HART Protocol

Save money on capturing Process Information using HART!!

Modern electronic process transmitters can provide more than just 4 – 20mA control signals.

The HART Protocol provides two simultaneous communication channels: the 4-20mA analog signal and a digital signal.

The 4-20mA signal communicates the primary measured value (in the case of a field instrument) using the 4-20mA current loop - the fastest and most reliable industry standard. Additional device information is communicated using a digital signal that is superimposed on the analog signal.

Why not take full advantage of their capabilities to provide process information and save on the cost of additional transmitters.

In a recent project we saved our Client about 30% on the cost of meeting his process information requirements by eliminating the need for additional transmitters.

For example, where it is necessary to control process mass flow a modern mass flow transmitter will provide a 4 – 20mA Analogue signal but in addition, can provide digital signals for temperature, density and totalised flow. All that is needed is an analogue processor with HART capability to convert the digital signals to provide indication of other process information. including device status, diagnostics, additional measured or calculated values, etc. Together, the two communication channels provide a low-cost and very robust complete field communication solution that is easy to use and configure .

HART based instruments significantly reduces the time to fully commission a network or loop. Standard features such as Device Set-up, Device verification, loop integrity check and “as installed record keeping”, useful when replacing instruments are all time and cost saving tools. All these functions can be accessed remotely via network.