Signal Conditioner converts 4 to 20 mA to frequency.

Press Release Summary:

Offering solution for multiple channel PLC I/O systems, Model 8505 is designed to operate into common 24 V, 7 mA PLC discrete counter input. Converter provides 1-5 kHz output frequency for 4 µA per Hz resolution. Output is linear to 0.01% with accuracy of better than 0.1%. Housed in 3.78 x 1.06 x 1.65 in. plastic case with built-in DIN rail-mounting foot, device features isolated floating optocoupler that provides DC isolation from input and DC power.

Original Press Release:

Analog to Frequency Signal Conditioner Converts 4 to 20 mA to Frequency

Calex Mfg. Co., Inc. of Concord, California announces the availability of the Calex Model 8505. The 8505 analog to frequency converter offers a cost effective
solution for a single or multiple channel PLC I/O systems. Ideally suited to convert a 4 to 20 mA sensor output into a PLC frequency input.

The 8505 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 output is an isolated floating optocoupler which provides DC isolation from the input and DC power. The 8505 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. All connections are made to easily accessible screw terminals. The 8505 Series is backed by Calex's five year warranty and is UL 508 and UL 1604 compliant.

Pricing for the 8505 is $83.30/ea (100). Units are available from stock to 6 weeks. For more information, contact Calex Mfg. Co., Inc. via phone 925-687-4411 / 800-542-3355 or fax 925-687-3333. For a complete data sheet on the Model 8505 go to or email The Calex corporate address is 2401 Stanwell Drive, Concord, California 94520 USA. Calex has
manufacturing facilities in both Concord California and Tijuana Mexico.

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