Single alarm threshold for control of analogue signals. Widely used as alarm unit in control of temperature, pressure, flow rate, level etc. The analogue input can be programmed via dip switches for all the standard signals used industrially. current 0 - 20 mA and 4 - 20 mA. voltage 0 - 5 Vdc, 1 - 5 Vdc, 0 - 10 Vdc and 2 - 10 Vdc.