I suggest the hysteresis is located elsewhere in the sensor.
As far as I understand you use the resistor type sensors based metal oxides in the AC. Because the hysteresis losses ocur in AC. If your circuit's frequency is high, the losses will be high. On the other hand, the reference communication value is 4-20 mA is DC, not AC. I agree with Mr. Coleman, the hysteresis is located elsewhere in the sensor.
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