May 10, 2011 ― Phidgets releases 3060 USB Isolator to protects a PC from harmful voltage (up to 1kV) that can flow from devices attached through the USB cable. The USB Isolator is also extremely useful for increasing the stability of systems using external power supplies, thermocouples, and pH sensors.
Take, for example, a PH Sensor in an electrically “active” tank. Even the presence of insulated electrical motors in the solution will affect the water. If the PH measurement electronics are allowed to float with the voltage of the water by isolating them from the USB host ground, measurements can still be taken. If they are not isolated, the weak short circuit between the water and the USB host will easily override the subtle PH signals being measured.
Price is $58.25 Canadian.