HART protocol is a vendor-neutral communication protocol used by many modern process plant equipment including Combustible Gas detectors, Flame detectors, Temperature, Pressure, Level and Flow Transmitters, etc.
HART stands for Highway Addressable Remote Transducer.
This communication foundation enables safety instruments to communicate their diagnostic information and other information such as remote calibration, clock setting, selection of calibration gas, operational history (such as installed date, current detection gas type, alarm history, fault data, temperature extremes faced, etc).
This communication foundation enables safety instruments to communicate their diagnostic information and other information such as remote calibration, clock setting, selection of calibration gas, operational history (such as installed date, current detection gas type, alarm history, fault data, temperature extremes faced, etc).
HART is a master slave arrangement where slave devices (field instruments such as detectors, process transmitters, actuators, controllers, etc) respond to the commands send by master devices such as a PLC controller or a PC.
A major aspect of HART is that HART devices can transmit digital signals on the same two wires used for typical analog communication (typically 4 -20 mA signal). This allows easy retrofitting of existing systems with HART enabled devices.
Alternative field digital communication protocols such as Modbus, and Fieldbus, etc. exists.
One major advantage related to safety critical devices using HART is that HART communication allows continuous monitoring of diagnostic state of a field device. If a device become faulty, it can be immediately recognized by the monitoring system.
Continuous Fault Monitoring can enhance the Safety Integrity Level (SIL) of safety critical systems such as Emergency Shut Down SYSTEMS, Fire and Gas Systems, etc.
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| Picture shows a HART enabled Flame Detector |
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