Non-contacting level measurement featuring a 4-20mA output (isolated or non-isolated) proportional to level and two alarm or control relays and is available with or without display. The Blackbox range includes the echo processing sophistication of DATEM. Programmed by a hand-held calibrator or from a computer, Blackbox allows engineers to select the output to suit the application. An integral keypad and display option is available for any unit in the Blackbox range except the 136 CSO. A larger enclosure is available giving more room for cable terminations from the gland entry. Units are available with an IP67- RS232 external connection.