Foxboro KL2101X1-BA1 Dry Contact I/O Card for Hazardous Areas By wayne No Comments on Foxboro KL2101X1-BA1 Dry Contact I/O Card for Hazardous Areas 2 Min Read Buy the Foxboro KL2101X1-BA1 I/O card. This dry contact CHARM operates at 24 VDC field circuit with hazardous area certifications for Zone 2.