Martens Martens Isolating Signal Converter, TV500L-1-0-0-5, 0 to 20mA Isolating signal converter TV500L can be used to isolate and convert unipolar or bipolar field signals into industry standard unipolar 0/4..20 mA and 0/2..10 V DC or bipolar signals for process... Quick view Qty in Cart: 0 Price: Log in for pricing and quote Subtotal: