BLT100 level transmitter is a float level transmitter. The operating principle is based on a consecutive switching of the cascaded reed switches by the special magnetic float, moving alongside a protective tube. The reed switches act on the elements of a resistor matrix, changing the total matrix resistance in linear proportionality with the measuring level. The BLT100 provides a 2-wire 4 to 20 mA.output signal with 6 or 12mm level resolution. An integrated loop-powered programmable LCD indicator is also available.