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Data EMI Filters for 4...20 mA Loops

Long data lines from and to 4...20mA loop sensors and actuators "collect" plenty of noise which causes data misreading, errors and other malfunction.  OnFILTER' data electromagnetic interference filters for such analog lines block EMI on long cables while providing pass through for the data.  Such filters (also called signal conditioners) improve accuracy of measurements and reduce false actuation. 

We offer two models - for slow-changing signals (under 500 Hz), such as temperature, level, and pressure sensors; and for fast-changing signals (under 10 kHz).  The former provides the best noise suppression while the latter accommodates wider variety of sensors and actuators with faster data rate, such as HART (highway addressable remote transducer) protocol. 

Data filters are easy to install and connect.  They are completely passive, transparent for data, and require no power.

Chassis Mounted Data Filters
Dual DIN Rail Mounted Data Filters
Data EMI filters for 4...20 mA loops
Data EMI filter connections with sensor
Connections From Sensors

These filters qualify for UL508A panels by being  low voltage, low energy devices


Up to 500 Hz Data Rate

DF420CD1 Attenuation.png


Up to 10 kHz Data Rate

DF420CD2 Attenuation.png

Typical Filter Attenuation Data

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