BLP74-L is a simple and low cost digital indicator with a single 4-20 mA current input, which powers this device at the same time. Measurement input is equipped with safety circuits, saving internal electronics against overload. Device has possibilities of recalculating measured current according to few predefined transfer functions (linear, square, square root) or fully definable user characteristic (max. 20 points). Result is displayed on 4-digit red LED display, the range of the result is from -999 to 9999, with definable decimal point position. The device can be equipped with optional SPDT relay, and signalisation of its state by LED on front panel. Due to users safety reqirements this output can drive a bulb lamp as well sound signalling device but must not be used for controlling purposes. Configuration of the device can be done using IR remote controller (when input current is higher than 10 mA, what is signalised by additional LED). Remote controller is not a part of the BLP74-L and is available on request as optional equipment.