IsoPAQ-161P Compact Line Isolation Transmitter for Bipolar and Unipolar mA/V Signals with Fixed Range The Isolation Transmitter IsoPAQ-161P is mainly used for isolation of bipolar signals, such as ±20 mA, ±10 mA, ±10 V, ±5 V, and conversion into unipolar output signals. For applications where normally one signal combination only is used, IsoPAQ-161P offers a cost-effective alternative. The high reliability and the Protective Separation are further features, which ensure a safe system operation.