FAC0420-01
4–20 mA Current Sensor
The 4–20 mA Current Sensor from Fidar Electronics reads the standard 4–20 mA output of any industrial transmitter and maps it back to engineering units. It connects to a FIDAQUIRE data logger over a daisy-chained CANopen bus.
Standard 4–20 mA input
Works with any industrial 4–20 mA transmitter
Broken-wire detection below 4 mA
RJ45 output on a CANopen bus
Daisy-chains up to 64 sensors per card
Works with the FBC0232-01 card and FIDAQUIRE logger
Up to 500 m of bus at 125 kbit/s
Power and data share one cable
The 4–20 mA loop is the common language of industrial transmitters: pressure, level, flow, temperature, humidity, pH and dozens of other quantities all travel on it. This sensor reads any 4–20 mA transmitter into the Fidar monitoring chain, with the mA-to-engineering-unit mapping configured in software. The standard's real advantage is that true zero sits at 4 mA: anything below it means a broken wire or a dead transmitter, so the fault announces itself instead of failing silently.
Key features
Standard 4–20 mA input
Works with any industrial 4–20 mA transmitter
Broken-wire detection below 4 mA
RJ45 output on a CANopen bus
Daisy-chains up to 64 sensors per card
Works with the FBC0232-01 card and FIDAQUIRE logger
Up to 500 m of bus at 125 kbit/s
Power and data share one cable
Connectivity
RJ45 CANopen output running at 125 kbit/s
Daisy-chain of up to 64 sensors on one FBC0232-01 card
Automatic input-break detection reported to the logger
Where it is used
Reading pressure, level, flow and temperature transmitters
Tank and pipeline monitoring in oil, gas and petrochemicals
Bringing environmental analysers into a monitoring system
Pumping stations and water/wastewater treatment plants
Retrofitting legacy instruments into a modern monitoring stack
Air-quality and emission-measurement systems
Installation
Run the loop in shielded twisted pair and earth the shield at one end only, so you do not create a ground loop.
