The Benefits of Choosing HART Communication Protocol in a melt Pressure Transmitter

What is HART™ Communication Protocol and what are the benefits of HART when buying an HPT sensor?  Developed in the mid-1980’s, HART is an acronym for Highway Addressable Remote Transducer, and it enabled users to communicate over legacy 4-20 mA analog instrumentation.   The benefits of choosing HART are Digital Capability, Analog Capability, Interoperability, & Availability.
Digital Capability allows access to all instrument parameters and diagnostics.  Two common instrument parameters accessed are Upper Range Value (URV) and Lower Range Value (LRV).  These values can be adjusted via HART handheld device to reflect accurate pressure reading at 4 mA.   Example:  if there is a 15 psig shift during start-up, a user can adjust the LRV so at 15 psig, the output will be 4 mA and span isn’t affected.  It also allows the user to ‘turn down’ the pressure range.  If a user has a 0-5000 psig sensor, they can adjust or turn down the URV to get closer to the actual pressure that the sensor will be seeing (more to follow on accuracy).  It also allows for diagnostics of the sensors via failsafe conditions, which alert users that there could be a potential problem .   
 
Analog Compatibility allows for simultaneous analog and digital communication. HART can be used with a variety of sensors and devices. It allows for diagnostics of the sensors via failsafe conditions, which alert users that there could be a potential problem HART protocol is field proven and has an install base in the millions.  Interoperability is that HART protocol is the industry standard and can be used with a variety of sensors and devices because of its common command and data structure.