Pellistor input

Dear all,

I need the information regarding pellistor input. I have several drager gas detectors, at the moment they are connecting to drager regard card. I want to replace those card with a PLC I/O card.

But, the problem is they are using pellistor input. I don't know about pellistor. Is it possible to transfer those signal to the PLC using a analog input (current or voltage)?

what is the range of pellistor input?

Need your advice.

Thanks,
ariez