4-20 mA


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

4-20 mA

(4 to 20 MilliAmp) A point-to-point or multi-drop circuit mainly used in the process automation field to transmit signals from instruments and sensors in the field to a controller. It sends an analog signal from 4 to 20 mA that represents 0 to 100% of some process variable. As a current loop signal, 4-20 mA also powers the sensor transmitter on the same wire pair, and 4-20mA provides more resistance to interference than a voltage-based line. See HART.
References in periodicals archive ?
system of wireless test tools: the Fluke a3003 FC Wireless DC Current Clamp and the a3004 FC Wireless DC 4-20 mA Current Clamp.
PT4624-A amplified-output pressure transmitter produces a 4-20 mA signal for long-distance transmission without noise interference and easier interfacing with PLCs or extruder control systems.
The transmitter connects directly to a 3-wire RTD probe, and conditions and linearizes across a dedicated temperature range providing a standard 4-20 mA current output.
Designed to work with zirconia-based oxygen sensors, the VersaPro automatically converts the raw sensor readings of oxygen concentration and temperature into industry-standard 4-20 mA signals.
The BlueLynx system transmitter module can connect to a dynamic sensor, such as an accelerometer, or up to four standard 4-20 mA sensors.
Easily integrated into existing and new process systems, Type 8205 features a 4-20 mA output signal for process pH value, two pulse outputs.
Digital communication, or a 4-20 mA signal, can be used to connect Massflo to the control and monitoring system.
Our newest DACs provide a compact and intelligently integrated solution for 4-20 mA transmitters and analog I/O systems, meeting the growing demand for feature-rich, highly reliable programmable automation controllers," said Mike Britchfield, product line director, Precision Data Converters, Analog Devices.
1 Ms/Cm Temp Compensation: Automatic Operating Temp : -20 Deg C To 55 Deg C Local Indication : Required Output : 4-20 Ma Protection : Ip 65
Customers can choose from Digital, 4-20 mA, or 0-10 V I/O Modules to create a customized solution that is both cost-effective and high-performing.
The SmartBob AO level sensor features an integrated 4-20 mA analog output to a PLC for monitoring bin level measurement data.
The range 4-20 mA is equivalent to 0-100% LEL, already linearized and calibrated.