Calex developed its model 8505 analog to frequency converter for single or multiple channel PLC I/O systems. This converter is ideal to convert a 4 to 20 mA sensor output into a PLC frequency input. It is designed to operate into the common 24 volt, 7 mA PLC discrete counter input. It provides 1 kHz to 5 kHz output frequency for a 4 µA per Hertz resolution. The output is linear to 0.01% with a very high accuracy of better than 0.1%. The converter is housed in a plastic case with a built in DIN Rail mounting foot. The case dimensions are 3.78”L x 1.06”W x 1.65” H.