Arc Wi Bluetooth AdaptersArc Wi Wireless Adapters add Bluetooth wireless communication to an existing Arc or ECS sensor. The transparent cover provides visual indication of sensor status by changing color in the event of warnings or critical errors occurring with the sensor. Choose the Arc Wi 1G BT Adapter for ECS sensors or for direct Modbus communication to the bioreactor or controller. Choose the Arc Wi 2G BT Adapter for Arc sensors where the 4 20mA signal will be used for