SD-AY420 Level Transmitter operates according to the capacitance measurement principle. Proportional to the water level in water tanks and boilers, a standard analog signal for automation systems generate 4-20mA DC current. It provides a current of 4 mA for the set minimum level and 20 mA DC for the set maximum value. The level transmitter helps to indicate the level of the liquid in the tank or boiler both as a percentage and 4-20 mA analog signal.
There are 3 buttons which are and 2 red and 1 green LEDs on the device that are used for adjustment during commissioning.
SD-AY420 is not a stand-alone control system. However, the signals received from it will function if used properly.
It can be used in 3 different ways.
1- To command the signals coming from SD-AY 420 by using the inverter of the feedwater pump via PLC or SCADA system.
2- To command the signals coming from SD-AY 420 by using the inverter of the feedwater pump directly.
3- To command the signals coming from SD-AY 420 by using the actuated valve via PLC or SCADA system.