The Model 42A controller can control up to three pumps with 4-20 mA input or two pumps with 4-20 mA input and backup floats. Four alarm inputs and one alarm output relay are provided. The graphic display shows current depth and liquid level with set points. Alternation functions are built-in and 4-20 mA inputs/output are scalable. Serial communications are standard via RS-232 or RS-485.