An article comprising: a polymeric housing having a fluid transfer channel defined therein, wherein the housing comprises a first polymeric layer having a surface forming a side of the channel, the housing comprises a second polymeric layer having a first surface , at least a portion of the second layer first surface being bonded to the surface of the first polymeric layer , and walls of the channel are defined in the second layer; a first conductive trace at least partially coinciding with the fluid transfer channel, the first conductive trace forming at least a portion of the first layer surface ; and the polymeric housing further comprising a first access passage containing a first wire having a first conductor surrounded by a first insulating jacket , wherein the first conductor is in electrical communication with the first conductive trace, wherein a jacket bonding region of the first insulating jacket located within the first access passage is welded to a corresponding housing bonding region of the housing, and wherein the jacket bonding region and the housing bonding region are formed from a common type of polymer; wherein the first conductive trace comprises a first electrode that follows a path of the fluid transfer channel and a first extension that branches away from the path of the fluid transfer channel through the first access passage and passes across the second layer first surface, and wherein the first conductor is attached to a portion of the first extension branching from the fluid transfer channel . a polymeric housing having a fluid transfer channel defined therein, wherein the housing comprises a first polymeric layer having a surface forming a side of the channel, the housing comprises a second polymeric layer having a first surface , at least a portion of the second layer first surface being bonded to the surface of the first polymeric layer , and walls of the channel are defined in the second layer; the housing comprises a first polymeric layer having a surface forming a side of the channel, the housing comprises a second polymeric layer having a first surface , at least a portion of the second layer first surface being bonded to the surface of the first polymeric layer , and walls of the channel are defined in the second layer; a first conductive trace at least partially coinciding with the fluid transfer channel, the first conductive trace forming at least a portion of the first layer surface ; and the polymeric housing further comprising a first access passage containing a first wire having a first conductor surrounded by a first insulating jacket , wherein the first conductor is in electrical communication with the first conductive trace, wherein a jacket bonding region of the first insulating jacket located within the first access passage is welded to a corresponding housing bonding region of the housing, and wherein the jacket bonding region and the housing bonding region are formed from a common type of polymer; wherein the first conductive trace comprises a first electrode that follows a path of the fluid transfer channel and a first extension that branches away from the path of the fluid transfer channel through the first access passage and passes across the second layer first surface, and wherein the first conductor is attached to a portion of the first extension branching from the fluid transfer channel . <EOS>